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SPECIFICATION FOR BUILDING WORKS
CIVIL WORKS
The Work shall be carried out according to these Specifications whether specifically
mentioned elsewhere or not. No extra in any form will be paid unless it is definitely stated as
an item in the Bill of Quantities.
Whenever the Specifications are not given or when the Specifications are ambiguous, the
relevant Nepal Standard or Indian Standards or British Standards and further amendments will
be considered as final and binding.
All Works shall be carried out simultaneously with electrical, plumbing, sanitary and other
services and in co-operation with the Contractors the above services. The Work shall be
carried on till it is completed satisfactorily along with the completion of other essential
services. The building Contractor shall keep the other Contractors informed of the proposed
programme of Work, well in advance, so that the building Work is not hindered. The
Contractor shall further cooperate with other Contractors in respect of any facility required by
them e.g. making holes in shuttering for sanitary, pipes, electric conduits, fan hook etc.
However, no extra payment shall be admissible to him for such reasonable assistance and
facilities afforded to other Contractors and the building Contractors shall be deemed to have
taken these factors into consideration while quoting his rates.
The Work shall be related to the drawings, which the Contractor is presumed to have studied.
Nothing extra will be paid for any item because of its shape, location or other difficult
circumstances, even if the schedule makes no distinction, as long as the item is shown in the
drawings.
The source of materials stated in the Specifications is those from which materials are generally
available. However, materials not conforming to Specifications shall be rejected even if they
come from the stated sources. The Contractor should satisfy himself that sufficient quantity of
materials of acceptable Specification is available form the stated or other sources.
The requirements of Specifications under (A) GENERAL and (B) MATERIALS shall be
fulfilled by the Contractor without extra charges i.e. the item rates quoted shall be deemed to have
taken these Specifications into account.
GENERAL:
1.
Office accommodation and WC:
The Contractor shall provide at his own expense adequate temporary accommodation and
toilet facilities for his Workmen and keep the same in good conditions. This may be done to
suit Site conditions with the approval of Project Engineer. The above mentioned temporary
structures shall be removed on the completion of Works at Contractor's own cost. All
materials shall belong to the Contractor.
2.
Boards:
A board of size approximately 1.5m x 1.0m shall be made and put at an approved place on the
Site. This board shall be painted in approved colour with names of (a) The proposed construction
and Owner (b) The Contractor (c) Consultant. This shall be provided by Contractor at his own
expense.
3.
Drawing, Instructions, Measurements:
All the Work shall be done according to the drawings and instructions of the Project Engineer and
the Contractor shall arrange to test materials and/or portions of the Work at his own cost in order
to prove their soundness and sufficiency. If after any such test, and in the opinion of the Project
Engineer, any Work or position of Work is found to be defective or unsound, the Contractor shall
pull down or re-execute the same at his own cost. Such rejected materials shall be removed from
the Site immediately.
4.
Preparing and cleaning the Site:
The Site described and shown on the plans plus 6 M (20ft.) all around the building shall be
cleared of all obstructions, loose stones and materials, rubbish of all kinds as well as brushwood.
All holes or hollows whether originally existing or produced by removal of loose stone or
brushwood shall be carefully filled up with earth, well rammed and levelled off as directed. Also
the Contractor shall dress the Site 6 M (20ft.) all around the buildings after completions,
maximum cutting or filling being 30cm (12 inches). This shall be as per bill of Quantities.
5.
Trees:
No trees, saplings shall be removed/cut without prior permission of the Project Engineer. If any
tree has to be cut, this shall form an extra item. For the purpose of the Specification, a tree shall be
defined as growth whose circumference of the trunk at 30cm (1'-0") from the base is not less than
90cm (3'-0") in height.
6.
Measuring Materials:
Materials requiring measuring shall be measured separately in boxes of appropriate sizes before
being mixed as directed by Project Engineer.
7.
Temporary Protections:
All trenches, walls newly laid concrete or other Work requiring protection from weather or
accidental injury shall be protected by means of tarpaulin or in any other way so as to keep the
Work safe from damage. Nothing extra shall be paid for on this matter.
8.
Quality of Work:
Materials, tools and plants, and Workmanship shall be the best of several kinds obtainable in the
market and as approved by the Project Engineer.
9.
Leave clean:
On completion, all Work must be cleaned down, rubbish removed and the Works and land cleared
of rubbish, surplus materials, debris and other accumulations and everything left in a clean and
orderly conditions.
10.
Samples:
Samples of each class of Work required and materials shall be submitted by the Contractor for
the approval of the Project Engineer and after such approval, these samples shall be deposited
at a place chosen by the Project Engineer. The Contractor will be required to perform all Work
under the Agreement in accordance with these approved samples.
11.
Provisional Items:
All provisional Work items in the schedule shall be carried out at the discretion of the Project
Engineer, and may or may not form part of the Agreement. If such provisional items are carried
out by the Contractor, the rates shall be settled as for extra items as stated in the conditions of
Agreement.
12.
Storage:
Safe, dry and proper storage shall be provided for all materials, particularly cement. For installed
at the Site of Work the Project Engineer may reduce the capacity of storage.
13.
Water:
Water shall be clean and free from oil, waste, acid or other organic matter in solution or
suspension. Water shall be from municipal main or tank or well water. Storage for the water shall
be of sufficient size and as directed by the Project Engineer. The Contractor shall make his own
arrangements for water supply.
14.
Earth:
Earth for filling and terracing shall be free from all rubbish, organic or vegetable growth including
roots, weeds etc. All clods shall be first broken-down.
15.
Sand:
Sand shall be clean from river and of approved quality and free from salt, earth, dust or other
impurities. If required by the Project Engineer, it shall be washed with clean water and not more
than 5% of fine materials (clay, dust and silt) will be allowed, as tested by the settlement in water.
The sand may contain particle size up to 5mm and should be well graded. Coarse sand for
concrete Work shall be from local rivers or from any other place as approved by the Project
Engineer and shall conform to cement concrete specification.
16.
Portland Cement:
N.S. or I.S. mark awarded Ordinary Portland Cement should be used. Cement shall of fine quality
with its chemical composition, consistency, tensile and compressive strength, soundness, setting
time according to I.S. It should be free from lumps. It should be stored in a weatherproof building
on a floor at least 30cm high from floor level. It should be stacked 60cm clear from the walls, and
stored in such manner that permits easy access for inspection. It should also be stacked in not
more than 6 layers high to prevent bursting of bottom bags. The Project Engineer may order
testing of cement if required. In no case cement of grade less than 43 shall be used.
17.
Stone:
Stone for rubble masonry shall be of the best of its kind. It shall be strong, angular, and free from
flakes and must be of quality approved by the Project Engineer. No earthy or discoloured, weather
or water worn stone shall be used.
18.
Cement Mortar:
Cement mortar shall be of proportions specified for each type of Work. It shall be composed of
Portland Cement and Sand. The ingredients shall be accurately gauged by measure and shall be
well and evenly mixed together; care being taken not to add more water than is required. No
mortar that has begun to set shall be used. If hand mixing is allowed then it shall be done in brick
tanks. The gauged materials shall be put in the tank and mixed dry. Water will then be added and
the whole mixed again until it is homogeneous and of uniform colour. Required quantity of
cement shall be mixed at one time and shall not be such as to exceed mortar amount that can be
consumed within 30 minutes of its mixing.
19.
Aggregate:
Aggregate shall be from hard stone of size as specified under item of Work. In general 30mm
(1.25") maximum gauge aggregate shall be used for mass concrete in foundation and 19mm
(3/4") and down gauge i.e. 13mm (1/2”) in average, graded aggregate broken from stone
crusher or pebbles for RCC Work. The Project Engineer shall approve the quality of the
aggregate and if not shall be deported from the Site. The aggregate shall be brought to the Site
from same approved quarry and crusher, in any condition if Contractor wants to change the
quarry, the further approval shall require. In general, the other specification relating to
aggregate shall follow standard practice of Department of Urban Development and Building
Construction.
20.
Bricks:
All bricks shall be of first class quality, approved by the Project Engineer. The bricks shall be free
from grit and other impurities such as lime, iron and other deleterious salts, well burnt, copper
coloured, sound, hard, square with sharp edges and shall give ringing sound when struck with a
mallet. Machine made bricks shall be of best quality. Chimney made local bricks shall be of first
class quality available, satisfying above-mentioned properties. Every lot the quality of the bricks
shall be checked by the Project Engineer to ensure the quality of it.
21.
Telia Bricks:
Telia bricks or tiles shall be of first class quality, having smooth, hard surface, regular in shape,
sizes and uniform thickness and good colour. The tiles should be thoroughly burnt having sharp
and square edges. They should be free from cracks, flaws and chips. They shall show a fine
grained, dense texture and be free from lumps of lime, lamination, cracks, air holes, soluble salts,
causing efflorescence or other defects which may in any way impair their strength, durability,
appearance and usefulness for the purpose intended. They shall not have any part under-burnt.
They shall give a clear, metallic ringing sound when struck. All tiles shall have to be approved by
the Project Engineer. Any tile not found up to the Specification shall be removed from the Site
immediately at Contractor's own cost, representative samples of tiles to be used shall be submitted
to the Project Engineer and his approval should be taken before bulk purchase. All tiles supplied
shall confirm to the approved samples in all respect.
22.
Steel:
The reinforcement shall be cold twisted deformed steel or TMT as per schedule, as approved by
the Project Engineer. The reinforcement shall be free from fillings, loose rust, mill scale, paint,
oil, grease, adhering earth or any other material that, in the opinion of the Project Engineer may
impair the bond between the concrete and the reinforcement or that causes corrosion of the
reinforcement or disintegration of the concrete.
Test certificates may be required from the suppliers, and in addition, the Contractor must
undertake tensile and bending tests on random samples of the reinforcement delivered to the
Site. All steel, which is represented by a sample, which fails to reach the minimum
requirements as per standard code of practice is to be removed from the Site immediately.
23.
Terrazzo Tile:
Terrazzo tile shall be of smooth surface, durable and of sizes and colours as per schedule. The
sample should be approved by the Project Engineer before commencement of flooring work.
24.
Scaffolding:
Scaffolding shall consist of well seasoned Sal wood planks or water proof plywood or steel plate
with necessary battens, planks and metal props with accessories. All the scaffolding members
shall be checked before installation for their strength and stiffness and tied up properly. It shall be
fixed and tied together. In case of finished Work such as plastering, painting and distempering, no
part of the scaffolding should touch the structure. Where ladders are used, gunny bags shall be
tied up at the ends to prevent any damage to Work by sliding or tipping.
25.
Timber:
Sal wood shall be used in general if other wise specified and shall be of the best quality available,
perfectly dry, free from knots, cracks, shakes other defects and any appearance of rot.
26.
Special Material:
If materials of a particular brand are specified in the Bill of Quantities, these shall be produced
accordingly from the particular manufacture. These shall include materials such as bricks, tiles,
bitumen and bituminous compounds, water proofing compounds, hardening compounds, special
paints, acoustic and insulating boards and other finishing materials of approved makes. The
responsibility for the use of these materials lies with the Contractor and he should avail himself of
necessary guarantees from the manufacturer. Such guarantees as may be required by the Project
Engineer shall be obtained by the Contractor and given to the Project Engineer. Specific brand
names have been avoided, wherever possible. Where brand names have been used, they have
been used merely to describe the nature of the desired materials and not used to endorse or
indicate an preference for a particular product or manufacturer. Goods which have similar
characteristics and provide performance and quality at least equal to those specified and
conforming to IS standards are acceptable.
27.
Test of Materials:
The Contractor shall at his own cost arrange and carry out the tests of materials to be used in the
Works or any other tests as deemed necessary by the Project Engineer.
Work items:
1.
EARTHWORK IN EXCAVATION IN FOUNDATION:
The Contractor shall examine the Site and ascertain for himself the nature thereof and the types of
materials to be excavated.
1.1.
Earthwork in excavation in the site development:
Due to uneven topography of the Site, the levelled ground shall be prepared with the formation
level as indicated in the drawings or to such lesser or greater extent as the Project Engineer may
advice. Excavated earth shall or shall not be placed within the premises of the project boundary.
The Project Engineer may direct the Contractor to place excavated earth at particular filling area
or to be dispose off.
The side slope in the excavated area must be maintained in the ratio of 2 Horizontal is to 1 vertical
or as per drawing and must be 3 meter away from the edge of building.
1.2.
Earthwork in Excavation in Foundation:
Foundation trench shall be due to the exact width and depth and levels as indicated in the
drawings or to such lesser or greater extent as the Project Engineer may advice. Sides of trenches
shall be vertical. In case the soil does not permit vertical sides, the Contractor shall protect side
with timber shoring. Excavated earth shall not be placed within 1.5 meter of the edge of the
trench. The Project Engineer may direct the Contractor to place excavated earth at a particular Site
up to 30 meter away from the building. The bottom of the trench shall be perfectly levelled both
longitudinally and transversely. The bed shall be lightly watered and well-rammed with
mechanical vibrator. Excess digging if done through mistake shall be filled with 1:4:8 concrete.
Water, if any accumulated in the trench, shall be baled out and all necessary precaution taken to
prevent surface water from entering the trench.
Soft and defective spot in the trench shall be dug out and removed and filled with concrete or
materials prescribed by the Project Engineer. If rocks or boulders are found during excavation,
they should be removed and the bed trench shall be levelled and made hard by consolidating the
earth, at no extra cost. Above mentioned items or any variation thereof from the Bills of
Quantities shall be measured and valued by the Engineer as a variation. After the completion of
foundation masonry, the remaining portion of the trench not filled by masonry shall be filled up
with earth in layers of 15cm, watered and well-rammed. Such filling shall be free from rubbish,
refuse matters and clods, surplus earth, if any shall be removed and site shall be levelled and
dressed.
Trenches shall be measured as per drawings and rate shall be for complete Work including
trench filling, for 30 meter lead and 1.5 meter lift including all tools and plants required for the
completion of the work, removal of boulders, side shoring, pumping, and filling in voids by mass
concrete (1:4:8) under (4) above etc.
No excavation or foundation work shall be filled in or covered up before the inspection and
approval of the Project Engineer. The starting level for excavation shall be deemed to be ground
level or such level as may be specified by the Project Engineer, before the commencement of the
Work.
2.
CONCRETE WORKS:
2.1
Code of Practice for Reinforced Concrete Work:
All Workmanship, materials and tests in connection with reinforced concrete Work are to be in
conformity with Code of Practice where not inconsistent with these preambles. Generally a
competent person shall be employed whose first duty will be to supervise all stages in the
preparation and placing of concrete. All cubes shall be made and Site tests carried out under his
direct supervision.
All materials, which have been damaged, contaminated or have deteriorated, or which do not
comply in any way with the requirements of the Specification shall be rejected and shall be
immediately removed from the Site. No materials shall be stored or stacked on suspended floors
without the Project Engineer's prior approval. Sample of all materials may be asked to submit for
approval of the Project Engineer. All condemned materials are to be removed from the Site within
24 hours.
Any cement which has failed the tests or which has been damaged by water or contaminated in
any way on the Site shall immediately be put into bags and removed from the Site.
Fine aggregates and sand shall be clean, coarse, hard siliceous material and equal at all times to
the samples which shall be deposited with and approved by the Project Engineer.
The caustic soda tests for organic impurities shall show a colour not deeper than of the standard
solution. The setting test for natural sand shall be made as per standard code of practices. The
Contractor shall supply all necessary equipment for the testing of fine aggregates and sand for the
use of the Project Engineer.
Coarse aggregates shall be hard, clean gravel or broken stone from approved quarries or other
similar approved materials and shall be free from earth, decomposed stone and extraneous matter.
They shall be "Graded Aggregate" and either 25mm to 5mm or 12mm to 5mm unless otherwise
specified. Thin, elongated, friable, flaky or laminated pieces, mica or shale shall only be present in
such small quantities as not to affect adversely the strength and durability of the concrete.
The amount of fine particles occurring in a free state or as loose adherent shall not exceed 1%
when determined by the laboratory sedimentation test. After twenty four hours in water, a
previously dried sample shall not gain more than 10% in weight.
3.4 Aggregates Storage:
Each grade of aggregate shall be stored on the Works in separate heaps so that there shall be no
possibility of any inter-mixing. Any materials which have become inter-mixed shall be removed
from the Site forth with by the Contractor. The materials shall be stored on a timber or concrete
floor and the piles shall be as large as possible, flat topped and drained.
3.5 Proportion of Concrete Mix:
The quantity of cement shall be measured by Volume and each batch of concrete is to use one or
more whole bags. The quantity of fine aggregate and coarse aggregate shall be measured
separately by volume or in approved weight-batching plant. The volume of damp aggregate must
be adjusted to take into account the weight of water in the aggregates, and this in turn will affect
the amount of water to be added into the mix. The Grade of concrete should confirm the
respective strength as specified in the codes not the proportions of cement sand and aggregates.
3.6 Proportion of Fine Aggregate to Coarse Aggregate:
Generally 1:2 proportion of fine aggregate to coarse aggregate by volume but subject to an upper
limit of 1:1.5 and lower limit of 1:3. The proportion of the aggregates should be adjusted to obtain
suitable results.
3.7 Grades of the Concrete:
Plain and reinforced concrete shall be in four grades designated as M 100, M 150, M 200 and M
250.
3.8 Strength Requirement of Concrete:
N.S. mark awarded Ordinary Portland cement conforming to the accepted standards shall be used.
The compressive strength requirements for the various grades of concrete shall be as specified
bellow.
3.9 Concrete Test:
Preliminary
The Contractor on its own cost shall conduct the test in a laboratory on the trial mix of the
concrete in the satisfaction of Project Engineer's representative in the laboratory with the object of
a.
b.
c.
Designing the concrete mix one month before the actual concreting operation starts,
Determining the adjustment required in the designed mix when there is change in the materials
used during the execution of the Work, or
Verifying the strength of the concrete mix.
Works Test
The Contractor on its own cost shall conduct a test either in the field or in the laboratory in the
satisfaction of the Project Engineer of the specimens made on the Works. Throughout the carrying
out the term of the Agreement, "Works Cube Tests are to be made from concrete drawn from
newly laid concrete or concrete about to be placed in position, such cubes being made in the
presence and guidance of the Project Engineer. Such cubes shall be made in 15cm cube steel or
cast iron moulds and shall be marked and cured strictly in accordance with appendices of the code
of practice, and shall be forwarded carriage paid in time for testing at the required age to a testing
laboratory to be nominated by the Project Engineer. Four cubes shall be made on each occasion,
concrete for each cube being from a different batch. Two cubes shall be forwarded in time for
testing at the age of 7 days. Each cube shall be marked with the date of casting and a distinctive
reference number in accordance with a system agreed by the Project Engineer. A record shall be
kept of the position from which the concrete for each set of cubes was drawn, or to which it was
about to be placed.
At least three sets of four cubes shall be cast during each week when concrete is being cast,
including sets of cubes for each quality of concrete used during the period.
Concrete is required to have the properties and give the strength in Kg. per square cm as set out in
the Table below, which is to be considered as the minimum standard that will be accepted in the
finished Works.
Tables
Grade of
Concrete
Quantity of cement : sand and aggregate required for 1 cu.m of Concrete
Aggregate Size
Minimum Crushing
Strength in Kg/cm2
7 days
28 days
Cement
Sand
M 150
0.32 MT
0.445 M3
0.11 M3
0.22 M3
0.52 M3
105
150
M 200
0.40 MT
0.425 M3
0.29 M3
0.57 M3
X
140
200
M 250
0.61 MT
0.425 M3
0.21 M3
0.64 M3
X
175
250
10 mm
20 mm
40 mm
The maximum mica content to give the minimum strengths specified in the table will be
determined by means of trail mixes before the commencement of the concreting Works. The
aggregates delivered to the Site during the execution of the Works will be tested for mica content
in accordance with standard tests. Fine Aggregates and sand if found to have mica content in
excess of the maximum permissible quantity they will be rejected and shall be removed from the
Site at the Contractor's expense. Alternatively, the Contractor may at his own cost, increase the
cement content up to a maximum of 10% above the nominal mix specified in the above table in
order to achieve the specified strengths, except that no such concrete shall be placed before
satisfactory 28 days cude tests have been obtained for that particular mix.
3.10
Unsatisfactory Concrete Work:
Should, in the opinion of the Project Engineer any of the results of the specified tests of concrete
or materials be unsatisfactory, the Project Engineer may order the Work to be stopped pending
their further instructions. Executed Work for which test results are unsatisfactory shall be liable to
rejection and, if so directed by the Project Engineer, the Work represented by the tests shall be cut
out and re-execute at the Contractor's expense.
In the case of 7 days Works cube tests proving unsatisfactory; the Work may be stopped, but shall
not be liable to rejection until the results of the 28 days tests are known. In the event of the results
of the 28 days Works cube tests proving unsatisfactory, the Work represented shall be
immediately liable to rejection.
Should the average strength of these specimens attain the specified minimum 28 days strength,
the Work will, subject to the Project Engineer's discretion, be accepted. Alternatively, the Project
Engineer may instruct the Contractor to make a loading test as described hereinafter. The cost of
all such preparation, testing and making good the portions of the structure affected, shall be borne
by the Contractor. The cost of all delays on Site due to concrete not attaining the desired strength,
or caused by investigation of defects, cutting away and making good, shall be entirely the
Contractor's responsibility.
3.11
Structural Test:
If, in the Project Engineer opinion, there is a doubt as to the strength of a structure, solely or in
part, for the reason that the Site-made concrete cubes fail to attain the specified strength, or
because of one or more circumstances attributable to alleged negligence on the part of the
Contractor, then the Project Engineer shall instruct the Contractor to make a loading test on the
Works or any part thereof. If the results of the test is satisfactory, except where the test has been
made because test cubes fail, the Contractor shall be reimbursed for the cost of the test. If the
result of the test is not satisfactory, the Contractor shall bear the cost of the test and the cost of
correcting any defects in accordance with the instructions of the Project Engineer.
3.12
Normal Finish to Faces of Structural Concrete:
After removal of shuttering, unless instructed to the contrary, the face of exposed concrete is to be
rubbed down immediately to remove fins or other irregularities. In the event of part of the
concrete being honeycombed, such portions are to be cut to a depth and shape required by the
Project Engineer and made up with fine concrete of equal quality in such a manner as shall be
directed. The face of concrete for which shuttering is not provided, other than slabs, is to be
smoothed with a wooden float to give a finish equal to that of the rubbed down surface where
shuttering is provided.
3.13
Fair-faced Concrete:
Where so described or measured, faces of concrete shall be finished fair by means of form Work
lined with approved hard board, so as to produce a perfectly true surface and shall have all
imperfections on the concrete face cut out, made good in cement mortar to match the texture and
colour of the concrete and rubbed down with carborundum stones dipped in cement grout to finish
clean and smooth to a high standard, without trace of shuttering marks, joints or other
disfigurements.
3.14
Holes, Pipes, etc.:
The Contractor shall be responsible for co-ordinating the incorporation of electrical conduits,
pipes, fixing blocks, chases, holes, etc., in concrete members as required. The Contractor shall
submit full details of these items to the Project Engineer for approval before the Work is put in
hand. Concrete fixing blocks may be embedded in the concrete provided that the strength or
effective cover of any part of the structure is not adversely affected or the finished Work damaged
by any movement of the blocks. All fixing blocks, chases, holes, etc., to be left in concrete shall
be accurately set out and cast with the concrete. No openings, chases, holes or other voids shall be
cut or formed in concrete without the approval of the Project Engineer.
3.15
Mixing:
Concrete is to be mixed in a batch mixer of approved type having a drum rotating about a
horizontal or inclined axis. The speed of the drum is to be not more than twenty and not less than
fourteen revolutions per minute.
The fine and coarse aggregate and the cement are to be mixed for at least four turns of the drum,
after which the required amount of water is to be added gradually while the drum is in motion and
the concrete then mixed for at least one and a half minutes and until of uniform colour and
consistency.
The volume of concrete mixed in any one batch is not to exceed the rated capacity of the mixer.
The whole of the mixed batch is to be removed before materials for a fresh batch enter the drum.
On cessation of Work, including all stoppages exceeding 20 minutes the mixers and all handling
plant are to be washed out with clean water. Concrete mixed as above is not to be modified by the
addition of water or other wise in order to facilitate handling, or for any other purpose. A least one
slump test shall be made each day as concreting is in progress under the supervision of the Project
Engineer. The slump shall not exceed 7.5 cm.
3.16
Transporting:
Concrete is to be handled from the place of mixing to the place of final deposit as rapidly as
practicable by the methods which will prevent segregation or loss of ingredients. It should be
deposited as nearly as practicable in its final position to avoid re-handling or flowing. Concrete
shall be placed in the forms from as small a height as possible and shall in no case be dropped
from a height of more than 1.8 meter except with the approval of the Project Engineer. When
chatting is used, the inclination of the chute must be such as to allow the concrete to flow without
the use of excessive water & without segregation or loss of the ingredients. Details of any
proposed chatting plant must be approved by the Project Engineer before the plant is delivered to
the Site.
Reinforcing Steel
TMT or Cold deformed steel rod reinforcement shall comply with Standard code of practice.
Test certificates may be required from the suppliers, and in addition the Contractor must
undertake tensile and bending tests on random samples of the reinforcement delivered to the Site.
All steel, which is represented by a sample if fails to reach the minimum required tensile strength
is to be removed from the Site immediately.
The steel shall be stored so that it is kept clean and reasonably free from rust.
All metal for reinforcement is to be free from loose mill scale, loose rust, oil and grease, or other
harmful matter immediately before the placing of the concrete.
All reinforcement is to be placed and maintained in the position shown on the drawings. Some
definite method of ensuring the amount of cover required by the designer must be agreed between
the Contractor and the Project Engineer.
All bars are to be bent cold. Starter bars are to be positioned accurately. All crossing of bars are
to be securely wired. The prices of all bar reinforcement are to include for cutting to lengths and
for all bending, hooked ends, etc., and for placing in position with distance pieces were necessary
to ensure the rigidity of the bars and for tying together with approved wire in order to prevent
displacement during concreting, and for rolling margins.
The placing of all reinforcement shall be checked by the Project Engineer and in no circumstances
is concrete to be deposited around any steel that has not been approved. At least 24 hours notice
shall be given to the Project Engineer that reinforcement will be ready for inspection.
Where bending schedules are provided, the measured weight of reinforcement for purpose of
payment will be taken from the bending schedules and the Contractor must make due allowance
in his rates for rolling margins and all the foregoing items and labours, including cutting to waste
from random lengths. As for the lap of the reinforcement the Project Engineer in charge shall
check the numbers of the lap actually provided at the Site before casting and the final quantity for
the lap shall be approved on the bar schedule for final payment.
3.17
Cover to Reinforcement:
The thickness of the concrete cover to reinforcement shall be as directed by the Project Engineer.
Some approved method of ensuring the correct amount of cover shall be used.
3.18
Spacing Blocks Chairs, etc.:
Properly formed spacing blocks of concrete with wire ties or other approved means shall be
securely wired or attached to the reinforcing bars to ensure the maintenance of the proper cover of
concrete. These shall be dense concrete left with a wire brushed surface or be dipped in grout
before fixing. These blocks are particularly important where the surface of the concrete is exposed
to the weather or dampness. The Contractor must ensure that the bars are securely fixed so as to
maintain their indicated positions during the progress of pouring, tamping or vibration of
concrete. Proper chairs as per the instruction from Project Engineer bars are to be provided to
support top steel in slabs. Steel in walls and similar members is to have adequate horizontal
spacers or as per direction at Site from Project Engineer. This steel for this chairs shall be counted
before the casting of the proposed concreting and the approved quantity will be add to the bar
schedule.
4.
BRICK WORK:
4.1
Brick Work:
Generally all bricks must be obtained form chimney or machine made as stated in BOQ and are
referred to as "Standard" bricks nominally 23cm x 11cm x 7cm or equivalent first class bricks as
approved by the Project Engineer.
The bricks shall be best quality well burnt bricks, true to shape, with square arise and of uniform
size and such that four courses of brick Work (when built) rise 26cm.
Sample bricks are to be submitted to the Project Engineer for approval and the Project Engineer
will reject any bricks delivered to the Site which in his opinion are not of the same quality, shape
or colour as the approved sample.
4.2
Walling Finish:
Where walling is to be finished with a fair face, the bricks are to be selected so that the exposed
face is free from defects and the joints finished flush as the Works proceed. The faced Work shall
be kept perfectly clean and no rubbing down of brick Work will be allowed.
Where brick Work is to be plastered the joints shall be raked out as the Work proceeds.
4.3
Walling Building:
Bricks shall be wetted before being laid and the top of walling where left off shall be wetted
before re-commencing building. Walls to be kept wet seven days after building, bricks shall be
well buttered with mortar before being laid and the brickwork carried up evenly course by course
so that no part is allowed to be carried up more than one meter higher at any time than any other
part.
4.4
Setting out Walling:
The Contractor shall provide proper setting-out rods and set out all Work on same for corners,
openings, heights, etc. and shall build the walls and piers etc. to the width, depth and height as
shown on the drawings and as directed and approved by the Project Engineer.
4.5
Bonding Walls:
Load bearing brickwork generally shall be of Standard practice bond and reinforced as shown on
the detailed drawings. One brick walls (nominal thickness 23cm) shall be in English Bond and
half brick walls (nominal thickness 11cm) in Stretcher Bond. No broken bricks or bats shall be
used unless required to form bond. All perpends, quoins, reveals and other angles of walls shall be
built strictly true and square.
4.6
Mortar:
Unless otherwise specified, all mortar shall consist of cement and sand in the proportion as
described in the Bill of Quantities.
The ingredients of mortars shall be measured in proper gauge boxes on a boarded platform all
being mixed dry and again whilst adding water. All mortars shall be thoroughly mixed to a
uniform consistency with only sufficient water to obtain a plastic condition suitable for towelling.
Mortar which has commenced to set shall not be used or knocked up again for use.
4.7
Filling for Brick Work:
Where brick Work cavities are specified to contain reinforcing bars they shall be filled with
concrete mix as specified. The filling shall be placed and consolidated in section not exceeding 1
meter in height. Cavities that are to be filled shall be kept free of all mortar droppings.
4.8
Brick Lintels:
Lintels over doors and under openings except where in concrete shall be formed in brick Work by
reinforcing the three courses immediately above the opening with steel wire reinforcement resting
45 cm at either end of the opening and the rates are to include for any necessary centring.
4.9
Putlog Holes
All putlog holes shall be not less than one course deep and carefully filled with bricks cut to fit
size of opening with beds and joints filled with mortar well tamped in after scaffolding is
removed.
4.10
Keeping Clean
The Contractor shall allow in his rates for keeping the fair faced brick work free from mortar at all
times and for cleaning the work at completion.
4.11
Sliding Joints
Where sliding joints are indicated on the drawings two layers of bitumen coated galvanised steel
sheet shall be provided.
5.0
STONE MASONRY WORK
5.1
General
Construction shall be carried out in accordance with I.S. 1597-1992, Code of Practice for construction of
stone masonry, Part 1 Rubble stone masonry or Part 2 Ashlar Masonry as appropriate. All stratified stone
possessing bedding planes shall be laid with its natural bed as nearly as possible at right angles to the
direction of load. In the case of arch rings, the natural bed shall be radial. Facework groins shall be built
to a height not exceeding one meter in advance of the main body of the work and adjacent walling
stepped down on either side. Masonry face work between the groins shall then be built to a height not
exceeding 500 mm above the backing which shall then be brought up level with the completed facework.
At no time shall the backing be built up higher than the facework.
Except for dry rubble walling, all joints (gaps) shall be sufficiently thick to prevent stone to stone contact
and the gaps shall be completely filled with mortar. Stones shall be clean and sufficiently wetted before
laying to prevent absorption of water from mortar.
Placing loose mortar on the course and pouring water upon it to fill the gaps in stones shall not be
allowed. Mortar shall be fluid, mixed thoroughly and then poured in the joints. No dry or hollow space
shall be left anywhere in the masonry and each stone shall have all its faces completely covered with
mortar of the thickness as specified for joints.
The bed which is to receive the stone shall be cleaned, wetted and covered with a layer of fresh mortar.
All stones shall be laid full in mortar both in bed and vertical joints and settled carefully in place with a
wooden mallet immediately after placement and solidly embedded in mortar before it has set. Clean and
wet chips and spalls shall be wedged into the mortar joints and bed whenever necessary to avoid thick
joints or bed of mortar. When the foundation masonry is laid directly on rock, the bedding face of the
stones of the first course shall be dressed to fit into rock snugly when pressed down in the mortar
bedding over the rock. For masonry works over rock, a leveling course of M15/40 or M15/20 concrete
100mm thickness shall be laid over rock and then stone masonry work shall be laid without foundation
concrete block.
In case, any stone already set in mortar is disturbed or the joints broken, it shall be taken out without
disturbing the adjoining stones and joints. Dry mortar and stones thoroughly cleaned from the joints and
the stones shall be reset in fresh mortar. Sliding one stone on top of another which is freshly laid, shall
not be allowed.
Shaping and dressing of stone shall be done before it is laid in the work. Dressing and hammering of the
laid stones which will loosen the masonry, shall not be allowed.
Building up face wall tied with occasional through stones and filling up the middle with stones spalls and
chips or dry packing shall not be allowed. Vertical joints shall be staggered. Distance between the nearer
vertical joints of upper layer and lower layer in coursed rubble masonry shall not be less than half the
height of the course.
Masonry in a structure between two expansion joints shall be carried up nearly at one uniform level
throughout but when breaks are unavoidable the masonry shall be raked in sufficiently long steps to
facilitate jointing of old and new work. The stepping of raking shall not be more than 45 degrees with
the horizontal.
Masonry shall not be laid when the air temperature in the shade is less than 3°C. Newly laid masonry
shall be protected from the harmful effects of weather.
5.2
Concrete Capping
Where masonry structures are to receive a concrete capping, the joints to the upper surface of the
masonry shall be raked out to a depth of 10 mm prior to placing of the concrete to the capping. The
concrete for capping shall be as per the Drawing or as directed by Engineer and shall conform to Section
2000.
5.3
Pointing
Where external faces of the mortared masonry work will be backfilled or otherwise permanently covered
up, the mortared joint shall be finished flush to the faces of the adjacent stonework.
Where mortared masonry faces will remain exposed, the mortar joints shall be pointed to a consistent
style as shown on the Drawing. Pointing shall be carried out using mortar 1:3 by volume of cement and
sand or as shown on the Drawing. The mortar shall be filled and pressed into the raked out joints before
giving the required finish. The pointing, if not otherwise mentioned, shall be ruled type for which it
shall, while masonry work is still green, be ruled along the centre with half round tools of such width as
may be specified by the engineer. The excess mortar shall,
then, be taken off from the edges of the lines and shall not be unnecessarily plastered over the exposed
stone works. The thickness of the joints shall not be less than 3mm for Ashlar masonry.
However, the maximum thickness of joints in different works shall be as follows:
Random Rubble
:
20mm
Coursed Rubble
:
15mm
Ashlar Masonry
:
5mm
5.4 Ashlar
All stones shall be dressed to accurate planes on the beds and joints and they shall be fair and neatly or
fine tooled on the face unless otherwise described in the contract.
5.5 Block-In-Course
Beds and joints shall be squared and dressed for a distance of at least 220 mm from the exposed face.
Bond stones shall form at least one sixth of the area of the exposed face and shall extend at least 900 mm
into the wall or for the full thickness of the wall if the latter is less than 900 mm. Unless described in the
contract as tooled or drafted, the exposed face of all stones shall be blocked and left rough. Arises shall
be dressed square at all beds and joints.
5.6 Square Rubble-Coursed Or Broken Courses
All stones shall be truly squared and dressed for a distance at least 120 mm from the face of the wall.
Bond stones shall be provided at the rate of at least one to every 0.8 m2 of exposed face and shall
measure not less than 150 mm x 150 mm on the face and not less than 450 mm in length or the full
thickness of the wall, whichever is the less. Vertical joints in any layer shall be broken in the next layer
and the horizontal lapping of the stones shall not be less than 100 mm.
5.7 Random Rubble - Coursed Or Uncoursed
All stones shall be carefully set with a bond stone provided at the rate of at least one to every 0.9 m 2 of
exposed face. Bond stones shall measure not less than 150 mm x 150 mm on the exposed face and not
less than 450 mm in length or the full thickness of the wall, whichever is the less.
5.11
Test And Standard Of Acceptance
Before laying any mortar, the Contractor shall make three sets of mortar test cubes from each source of
sand to demonstrate the compliance of the mix to the specified strength. Each set shall comprise two
cubes, one to be tested at 7 days and the other to be tested at 28 days. During construction, the
Contractor shall make and test mortar cubes at the rate of three cubes for every 10 m3 of masonry to
assess the strength subject to a minimum of 3 cubes samples for a days work. Testing of cubes shall be in
accordance with IS 2250. The stones shall be tested for the water absorption as per IS: 1124 and it shall
not be more than 5 percent. The stones shall also be tested for Specification gravity and it shall not be
less than 2.65. Sand shall be tested as per Clause 613 or as directed by the Engineer. At least 3 set of
tests for stone and sand shall be conducted for every source.
About one square meter (1mx1m) measured in front face of the completed stone masonry in every 200
sq.m or part of it shall be dismantled during the process of construction up to complete depth and the
aggregate volume of the stones having volume more than 0.01m3 shall be obtained by the method of
displacement of water to find the volume of spalls and mortars in the case of mortared masonry and the
volume of spalls and voids in the case of dry masonry. The dismantling shall be made in such a manner
that the quality of the surrounding work is least affected. While dismantling, the tightness of the joints
shall also be compared with the thickness of joints as specified for assessment of the quality of work. If
the volume of spalls and mortars is more than the specified volume and/or the joints are not filled
completely with mortar, then the entire work which the sample and test represent, shall be rejected.
The dismantled portion shall be made good by the Contractor at his own cost after completion of the test.
6.
WOOD WORKS
6.1
General
Timber for carpentry and joining shall be of salwood of best quality, free from saps, fissures,
knots, sare and/or other defects. All beams and scantling shall be sawed along grain and under no
condition beams, rafters, wall plates, blocks etc. shall be sawed across grain. All timber and
assembled wood Work shall be protected from weather for which temporary shed shall be built.
All timber shall be stored at least 75 cm above ground level or more, if deemed necessary, and
individual members shall be separated by strips so that air may circulate around all four sides. All
wood Work except door/window frames or ceiling shall be painted with two coats of creosote
conforming to IS 218 1952.
(A)
Doors and Windows Frames
All doors and windows frame shall be planed at three exposed sides, and neatly and truly finished
to the exact dimension in all side as given in drawings. All joints shall be mortise and tenon
(Single) with wedges. Glue of approved quality shall be applied at all joints before clamping. All
frame shall be 6cm x 12.5cm finished and shall be rebated single/both sides or as in drawings.
All door and window frames shall be placed truly vertical and in position as shown in drawings.
No gap shall be left between jamb and inner face of the frame. Holdfast of size as shown in
drawings shall be fixed to frames and of size as shown in drawings shall be fixed to frames and
concreted by 1:2:4 c.c. in the wall. Measurement of wood work under this heading shall be in
volumes for the finished work fixed in position all complete.
(B)
Shutters/Panels/Leaves (Joinery)
The shutters may be fully panelled, fully glazed, partly glazed and partly panelled, battened or
venetian as specified. Styles and panels shall be neatly planed and truly finished to exact
dimensions. Styles and rails shall be framed properly and accurately with mortise and tenon joints
and fixed with bamboo pins as per drawing. Panels shall be of one piece without any joints and
shall be housed with 12mm insertion into rails and styles.
Panels shall be of thickness as specified in the drawing. All rails above 10cm in width shall have
double tenon. No tenon shall exceed 6mm the thickness of the member. In case of swing door,
seeing door hung in lace shall not be rebated together. It shall be fitted with vision peerless.
6.2
Carpentry and Joinery
Timber
Generally the timber for carpentry and joinery shall be salwood of the best quality obtained form
an approved saw mill.
The timber shall be reasonably straight grained.
All timber for the Works is to be purchased immediately after the contract is signed and is to be
opened stacked for as long as possible before use or kiln drying.
All timber as it arrives on the Site shall be inspected by the Project Engineer, and any timber
brought on to the Site are not approved must be removed forthwith.
All timber and assembled wood work shall be protected from the weather and stored in such a
way as to prevent attach by termites, insects or decay fungi.
Insect Damage
All timber shall be free from live barer beetle or other insect attack when brought upon the Site.
The Contractor shall be responsible to the end of the maintenance period for executing at his own
cost all Work necessary to eradicate insect attack of timber which becomes evident, including the
replacement of timber attached or suspected of being attacked, not with standing that the timber
concerned may have already been inspected and passed as fit for use.
Seasoning of Timber
All timber shall be seasoned to a moisture content of not more than 22% for carpentry and 15%
for joinery. The Contractor's price must include for any kiln drying that may be necessary the
achieve these figures.
Inspection and Testing
The Project Engineer shall be given facilities for inspection of all works in progress whether in
Workshop or on Site. All timber as it arrives on the Site and not approved by them must be
removed forthwith, failing which the Employer, with the advise of the Project Engineer, may
arrange for the removal of the rejects and impose of them as they may consider advisable at the
Contractor's expenses.
Notwithstanding approval having been given as above, any timber incorporated in the Works
found to be in any way defective before the expiry of the maintenance period shall be removed
and renewed at the Contractor's expense. The Contractor is to allow for testing or prototypes of
special construction units and the Project Engineer shall be at liberty to select any samples they
may require for the purpose of testing i.e. for moisture content, or identification of species,
strength, etc.
Where timbers need to be extended into a wall, they shall be thoroughly "Brush Treated" with a
wood preservative approved by the Project Engineer, and as much clear air space maintained
around the timber where it adjoins the wall as possible.
Clearing Up
The Contractor is to clear out and destroy or remove all cut and shavings and other wood waste
from all parts of the building and the Site generally, as the work progress and at the conclusion of
the work.
6.3.1. Carpentry
All carpentry shall be executed with workmanship of the best quality. Scantlings and boarding
shall be accurately sawn and shall be of uniform width and thickness throughout. All carpenter's
work shall be left with sawn surface except where particularly specified to be wrought.
All carpenter's work shall be accurately set out in strict accordance with the drawings and shall be
framed together and securely fixed in best possible manner with properly made joints. All
necessary brads, nails and screws, etc. shall be provided as directed and approved.
Actual dimensions of scantlings for carpentry shall not vary from the specified dimensions by
more than 3mm in deficiency or excess but must be uniform throughout. Boards 25mm thick or
less shall hold up to the specified sizes. All timbers shall be as long as possible and practicable, in
order to eliminate joints.
6.3.2. Joinery
Generally all joiners’ work shall be accurately set out on boards to full size for the information
and guidance of the artisans before commencing the respective works, with all joints, iron work
and other works connected therewith fully delineated. Such setting out must be submitted to the
Project Engineer and approved before such respective works are commenced.
All jointer's work shall be cut out and framed together as soon after the commencement of the
building as is practicable, but is not to be wedged up or glued until the building is ready for fixing
same. Any portions that warp wind or develop shakes or other defects within twelve months after
completion of the works shall be removed and new fixed in their place on Contractor's own
expense.
All work shall be properly mortised, tennoned, housed, shouldered, dovetailed, notched, wedged,
pinned, braided, etc., as directed and to the satisfaction of the Project Engineer and all properly
glued up with the best quality approved glue.
Joints in joinery must be as specified or detailed, and so designed and secured as to resist or
compensate for any stresses to which they may be subjected. All nails, springs, etc. are to be
punched and puttied. Loose joints are to be made where provision must be made for shrinkage,
glued joints where shrinkage need not be considered and where sealed joints are required. Glue
for load-bearing joints or where there is damp conditions must be of the resin type. For non-loadbearing joints or where dry conditions may be guaranteed casein or organic glues may be used.
All exposed surfaces of joinery Work shall be wrought and all arises "eased-off" by planning and
sand papering to an approved finish suitable to the specified treatment.
Dimensions
Joinery shall hold up to the specified sizes and as measured.
Fixing Joinery
All beads, fillets and small members shall be fixed with round or oval brads on nails on nails well
punched in and stopped. All large members shall be fixed with screws; the heads let in and
palliated to match the grain.
Unless otherwise specified, plugs of external work shall be of hardwood, plugs for internal work
may be of softwood. Holes for plugging must be made with a proper drilling tool and the holes
completely filled with the plugging material.
Unless otherwise specified all skirting, window, grounds and backings for same, fillets etc. shall
be plugged at intervals not exceeding 60cm.
Budding Joiner
All door and window frames, sills, wooden bars etc., which are fixed to brickwork, concrete by
means of grounds, lugs, etc., shall be bedded solid in mortar as previously described and pointed
with a recessed joint 6mm deep to the approval of the Project Engineer.
Plywood’s, Blackboards, Chipboards etc., shall be of a standard quality. They shall be bonded
with synthetic resin or "interior" type unless otherwise stated. Where stated to be "exterior" type,
they shall be weatherproof. All exposed edges of blackboard and clipboard shall be lipped with
hardwood as described below.
Samples of all such materials and their source of manufacture must be approved by the Project
Engineer before used in the works.
Plastic Sheeting
Shall be approved laminated sheeting 1.5mm thick, securely fixed by means of Aerodux 185
adhesive, and in colours approved by the Project Engineer.
Flush Doors
All flush doors shall be of approved solid core construction finished with 4mm approved plywood
for painting (unless otherwise described) and lipped all round with hardwood 12mm thick.
Where described as "External Quality" flush doors are to be finished with weatherproof plywood
as before described and sample doors must be approved by the Project Engineer before the doors
are completed.
6.3.3. Ironmongery
All locks and Ironmongery shall be fixed with screws, etc., to match. Before the woodwork is
painted, handles shall be removed, carefully stored and re-fixed after completion of painting and
locks oiled and left in perfect working order.
Prices for fixing locks must include for organising master-keying systems if required and all keys
shall be labelled with door references marked on approved labels before handling the Project
Engineer on completion.
Hardware
All panels except where specified in the drawing shall be fitted with frames having steel double
breasted butt hinges. Window frames shall have three 7.5cm / 2.00 mm thick hinges on each panel
whereas the size of hinges for door panels shall be as follows:
Width of panels (up to 75cm) - 10cm double breasted butt hinge, 2.00mm thick, 3 nos.
Width of panels exceeding 75cm - 12.5cm double breasts butt hinges, 2.25mm thick, 3 nos.
Following shall be the size of the screw:
For 7.5cm hinges For 10cm hinges For 12.5cm hinges-
25mm long No. 8
30mm long No. 9
45mm long No. 10
Above No. refers to Nettle folds or equivalent screws only.
Doors shall be fitted with double-action automatic hydraulic door closers wherever instructed.
Tower Bolt
All tower bolts shall be of aluminium with bolt casted monolithic with the handle. Following shall
be size of the tower bolt.
Windows Panels
Door
15cm top and bottom
15cm top
15cm bottom (wherever necessary)
All screws shall be of Nettle fold or equivalent suitable lengths and diameter.
Handles
All doors shall be provided with handle on both sides and all windows with handles on the inner
side only. Door handled shall be minimum 15cm clear inside and window handle 10cm clear.
All doors shall be fitted with mortise lock of heavy quality, preferably of aluminium.
Measurement
All door and windows panel shall be measured in area flat. Overlap of shutters shall not be
measured. The rate shall be for the complete work including hanging, fixing in position, cost of
fittings and hardware.
Note
A sample of hardware (tower bolts, handles, hinges, catch and allotrope and screws) will be
displayed at the site at Project Engineer's office as the sample of desired quality and design. The
Contractor shall submit samples of hardware in writing to Project Engineer for approval.
7.
METAL WORK
Generally all materials shall be the best of their respective kinds, free from defects, and to be
obtained from approved manufactures. All work shall be carried out in a workman like manner
and strictly as directed by the Project Engineer. The materials in all stages of transportation,
handling and storage shall be kept clean, free from injury and breaking, bending and distortion
prevented.
All smith's work shall be forged clean from the anvil, all screwed work shall have full internal and
external threads.
Balustradings, etc., shall be well framed together and all connections properly fitted, shouldered,
drilled, tapped and screwed together with set screws counter sunk flush with the surface where
indicated.
Welded joints shall be neatly made, filed smooth and left clean and adequate means shall be
employed for temporarily fastening the parts to be welded together until the joints are welded.
Nails, Spikes and Bolts shall be of approved manufacture and best quality mild steel or wrought
iron of lengths and weights approved by the Project Engineer.
Nails shall comply with the relevant British or Indian standard Specification.
Windows and Frames
Windows shall not be forced into openings which are out of square or too small. The windows
shall be secured at head jamb and sill, and care shall be taken that windows shall be secured
distorted when screwing up to lugs and fixing screws. Windows shall be grouted with cement
mortar into the prepared openings and joints between building openings and window frames shall
be caulked with mastic cement obtained from the window manufactures.
Building in
Unless otherwise described, all items of metal work shall include for "building in" to concrete or
walling etc. and for "making good" finishing thereto.
8.
STRUCTURAL STEEL WORK
Materials and workmanship shall conform to the requirements of B.S. 449 or equivalent. All mild
steel sections shall conform to the requirements of B.S. 15 or equivalent.
Shop Drawings
The Contractor is to prepare all the necessary shop drawings together with a marking plan
indicating the location of the various individual members.
Copies of the shop drawings are to be submitted to the Project Engineer for their approval and no
Work is to be carried out until the Contractor receives this approval.
Welding
All welding is to be strictly in accordance with section C of B.S. 449 or equivalent. The Project
Engineer are to be informed when the welded Work is ready for inspection and any such work
must be left up-primed until the Project Engineer give their approval in writing.
Painting
All steel Work shall be wire brushed and free from loose scale and rust and painted with one coat
of red oxide paint before being dispatched to the site. Surfaces brought into contact are to be first
painted with red oxide paint and bolted together whilst wet. After erection the painting shall be
inspected and all damaged areas, bolt heads etc., are to be painted as necessary.
Erection
The Contractor shall furnish at his own expense all necessary tools, staging, temporary members,
guy anchors and all materials of every description which he may require for the safe erection of
the steel work and remove the same when the work is completed. The Contractor shall be solely
responsible for any damage done to the structure during erection and any members which have
been bent or otherwise distorted either before or during erection shall be straightened or replaced
in an approved manner at his own expense.
Holes and Fixings
The Contractor shall ensure that all necessary holes or fixings, such as for electrical fittings, are
correctly positioned in accordance with the Project Engineer's instructions.
Dimensions
The Contractor shall be solely responsible for the accuracy of the fitting together of the steel work
and shall make all necessary site measurements.
Inspection
The Project Engineer shall be at liberty at all reasonable times to enter the Site of the Works, or
any other premises in which the work in being prepared for the purpose of inspection. Any work
found defective or which is not in accordance with the drawings or this Specification shall be
rejected and such defective work shall be at once made good at the Contractor's expenses.
9. GLAZING
Glass
All glass shall be of standard quality free from flaws, bubbles, speaks and other imperfections.
Glass panes shall be cut to sizes to fit the openings with not more than 1.5mm play all round and
where puttied shall be spragged to wood or clipped to metal frames.
Clear sheet glass ------- O.Q. quality.
Cast and/or obscured glass -of pattern and equal to sample approved by the Project Engineer.
Plate glass ------- S.G. quality or "Float" Glass.
Putty for glazing in steel frames shall be composed of pure linseed oil and powdered whiting free
from grittiness.
Rebates of metal rames receiving glass shall be prepared and treated with primer for putty prior to
glazing and putty shall be primed ten days after glazing (See Painting).
Glass louvers shall have ground edges and be fixed in accordance with the instruction of the
louver frame manufacturer.
10.
Mirrors shall be 6mm S.S.G. silvered plate glass with polished edges, and shall be drilled for and
fixed with four chromium plated screws with detachable dome heads.
On completion remove all broken, scratched or cracked panes and replace with new to the
satisfaction of the Project Engineer. Clean inside and out with approved cleaner. On no account
shall windows be cleaned by scrapping with glass.
All glass panes shall have edge-clearance, when fitted, of 1.5mm all round.
PLASTERWORK AND FINISHING
Plastering shall be made up of mortar consisting of cement, sand in the proportion of one part
cement and 6/4/3 part sand by volume, or as specified in the drawing. Cement shall be fresh and
free from impurities; river bed sand shall be used. Sand for plastering shall be finer than the sand
used for concreting or stone work. Following shall be proportion of different size of grains.
Grain
Percent
0 to 0.5 mm
0.5 to 2 mm
2 to 3 mm
=
=
=
30%
50%
20%
Water shall be clean and free from pollution by soil particles, humus, mud, dirt, natural or
vegetable oil, soap and other impurities.
The mortar shall be first dry mixed, by measuring with boxes to required proportion, and then
water added slowly and gradually and mixed thoroughly to uniform consistency.
The thickness of the plaster shall not be less than 10 mm not more than 16mm. In case of plaster
thicker than 16mm, it shall be built by two or more coats each coat not exceeding 16mm in
thickness.
Cement shall be as specified above.
Sand shall be as before specified but shall be graded to a suitable fineness in accordance with the
nature of the plaster, etc., in order to obtain the finish required.
Hacking
Prices of all paving and plastering etc., shall include for hacking concrete ceilings, beams, floors
etc., by approved means and for raking out joints of walls 12mm deep to form a proper key.
Plastering on walls generally shall be taken to include flush faces of lintels etc., in same.
Surfaces to be paved or plastered must be brushed clean and well wetted before each coat is
applied. All cement plaster shall be kept continually damp in the interval between application of
coats and for seven days after application of the final coat.
Dubbing out where required shall be composed of similar material to that following.
Partially or wholly set material will not be allowed to be used or re-mixed.
Samples
The Contractor shall prepare sample square meter of the plastering and paving as directed until
the quality, texture and finish required is obtained and approved by the Project Engineer after
which all plastering or paving executed shall conform with the respective approved sample.
Finish
Generally all screeds and paving shall be finished smooth, even and truly level (unless specifically
required to falls and currents, etc.), and paving shall be steel troweled or floated.
Rendering and plastering shall be finished plumb, square, smooth and even.
All surfaces to be plastered shall be thoroughly wetted before any plastering is commenced and
the Contractor shall allow in his prices for dusting external angles with neat cement to give
additional strength.
No plastering will be allowed to take place until all chases for service have been cut, services
installed and chases made good. On no account may finished plaster surface be chased and made
good.
All Work shall be to approval and any not complying with the above shall be hacked away and
replaced, as directed, and at the Contractor's expense.
Tiles on Walls and Floors
Glazed Wall Tiling
The Contractor shall submit samples of tiles for selection and approval by the Project Engineer
and all tiles delivered to the site shall conform to the approved samples with regard to size,
quality, texture and colour.
Rates for linear items shall include for all special fittings and cutting at angles and intersections.
Protection
All finishing on completion are to be adequately protected against damage by following trades or
any other cause to the satisfaction of the Project Engineer until the works are handed over to the
employer.
11.
FLOORING
11.1.
Earthwork in Filling
Earth filling in floor shall be done with proper ramming in 23cm layers, after sprinkling with
water and consolidating to 15cm. Earth shall be free from rubbish, organic or vegetable growth
including roots, weeds etc. All clods shall be first broken.
Particular care shall be exercised not to dump earth clods in space between foundation trench and
inside face of the masonry.
Measurement shall be in cu.m. of consolidated actual Work.
11.2.
Brickbat Filling
Brickbat boulders shall be hard, tough, sound and durable. No brickbat shall be more than 5cm.
Boulders shall be laid in their natural bed. Smaller size boulders/pebbles shall be used to fill up
gaps between boulders in order to form uniform well-knitted floor structure.
Measurement shall be in cubic meter of actual length, breadth and depth.
11.3.
Concreting
Plain cement concrete in floors with cement, sand and stone aggregate including mixing, laying,
finishing to approved level, lines and dimensions, curing including centring, shuttering all
complete shall be measured in sq.m. with thickness specified.
The concrete shall be either 1:2:4 mix or 1:4:8 mix or as specified in the drawing.
Cement used shall confine to IS and shall be free from lump or such defects.
Aggregate of 20mm nominal gauge shall be properly gauged. Sieving may be insisted upon in
which case the Contractor shall provide/supply necessary sieves and labour at his own cost.
Sand shall be clean inner bed. Grain distribution shall be same as described under `Plastering'.
All mix shall be by volume except cement which shall be proportioned by weight and as
specified. Mixing shall be done on a water tight platform. Material shall be dry mixed after
accurately gauging different materials in wooden boxes. The dry mixture shall be turned over
thrice (at least) till the colour is uniform and then twice while wet. Water shall be added gradually
and no more than necessary to sufficiently wet the materials. Only that much concrete shall be
mixed which can be used within half an hour. Each stock of dry mix shall not be larger than
consuming one bag of cement.
Before laying the concrete, the surface shall be covered with one layer of building paper running
along the room length. Site lap of such paper shall be 15cm or more. Building paper shall be
smoothly curved up to upper level of DPC along the floor edge.
Concrete shall be laid in horizontal layers and gently rammed.
After laying, the concrete shall be allowed to harden, Harden concrete shall be kept wet for 15
days.
In case of machine mixing I.S. code shall be strictly followed and the mixing done under the
supervision of the Project Engineer.
12.
WHITE WASH AND PAINTING
12.1.
White Washing
Fresh white lime slaked at Site of Work shall be mixed with clean water to make thin cream. It
shall be screened through a coarse cloth, and gum (glue) in the proportion of 100 grams to 16
litres of water shall be added.
The surface to be white washed must be dry and thoroughly cleared from dust and dirt. The wash
shall be applied with "Babio" or brush, vertically and horizontally alternately, and the wash kept
stirring in the container while using as per standard code of practice..
No paint should splash on floor or door/window frames and panels.
12.2.
Painting General
Delivery and Application of Paint:
All materials shall be delivered on Site intact in the original drums or tins and shall be mixed and
applied strictly in accordance with the manufacturer's instructions and to the approval of the
Project Engineer. All paints, emulsion paints etc. shall be applied by means of a brush.
12.3
Additional to Paint
The only addition which will be allowed to be made locally will be liquid thinners supplied or
recommended by the manufacturers and none shall be thinned more than approved by the Project
Engineer.
12.4
Colours and Priming
The priming undercoats and finishing coats shall each be of differing tints and the priming and
undercoats shall be of the correct types and tints to suit the respective finishing coats in
accordance with the manufacturer's instructions. All finishing coats shall be of colours and tints
selected by the Project Engineer. The paint work shall have and enamel finish and all paint for
external work shall be exterior quality only.
12.5
Rubbing Down
Each coat of paint shall be properly dried and shall be well rubbed down with fine glass paper
before the next coat is applied. The paint work shall be finished smooth and free from brush
marks.
Samples cards of all paints, etc., shall be submitted to and samples prepared for approval of the
Project Engineer before laying on and such samples, when approved, shall become the standard
for work.
12.6
Programme
The Contractor shall so arrange his programme of work that all other trades are completely away
from the area to be painted when the painting begins.
12.7
Ironmongery, Protection and Cleaning Up
All ironmongery shall be removed from joinery before painting is commenced and shall be
cleaned and renovated if necessary and re-fixed after completion of painting.
Cover up all floors, etc., with non-resinous saw dust or other approved covering when executing
and all painting decorating work.
Paint splashes, spots and stains shall be removed from floors, woodwork, etc., and damaged
surface touched up and the whole of the work left clean upon completion.
12.8
Price to Include
Prices of paints, etc., shall include for preparation of surfaces, rubbing down between each coat,
stopping, knotting, etc., and all other Work in connection as described and as necessary to obtain a
first class and proper finish. Should the description stated in the items of the bills be insufficient in
the Contractor's opinion to obtain such a finish, the Contractor must allow in his prices for such
extra coats, materials or Work necessary to obtain such a finish to the Project Engineer's approval.
Price must include for the provision of all necessary scaffolding, plant and tools, and also for
applying different colours and cutting into where and as necessary.
12.9
Materials
All paint materials are to be obtained from an approved manufacturer. All sealers, primers and
undercoating are to be obtained from the makers of the finishing materials and are to be in
accordance with their recommendation for the particular finish required.
11.10
Knot Sealer
For use on knots and resinous portions of wood Work.
Stopping and filling composed of 9 parts putty to one part of stiff white lead.
12.11
Lacquer
Approved polyurethane eggshell clear lacquer applied in accordance with the manufacturer's
instructions.
Polish shall be an approved brand of wax polish.
Oil shall be best quality linseed oil.
Filler for polished or oiled surfaces to be Beeswax filler.
12.12
Preparation and Priming of Surfaces
Concrete and cement rendered surfaces shall be smooth and free from defects and shall be
allowed to dry out thoroughly. Surfaces shall be thoroughly brushed down and left free from all
efflorescence, dirt and dust.
All such surfaces which are to be finished with oil or enamel paint shall be primed with two coats
of alkali-resisting primer.
Plaster surfaces shall be perfectly smooth and free from defect. All such surfaces shall be allowed
to dry for a minimum period of four weeks. Surfaces shall be stopped with approved plaster
compound, rubbed down flush, thoroughly brushed down and left free from all efflorescence, dirt
and dust.
All such surfaces which are to be finished with oil or enamel paint shall be primed with two coats
of alkali-resisting primer.
Metal work generally shall be thoroughly wire brushed to remove all scale, rust, etc., where such
rust exists, the special anti-rust primer must be used.
Shop-primed surfaces shall have all bare places touched up with an approved metal primer.
Galvanise surfaces shall be thoroughly weathered, brushed down with white spirit, washed down
and given one coat at zinc chromate primer.
Bituminous coated surfaces shall be given an isolating coat of shellac knotting followed by an
approved metal primer. Woodwork generally shall be rubbed down, given one coat shellac
knotting, one coat aluminium self knotting primer, and all cracks, nail holes, defects, and uneven
surfaces, etc., stopped and faced up with hard stopping rubbed down flush. Before oiling wood
Work all stains must be removed and uniform colour obtained and filled.
12.13
Wood Preservative
All wood Work, as specified or instructed shall, be treated after cutting and preparation but before
assembly or fixing with three coats of solution consisting of one part of Atlas "A" wood
preservative brown grade to three parts of water. The solution is to the brushed in all faces of all
timbers unless exposed to view and painted.
The Contractor shall note that this solution is HIGHLY POISONOUS and shall take all necessary
precautions and instruct his Workmen accordingly.
Painting Items as billed hereafter shall comprise the following, and shall all include for preparing
and priming surfaces as above described:Cement Paint
Plastic Emulsion
Paint
Flat oil paint
Oil
Wax Polish
Lacquer
Prime
- Apply two coats.
- Apply a minimum of three coats, using a thinning medium or
water only if and as recommended by the manufacturer. An
approved plaster primer tinted to match may be substituted for
the first cost.
- Apply two undercoats and one finishing coat of enamel gloss oil
paint.
- Apply two coats of flat oil paint, using thinning medium in
accordance with the manufacturer's instructions.
- Apply two coats of linseed oil.
- Apply a minimum of two coats to approval.
- Apply three coats of Polyurethane lacquer as described, to
approval.
- Prepare and prime only before fixing.
12.14. Cement Paint
Cement paint shall be of ready mixed type in sealed container of approved makes. It shall be
procured either in 50kg container or 25kg container. All such container shall have unbroken seal
with manufacturer's name and trade marks as well as a description of contents all clearly marked.
Such paint shall be mixed and applied strictly in accordance with the manufacturer's instructions
and with the approval of Project Engineer. All materials shall be stored in dry place.
Only fresh cement paint shall be used, hard or set paint shall not be used. The container shall be
made loose by rolling and shaking the container before opening.
First a paste shall be prepared by mixing 2 parts of cement paint power with one part of water by
volume and immediately this shall be thinned by adding another part of water to have uniform
solution of consistency of paints.
Before application of paint all dust and foreign materials shall be removed from the surface by use
of wire brush. The surface shall be allowed to run off. The fresh mixed point shall be applied with
broad good quality brush. The paint shall be frequently stirred during application and no mixture
(paint) shall be used after an hour of mixing. The first coat shall be kept wetted for at least 24
hours before the second coat is applied. The surface shall be thoroughly wetted before the second
cost is applied.
The final painted surface shall exhibit uniform and good finished appearance.
Measurement shall being square meter of actual covered area. No extra shall be allowed for
scaffolding, curing and painting corners, plaster strips etc.
12.15. Enamel Paint
Primers and paints shall be of first class approved quality and of approved manufacturer as
specified. These materials shall be ready mixed and in sealed tins with manufacturer's name,
colour and instruction clearly painted in the container.
Preparation
All surfaces to be painted shall be planed and thoroughly sand papered, first by using
No. 120 sandpaper. Nail holes, cracks or other in-equalities shall be filled up by
ordinary putting. Putting shall be made up of 2 parts of best quality whiting (absolutely
dead stone lime) 1 part of white lead, mixed together in linseed oil and kneaded (3 oz.
of linseed oil to 0.5 kg of whiting). A primer coat shall be locally applied in holes,
cracks etc. before putting is applied.
After the surface is dry, it shall be sand paper by using No.60 sandpaper.
Surface so prepared shall be painted with one coat of primer. The primed surface when dry shall
be sand papered by using No. 0 sand paper.
The primed surface so prepared shall be painted with one coat of selected enamel using bristle
brush and not horse hair ones. The paint shall be applied in thinnest possible layers with parallel
strokes.
Care shall be taken to ensure the surface being free from dust or other foreign material before
priming or enamelling the surface. No paint shall splash on the floor, wall jambs, sill or other part
of the building.
13.
ROOFING
13.1
Tiles:
Roofing tiles are to be clay, single lap inter-locking at head and side and with ridge tiles etc. to
match. They are to be uniform in size, shape and colour and free from twist and other defects, in
every respect equal to samples to be deposited with and approved by the Project Engineer.
Replace cracked or damaged tiles and clean down and leave roofs watertight on completion.
13.2
Polythene Sheeting
Underlay sheeting shall be `Visqueen' polythene building sheet 0.25mm thick and laid over rafters
under tiling battens with minimum 30cm or as directed by the Project Engineer.
13.4
Reinforced Cement Concrete Roofing
All as described under the heading "Concrete".
13.5
Galvanised Corrugated Iron Sheet (CGI Sheet) Roofing
The corrugated iron sheet shall be of the gauge 24 B.G. The sheet shall be free from rust and the
zinc covering at the time of fixing shall be in perfect condition.
Each sheet shall be laid on purloin with an end overlap of 15cm minimum of as per drawing and
side overlap of two corrugations. The sheet shall be joined together with galvanised hook bolts of
J type of 8mm diameter, with bitumen and limpet washers. J hook shall be fixed at 30cm interval
along bearer and 60cm along edge. Each bolt shall have "limpet" dome washer in addition to
bitumen washer.
Wind ties of 4cm x 6mm flat iron weighing about 0.6kg/linear meter shall be fixed at the eaves
ends of the sheets fixing the same with purloin by L hook bolts at 1.2m centre to centre distance.
Ridge and hips shall be covered by special ridges and shall be bolted with 30cm lap on either side
so as to prevent the rain driving under it.
Holes in sheets shall be made on the ground; the sheets shall be placed on trestles and holes
punched in the ridge of corrugations from below upward. Unnecessary holes made on the roof
shall be rejected in total.
Measurement shall be taken for the complete wide roof in square area flat superficial area, not
gritted. Wind ties shall be measured under seaport items. Ridges shall be measured in running
meter.
14.
Others
All above and other specifications relating to this project Works shall be in accordance to
prevailing respective Standard Code of Practices.
WATER SUPPLY AND SANITARY INSTALLATION
(A).
1.
General Instructions to the Contractor
General Notes
(i)
All items of Works given in this schedule of quantities shall be executed in
strict accordance with the relevant drawings and Specifications read in
conjunction with the appropriate I.S.I. codes.
(ii)
The quantities given in this schedule are provisional. The Contractor will be
paid for the actual quantity of Works executed as measured at Site. The
Project Engineer reserves the right to increase or decrease any of the
quantities or to totally omit any item or Works. Any claims by the
Contractor on these accounts will not be entertained.
(iii)
The suppliers have to supply the materials as quoted in respective
Specifications. Some brand names have been listed below for the general
guidance of the Contractor. These brand names are used herein merely in
describe the nature of the desired materials and not used to endorse or
indicate a preference for a particular product or manufacture. Goods which
have similar characteristics and provide performance and quality at least
equivalent to those specified and conforming its ISI standards are
acceptable.
Porcelain Clay Sanitary
Hindustan Sanitary
Wares
Wares, Parrywares or
equivalent.
Pump
Crompton or Kirloshar
Equivalent
HDPE Pipe
N.S. 40/041, Nepothene
or equipment
Cisterns
Hindusthan
Parrywere
Chromium Plated (C.P.)
Ego brand, BMT or
Fittings (Fancy Type)
Chromium Plated (C.P.)
Blue star or nova
fittings (Ordinary Types)
Jauqure, Hindustan
Cast Iron Pipes
D.N. Singha, T.D.
Surekha
Galvanized Iron (G.I.)
HIPCO or equipment
Pipes
'S' branch
Galvanized Iron Fitting
'R' brand, Fittings
Looking Mirror
Hindustan or Pearls
Gun Metal Fittings
"GG" or "Leader" makes
or equivalent.
Shoner rule
nova, dugar, news the
equivalence
Flush Valve
Blue Star, Jacguar, EssEss or
Equivalent
Push Valve
Jal, Viking or equivalent.
2.
PVC Pipe
-
PVC Fitting
-
Panchakanya
Equivalent.
Prince,
Supreme
Equivalent.
or
or
Extent Agreement
The Works under the Agreement shall comprise the delivery, installation and testing
at Site, as per Bill of Quantities drawings of pipes, valves, and appurtenance etc.
Required for water supply and sanitary Works
Quality: All materials should conform to qualitative standards as dictated by
I. S.
codes.
Suitability of Goods: The pipes, valves, appurtenances shall be suitable for use
without significant corrosion in transport water.
3.
Interpretation of Terms
Where the words "selected" , "as directed", "as required", words of similar meaning,
are used in the Bills of Quantities. It is to be understood that the selection, direction
or requirements of the Project Engineer are intended. Similarly, the words
"approved", "satisfactory", or other synonyms, shall mean "approved by" or
"satisfactory to" the Project Engineer and the Project Engineer's approval must first
be obtained before the materials ordered or the Works to which the words refer are
put in hand.
Wherever the words "necessary', "proper" or words of similar meaning are used in
the Bills of Quantities with respect to the extent, conduct or character of Works
described, it is to be understood that they shall mean that the said Works shall be
executed to the extent, must be conducted in a manner or be of a character which is
"necessary" or "proper" in the opinion of the Project Engineer.
4.
Position of Sanitary Fixtures, Runs, Pipes
(i)
The recommended positions of the sanitary fixtures, runs of all piping etc. as
shown in the layout drawing will be adhered to as far as possible or as far as
practicable.
(ii)
Should there be any discrepancy or incomplete description, ambiguity or
omission in the drawings and other documents, whether original or
supplementary forming the Agreement, completion or maintenance of the
installation, the Contractor shall immediately on discovering the same, draw
the attention of the Project Engineer to this.
(iii)
Prior to the installation of all fittings, pumps, traps, etc. The finial position
shall be ascertained from the Project Engineer.
5.
Completion Tests
After completion of the Works, the Contractor shall notify to the Project Engineer (in
writing) about the completion of the Works within seven days from the date of this
notification, the Project Engineer or his representative shall remain present at the
time of carrying out the tests by the Contractor.All Works shall be tested in sections
100 Lbs as required, before being covered up to the satisfaction of the Project
Engineer. The Contractor shall include for providing all necessary appliances and
labour for these tests. All water service pipe Works shall be flushed through with a
disinfectant at the expense of the Contractor, upon completion of installation.
All drainage pipe Works shall be robbed through before laying and upon completion
of installation to ensure cleanliness.
6.
Sample
The Contractor shall submit samples of accessories and apart from its proposes to use
in the installation if asked from the Project Engineer for approval to ensure greater
accuracy when setting out pipe Works and to enable practical dimensions of fittings
to be obtained on Site.
Drawing and samples shall be submitted by the Contractor as the Specifications shall
not be departed from without written instructions from the Project Engineer.
7.
Proprietary of Materials
Where proprietary of materials are specified hereafter, the Contractor may propose
the use of similar materials of other manufacture but of equal quality for approval by
the Project Engineer. Should the price of alternate materials proposed be lower in
price, the Contractor shall a revise schedule of price for the particular item along with
his proposal for the use of alternate material in lieu of the one specified.
All materials and goods, where specified to be obtained from a particular
manufacturer or supplier, are to be used or fixed strictly in accordance with their
instructions.
8.
Brand Names
Whenever and wherever brand names are used it is merely to describe the nature of
the desired materials and not used to endorse or indicate a preference for a particular
product or manufacture. Goods which have similar characteristics and provide
performance and quality at least equal to those specified and conforming to I.S.
standards are acceptable.
9.
Packaging
The Contractor is to provide special packaging according to standard practices to
project materials or parts of materials from damage, and his rates will be deemed to
include for all such protection.
10.
Specified Materials
The source of materials stated in the Specifications are those from which materials
are generally available. However, materials not conforming specifications shall be
rejected even if they come from the stated sources. The Contractor should satisfy
himself that sufficient quantity of material of acceptable Specification is available
from the stated or other sources.
11.
Standards
All materials, Workmanship and components shall where applicable and unless
otherwise stated in the Agreement comply with either Indian standard or code
practice current on the date firm for receipt of tenders. The Indian Standards referred
to here are:

Indian Standards (I.S.), Published by Bureau of Indian Standard, India.
Should there be any discrepancy or incomplete description, ambiguity or omission in
the drawings and other documents; whether original or supplementary forming the
Agreement, completion or maintenance of the installation, the Contractor shall
immediately on discovering the same draw the attention of the Project Engineer to
this.
The Works shall be carried out according to these Specifications whether specifically
mentioned elsewhere or not. No extra in any form will be paid unless it is definitely
stated as it is in the Bill of Quantities. Whenever the Specifications are not given or
when the Specification is ambiguous, the relevant Indian standards or British
Standards and further amendments will be considered as finial and binding.
12.
Quantities
The Works shall be related to the drawings which the Agreement is presumed to have
studied. Nothing extra will be paid for any items because of its shape, locations or
other difficult circumstances, even if the schedule makes no distinction, as long as the
item is shown in the drawings.
The quantities given in this schedule are provisional. The Contractor will be paid for the actual quantity
of Works executed as measured at Site and priced at the rates in the schedule. The Project
Engineer reserves the right to increase or decrease any of the quantities or to totally omit any item
or Works. Any claim by the Contractor on these accounts will not be entertained.
13.
Office Accommodation and W.C.
The Contractor shall provide at his own expenses adequate temporary
accommodation and toilet facilities for his Workmen and keep the same in good
order. This may be done to suit Site conditions with the approval of he Project
Engineer. The above mentioned temporary structures shall be removed on the
completion of Works at Contractor's own cost. All materials shall belong to the
Contractor.
14.
Sign Board
A sign board of specified size shall be placed at Site.
15.
Drawing, Instructions, Measurements
All the Works shall be done according to the drawings and instructions of the Project
Engineer and the Contractor shall arrange to test materials and/or portions of the
Works at his own cost in order to prove their soundness and sufficiency. If after any
such test, and in the opinion of the Project Engineer, any Works or position of Works
is found to be defective or unsound, the Contractor shall pull down and re execute the
same at his own cost. Defective materials shall be removed from the Site.
16.
Trees
No trees, saplings shall be removed/cut without prior permission of the Project
Engineer. If may tree has to be cut, this shall form an extra item. For the purpose of
the Specification, a tree shall be defined as growth whose circumferences of the trunk
at 30cm (1'-0") from the base is not less than 90cm (c'-0").
Measuring Materials
Materials requiring measuring shall be measured separately in boxes of appropriate
sized before being mixed.
Measuring Materials
All trenches, walls newly laid, concrete or other Works requiring protection from
weather or accidental injury shall be protected by means of tarpaulin or in any other
way so as to keep the Works immune from damage. Nothing extra shall be paid for
on this matter.
Leaves Clean
On completion, all Works must be cleaned down, rubbish removed and the Works
and land cleared of rubbish, surplus materials, debris and other accumulations and
everything left in a clean and orderly conditions.
Provisional Items
All provisional items in the schedule shall be carried out at the discretion of the
Project Engineer, and may or may not form part of the Agreement. In case the
Agreement. In case the provisional items are carried out by the Contractor, the rates
shall be settled as for extra items as stated in the Conditions of Agreement.
Storage
Safe, dry and proper storage shall be provided for all materials particularly cement.
For cement storage capacity should be equal to at least one fourth the total quantity to
be used but may not exceed 200 tonne (i.e. 4000 bags). If silo is installed at the Site
of Works the Project Engineer may reduce the capacity storage.
Test of Materials
The Contractor shall at his own cost arrange and carry out the tests of materials to be
used in the Works or any other tests as deemed necessary by the Project Engineer.
17.
18.
19.
20.
21.
22.
23.
Maintenance
The completed installation, inclusive of piping, fixtures, pumps, tanks etc. shall not
be finally taken over and acceptance certificate issued to the Contractor until the
expiry of the defects liability period of 6 month. During the period, the Contractor
shall be liable for:
24.
(i)
The replacement of any defective part that may develop in goods of his own
manufacture of supplied by him at his own expense.
(ii)
Bringing to the notice of the Project Engineer any defect arising in materials
supplied by the owner and replacing them, thus rectifying the defects at the
expense of the owner. Until finally taken over, the Contractor shall have the
right of entry to the preamble at his own risk and expense, for maintaining
the installation in proper order.
Accessories
The Contractor has to supply and install all necessary accessories such as eccentric
increases, non-return value, service value and delivery pipes etc. Delivery pipes shall
extend beyond the structure, and connection to main delivery has to be made.
Details of pump and accessories within the pump house are not shown and shall be
according to manufacturer's instructions.
25.
Excavation for Pipe Lines
In excavating trenches for pipe lines, slight rails shall be erected, before excavation is
commenced, at every 100 meters and at all change of direction or gradient. The sight
rail shall consist of a board, not less than 10 centimeters deep, with the top edge
planed true and straight. This shall be supported by a stout wooden post at each end,
and its top edge accurately fixed to a definite and, as far as practicable, uniform
height above the level of the pipe to be laid. The centre line of the pipe shall be
denoted on each rail thereon, and the rail on one side of the centre line painted rail,
and on the other side white. The depth of the excavation and the level of the pipe
invert shall be checked by means of boning rods of appropriate length. The boning
rods used are to be accurately made to the various lengths required, the lower and
being provided with a shoe of sufficient projection to rest on the centre of the invert
of the last pipe laid.
The excavation shall be carried out to the lines and levels shown on the plans or as
ordered by the Project Engineer, and shall be deep enough to permit a minimum
cover as specified hereunder.
Pipe
Minimum Cover in mm
Normal Ground
Cast Iron
Galvanised Iron -
-
750
600
The Contractor shall be responsible for and shall at his own cost, make up all
subsidence or slips whether arising from its nature of the materials in embankments,
from the nature of the ground or from any cause whatsoever. The Contractor shall,
his own expense keep the whole of the Working Site dry and from water and
construct such temporary water courses and drain as may be surface of the Works.
The Contractor shall include in his rates the cost of providing all tools, machinery
and all temporary Works such as staging, struts, shoring, planks and poling boards
and their removal on the completion of the Works and the cost of pumping and
trenches. Whenever pumping is necessary, the whole Works shall be executed as
quickly as possible, due care being taken to avoid excessive pumping, which may
cause settlement of surrounding land and property.
Any trench or excavation which may have been taken to a great depth than necessary
shall be filled into the required level with suitable material approved by the Project
Engineer and rammed solid with watering at the Contractor's expense.
Special care shall be taken provide a solid even bed for the barrel of the pipe, and the
floor of the trench shall be properly shaped to received the gocke it and the barrels of
the pipes. Where lock is met within the trenches, the excavation shall be taken to a
depth of 15 cms of selected filling (approved by the Project Engineer) placed on the
rock and consolidated to form a firm even bed for the pipe where required, socket
holes shall be cut in the rock. In narrow trenches, socket holes shall be cut in the
rock. In narrow trenches, the width of the excavation shall be increased. The sides of
trenches shall be allowed a slope not exceeding 1 to 12, the width at the bottom being
at least 30 cm wider than the socket of the pipe, so as to allow room for ramming the
refilled materials under and at the sides of the pipe.
26.
Re-filling
No refilling shall be carried out until the construction Works has been tested and
approved. The re-filling on the top and around the sewers shall be done with great
care and in such a manner as will obtain the greatest amount of compactness and
solidity possible. For that purpose, the earth shall be laid and rammed in regular
layers not more than 230mm (9") thick up to the surface and also watered and
rammed at each layer. The top soil shall be carefully replaced to match the existing.
27.
Testing of Pipes Lines
Cast Iron and G.I. Pipes
After each section of the pipeline has been laid and jointed and anchorage's built in
for the bends, the pipeline shall be tested in lengths of 2 kilometers or less as directed
by the Project Engineer, by and at the expense of the Contractor. Before testing, the
trench shall be partially backfield except at the units. The accessories nodded viz. Test
pump, pressure gauge, end pieces including connecting valves and piping etc., for
carrying cut the hydraulic tests shall be provided by the Contractor's. The Contractor
shall provide the supply of necessary labour and water for testing at his expense, the
cost of this shall be included in the unit rate for lying and jointing of pipes. The pipes
and joints found to be defective during the test shall be replaced and or reduce by the
Contractor and the related labour cost be met by the Contractor.
The two tests that shall be carried out are (i)
Pressure test a pressure of at least double the maximum Working pressure,
pipes and joints shall be absolutely watertight under the test.
(ii)
Leakage test (to be conducted after the satisfactory completion of the
pressure test) at a pressure to be specified by the Project Engineer for
duration of two hours. Unless otherwise specified the leakage test pressure
shall be the lower or ½ times the maximum static pressure that will be
experienced by the pressure after installation.
q1 =
Where any section of the main is provided with concrete thrust blocks or anchorage's,
the pressure test shall not be made until at least five days have elapsed after the
concrete was caste.
The procedures to be followed are as follows:
(i)
Pressure Test:
Each valve section of the pipe shall be slowly filled with water and
all air shall be expelled from the pipe through hydrants and blowoffs. If these are not available are not available at high places,
necessary tapping may be made at points or highest elevation
before the test is made and plugs inserted after the tests have been
completed.
If the trench has been partially back-filled the specified pressure
based on the elevation of the lowest point of the line or section
under test and corrected to the elevation of the test guage, shall be
applied by means of a pump connected to the poi in a manner
satisfactory to the Project Engineer. The duration of the test shall
not be less than 24 cm.
All exposed pipes, fittings, valves and joints should be carefully
examined. Any cracked or defective pipe, fitting and value
discovered in consequence of this pressure test shall be removed
and replaced by sound material and the test shall to repeat. All
joints showing visible leaks shall also be recalled or redone until
tight.
(ii)
Leakage Test:
Leakage is defined as the quantity of water to be supplied into the
newly laid pipe, or any valve section there of, necessary to
maintain the specified leakage test pressure.
The pipe installation will not be accepted until the leakage is less than the number of
cm3/h as determined by the formulaNDP
3.3
Where,
q1 = the allowable leakage in cm3/h.
N = number of joints in the length of the pipeline.
D = diameter in mm, and
p = the average test pressure during the leakage
test in kg kg./cm2
28.
Testing of Elevated Tank for Water Tightness
When the construction of the elevated tank is completed it shall be tested for water
tightness as follow:
The tank shall be filled with water gradually as directed by the Project Engineer, to
overflow level and after allowing four days for the water to be thoroughly absorbed
by the walls, the walls shall be again brought up to the overflow level and left
undisturbed for 7 days. At the end of this period, there should be no serious
diminution in water level and no signs of leaks weep from the tank walls or bottoms.
In the event of any serious diminution, the Contractor shall empty the tank and carry
out at his own cost such repairs or alternations as required to stop any leak, weep or
other cause of loss of water and thereafter repeat the test till the tank is certified as
watertight by the Project Engineer.
All water, labour, materials, and plant necessary to carry out the tests and repairs
shall be supplied by the Contractor at his own cost.
29.
Checking of Reservoir for Water Tightness
After the construction of the reservoir is completed, and before back filling of any
earthen embankment, unless otherwise verified, it shall be tested for water tightness
as directed by the Project Engineer. The following tests shall be carried out from the
Contractor under the direction and supervision of the Project Engineer. Each
compartment of the reservoir shall be filled with water gradually as directed by the
Project Engineer up to the level of the top of the partition of wall (if after allowing
four days for the water to be thoroughly absorbed by the walls, water level shall again
be brought up to the level of the top of the partition wall (if any) and shall left
undisturbed for seven days. If any diminution in water level is noticed other than
attributable to evaporation, the Contractor shall report the matter in writing to the
Project Engineer and seek his assistance and instructions in determining the cause of
the loss of water. The Contractor shall thereafter marked to effect any repair or
alteration required to stop any cause of loss of water and thereafter repeat the
process again and again, if required, until the reservoir is complete watertight and
satisfactory by the Project Engineer.
Any labour, materials and plant necessary to effect the above checking and testing
shall be supplied by the Contractor at his own cost.
Any tests and similar action shall be taken to determine water tightness of the
reservoir up to its top water level.
The Contractor shall be solely responsible for the water tightness and any remedial
measures necessary.
30.
Disaffection of Reservoirs and Pipe Lines
(i)
Reservoirs: The internal surfaces of the reservoir and external Surfaces of
all pipes and fittings within the reservoir shall be thoroughly cleaned and if
necessary scrubbed to remove all obvious contamination matter and the
water from the operations removed by squeezes and drained out through the
washout main.
(ii)
The reservoir shall then be filled with water containing an approved
hypochlorite or liquid chlorine solution such quantity and such strength as
will result in a concentration of free chlorine of not less than 10 PPM or as
otherwise directed by the Project Engineer. This chlorinated water shall be
allowed to remain the reservoir for a minimum period of 24 hours as
directed by the Project Engineer. Then flushed out.
The reservoir shall be refilled with treated water and the sample shall be
taken for bacteriological analysis accordance with the instruction of the
Project Engineer. If the result of the analysis is unsatisfactory, the sterilizing
process and refilling and sampling shall be repeated until the analysis is
satisfactory.
(iii)
(B)
Pipe Lines:- After the pipe lines have been filled and flushed out to remove
all debris and contaminant matter, it shall be filled with chlorinated water of
strength as prescribed disinfecting of reservoir and pipe line, and left to
stand for 24 hours or such process as directed by the Project Engineer.
Then the pipe line shall be flushed out and refilled with treated water if
subsequent analysis is reveals contamination, the sterilizing process shall be
repeated to the complete satisfaction of the Project Engineer.
Detail (Item) Specification:
1. Sanitary Fixtures & Accessories
All sanitary wares and fittings shall be first class quality white glazed vitreous china
ceramic conforming to is 774, is 2256 and approved by the project Engineer.
1.1
Water Closed (W.C.)
(a)
European pattern W.C. commode and flush valve or cistern.
These shall be
of white glazed vitreous china first class quality, double or single trap
symphonic water closet suite as specified in the Bill of Quantities, P or S Trap flushing cistern
or flush valve as specified conforming to Indian standard specification. The commode and
flushing cistern shall be free from cracks, blisters and shall have smooth surface.
Fixing :- W.C. commode shall be fixed to floor with CP brass screws or by means of 75mm
long 6.5mm dia. counter sunk bolts and nuts imbeded in floor concrete or as per the instruction
of the Project Engineer. The base of pedestal of the commode shall be filled with white cement
mixed with pigment to match the shade of floor or as directed by the Project Engineer.
Following measure shall be adopted for fixing the W.C. commode
(i)
The central axis of the commode shall be perpendicular to the finished face
of wall.
(ii)
The outlet of the commode shall be centrally placed in the rubber gasket of
the HDPE pipe C.I. pipe as per drawing or as directed by the Project
Engineer and shall have not leakage.
(iii)
The distance between centre line of outlet of W.C. commode and finished
wall face shall be so adjusted as to rest squarely against the finished wall
face.
(iv)
Seat and lid: This shall be of ISI marked solid of heavy duty quality and
fitted exactly on the rim of the W.C. Commode with C.P. brass hinges,
rubber buffers and C.P. brass nuts.
Indian Pattern W.C. Pan Flush Valve or Flushing Cistern:
(i)
Indian Pan: These shall be of white glazed vitreous china of first class
quality Indian pattern squatting pans (500mm size) of open rim with back
inlet type with two numbers of white glazed ceramic 1 st class quality nonskid type foot treads and ceramic P or S traps. The pans, foot treads or rests
etc. shall be free from cracks, blisters and shall have smooth surface.
(ii)
Orissa pan: These shall be of white glazed vitreous china 1 st class quality
orissa pattern squatting pans with integral foot treads (580mm size) of box
rim with back inlet type including ceramic P or S traps and complete
accessories. The pan etc. shall be free from cracks, blisters and shall have
smooth surface.
(iii)
Fitting: The W.C. pan Indian or orissa shall be laid on floor slope towards
the pan in a Workman like manner, being taken not to damage the W.C. pan,
etc, in the process of fixing. If damaged in any way, it shall be replaced at
no cost of the employer. The pans, etc should be fixed on a proper base of
cement concrete (1:2:4) mix (1 part cement : 2 parts sand :4 parts stone
balls: of 20mm nominal size) taking care that the cushion is uniform and
even without having any hollows between the concrete base W.C. pans etc.
Joint between the W.C. pan and finished floor shall be neatly done and no
hair cracks shall be visible. Joint between the outlet of W.C. pan and
ceramic p or S trap shall be made with near cement, yarn, linseed oil, white
lead and water proofing compound and made leak-proof. The outlet of the
ceramic traps shall be centrally placed in the rubber gasket of the socket of
the HDPE pipe or cast iron pipe as special or as directed by the Project
Engineer and shall have no leakage.
Flushing Cistern: The flushing cistern shall be white glazed vitreous china
of low level as specified in the Bill of Quantities with complete accessories.
The fixing of cistern shall be as specified clause NO. 1.5.
1.2
Wash Basins
These shall be white glazed vitreous china of first class quality with single or double
tap hole as specified in the Bill of Quantities. These shall be free from cracks, crazes,
blister and shall have smooth surface.
Fixing: The basin shall be supported on brackets s per as manufacturers instruction
and/or on vitreous China pedestal as directed by the Project Engineer. There shall not
be any gap between top edge of the basin and finished face of wall.
C.P. Basin Mixer: - This shall be 15 mm size of C.P. brass central hole basin mixer
with fancy knob heads for hot and stop cocks and castled central spout.
1.3
Sinks
Sinks and its accessories shall be of required size in white glazed vitreous china or
stainless steel, as specified in the Bill of Quantities with overflow. Each sink shall
have one 32mm C.P. brass trap with cleaning eye, union, nuts, etc. Sinks shall be
supported on C.I. or M. S. brackets of heavy type.
Where required, counter top sinks shall be fixed in tables or counters by mean of 40 x
5mm flat screwed to the table. Counter top sinks shall have 40mm C.P. brass waste
with chain and plug 40mm C.P. brass trap with cleaning eye, and union. One C.P. or
aluminum bending 25mm wide shall be fixed to cover to joint between sinks and
table as called for as the Bill of Quantities.
1.4
Urinals
These shall be white glazed vitreous china of first class quality flat back type
(430mm size) with integrated overflow. The urinals shall be free from cracks, blisters
and shall have smooth surface.
Fixing : Urinals shall be fixed on the wall with the help of C.P. brass screws as per
the manufacturer's and/or directed by the Project Engineer. There shall not be any
gap between the back edge of the urinal and finished face of the wall.
1.5
Flushing Cistern
The flushing cisterns shall be manually operated or automatic, high level or low level
s specified in the Bill of Quantities. The cistern may be cast iron or porcelain s
specified in the Bill of Quantities and shall have a removable cover which shall fit
closely on it and be screwed against displacement. In the case of high level cisterns,
the outlet shall be of 32 mm nominal bore and in the case of low level cistern, the
outlet shall be 40mm nominal bore, The discharge rate of the cistern be about 10
liters in 3 seconds when connected to an appropriate flush pipe, and there shall have
to operate with minimum height of 30cm between the top of the pan and the
underside of the cistern. The body thickness of a cast iron cistern shall not at any
place, be less than 0.5cm. Thee body of a pressed steel cistern shall be of seamless or
welded construction of thickness not less than. 1.6mm and shall be porcelain
enameled or otherwise protected against corrosion. . All Working parts shall be
designed to operate smoothly cape efficiently. The symphonic action of a flushing
cistern shall be capable of being rapidly brought into action by the operating lever,
but shall not self syphon or leak.
Fixing of flushing cistern: The cistern shall be fixed on C.I. or R.S. cantilever which
shall be firmly embed in the wall in cement mortar (1:4) or fixed by using wooden
plugs and screws as directed by the Project Engineer. The outlet of flush pipe from
the cistern shall be connected to the pan by means of cement or putty joint. The flush
pipe shall be fixed to wall by using holder butt clamps.
1.6
Water Tanks
Water tank shall be made of G.I. sheet or high density polythene tank as shown on
the drown and specified in the Bill of Quantities. Tank shall be fabricated from new
G.I. sheets of 14 gauge or as directed by the Project Engineer. Thanks with length up
to 1800mm shall be provided with one manhole cover, and of grater length than
1800mm shall be provided with two manhole covers. Manhole covers shall be of G.
I. sheet with locking arrangement as per drawing or as directed by the Project
Engineer.
G. I. Water tank shall provide inlets, outlets, scour and overflow pipes, sockets for
float level switches and inter connections if required. Overflow pipes shall be
provided with a mosquito proof brass grating. Scour pipe of size as specified by the
Project Engineer shall be provided with a bend and pipe piece and plug terminating
outside the tank wall.
Ball cocks used for tanks shall be high or low pressure ball cocks with brass lever
rods and polythene ball floats. The ball floats shall conform to Indian standard which
shall be hammer tested.
C.I. water tank or polethene tank shall be fixed in position ass shown on drawing or
as directed by the Project Engineer.
1.7
Pipes and Fittings (Heavy Duty Cast Iron (H.C.I.) Pipes (Hume Pipe, HDPE or PVC
Pipe)
1.7.1
General Requirements:
All pipe Works to be installed under buildings should be heavy class cast -iron soil
pipes.
No double socket connectors shall be used on the drawings installation without prior
permission of the Project Engineer.
Unless detailed otherwise on drawings, all branches from ground floor soil fittings
discharging direct to drain shall not drop vertically beneath the fitting to a greater
depth than 1400mm. the minimum depth allowed is 100mm below ground level.
All drainage branches shall be extended to a distance of 1200mm beyond the
building, in cast Iron drain.
The Contractor shall check the invert levels of existing drains, sewers and manholes
before laying any new drain or sewer, and shall notify the Project Engineer
immediately the declared invert levels are found to be inaccurate. The Contractor
shall also check the routes and levels of other services to ensure that the routes of the
new drains or sewer do not clash.
The drains shall be laid in straight lines and to even grade to the levels shown.
Connecting drains from fittings etc. not be laid to a gradient of not less than 40,
unless specified otherwise.
No. pipes shall be joined together before being laid. All internal soil and waste pipes
above 50mm diameter shall be installed in cast iron/HDPE/PVC pipe.
All internal waste pipes 50mm diameter and below shall be installed in galvanized
mild steel/HDPD/PVC pipe. All pipes shall be at a fall sufficient to achieve a selfcleansing velocity. All overflows shall terminate with splay cut ends, in position
indicated on drawings.
All pipe Works terminating at roof level shall be fitted with ventilating cowl.
1.7.2
Cast Iron Pipes /PVC Pipe/ HDP and Accessories:
(i)
C.I. and fittings : Soil, waste vent pipe
(ii)
(iii)
All cast iron pipes and fittings shall be according to the relevant I.S.I.
Specifications subject to approve of the Project Engineer, free from fawl and
the inside should be clean and smooth. The access doors of fittings shall be
of proper design provided with (1/8") rubber insertion. The spigot and shall
abut the shoulder of the shoulder of the socket end and leave no angular
space in between. The pipes shall be bitumen painted smooth inside, and
outside shall be painted with 3 coats of anti-corrosive paint as directed by
the Project Engineer.
The pipes shall be of the longest length available and shall conform to the
weights and dimensions conforming to IS: 1536-1967.
Preparation of Pipes: - All pipes shall be inspected both internally and
externally before being put up in position for jointing or lowering into the
trenches. They shall be internally brushed throughout (except in the case of
pipes in coils) to remove any soil, but in such a manner that internal coating
of pies shall not be scratched or injured in any way. The inside of the
sockets and the outside of spigots shall be carefully accumulation or
obstruction.
After clearing and cleaning the pipes and assembling or placing them
alongside the trench, ready for lowering, the lengths shall be lowered into
trenches after being approved by the Project Engineer.
Laying and jointing of cast iron pipes:- The pipes shall be laid in position,
the socket ends of all pipes facing uphill, irrespective of the direction of the
flow of water. Any deviation of less than 111/4 0 in any plane shall usually
be effected by laying the straight pipes to a float curve, of such radius that
the deflections at joints shall not exceed 2 1/20.
After placing a length of pipe in the trench, the spigot end shall be centered
in the socket and the pipe forced home and aligned to gradient. The pipe
shall be secured in place with approved backfill material tamped under it
except at the socket. Pipes and fittings which do not allow a sufficient and
uniform space for joints shall be removed and replaced with pipe and
fittings of proper dimension to ensure such uniform space. At times when
pipe laying is not in progress, the open ends of the pipe shall be closed by a
waters plug or other means approved by the Project Engineer.
The IS code of practice for laying of cast iron pipes (IS No. 3114-1965)
gives in detail methods of laying cast iron pipes below ground level. It also
includes handling and jointing of pipes, hydrostatic tests, back fillings,
restoration and maintenance of surfaces and these shall be followed where
applicable.
Table 1, in the above code also gives the quantity of lead and spun yarn for
different size of pipes.
Cast iron pipes may also be joined by means of flange cast on. The jointing
material used between flanges pies shall be compressed fibber board or
rubber (see No. 638-1955)- Specification for rubber and insertion jointing)
of thickness between 1.5mm and 3mm.
Tighten joints shall be used strictly in accordance will the manufacturer's
instructions.
Concrete thrust or anchor blocks suitably designed shall be provided
wherever necessary to transit hydro pressure. Where the hydraulic thrust is
in an upward direction, anchor blocks of sufficient weight shall be provided
to which pipes shll be secured with steel straps.
(iv)
(v)
1.7.3
1.7.4
Lead caulked joints: Whenever pipes are required to be jointed by lead the
pipes when laid in position for jointing shall be examined for line and level
and the space left in the socket after the yarn has been inserted shall be filled
in by pouring in molten lead. The lead shall be filled at one pouring. The
lead used shall be soft and free from any admixture.
Bracket and hangers: All Cast iron stacks shall be securely fixed with
wrought iron pipe rings and extension pieces in mild steel tube, out to length
required and splayed and built into the structure.
Table of fixing for piping
Material
Pipe size
Horizontal Max
vertical
Max.
Cast iron50mm
2750mm
2750mm
100mm dia.
2750mm
2750mm
The method of joined shall be with well tarrel gasket and molten lead
conforming to IS: 782-1966, caulked tightly home into socket in accordance
to IS: 3114-1965. Care should be taken to ensure that no jointing material
projects inside the bore of the pipe.
(i)
Floor traps: These shall be of self-cleansing pattern conforming to IS: 2556
(XII) - 1973
Testing of C.I. Pipes and Fittings:
All Soil and waste pipes shall be tested to detect any leakage etc. in accordance to IS:
5329-1969.
Measurements:
C.I. pipes shall be measured along the centre line of pipes and fittings in running
meter between socket of pipes or corresponding C.I. fittings. Floor traps shall be
measured by the number. The original C.I. grating shall be kept in it place and
nothing extra shall be paid for it. Floor traps shall be with or without vents and
nothing extra shall be payable on this account. All C.I. specials shall be paid by the
numbers.
1.8
C.I. Pipes & Fittings
1.8.1
C.I. Pipes:
The pipes and fittings shall be galvanized mild steel, mediums (class B) conforming
to IS: 1239. Fittings shall comply with IS: 1897 or equivalent. The method of jointing
shall be by B.S.P. pipe threads on pipe and fittings, painted with jointing compound
and fine hemp. Care should be taken remove any internal burr to pipe before joint is
made. Any exposed thread shall be painted to prevent corrosion. All joints should be
cleaned afterwards. Where water pipes do not fall below sewer lines, they should be
laid at min. dept or 610mm below ground level, if otherwise not stated.
The wall thickness and weight of medium (Class C) pipes in kg/m shall be as below.
Weight of pipe in
Kg/m Screwed
socket
Dimensions of pipes outside
diameter
Maximum
Minimum
mm
mm
Dimension galvanized mild steel
Thickness
mm
Sockets outside
dia. Mm
Min. Approx.
dia. mm
1.23
21.80
21.00
2.65
27.00
37.00
1.59
27.30
26.50
2.65
32.50
39.00
2.46
34.20
33.30
3.25
39.50
46.00
3.17
42.90
42.00
3.25
49.00
51.00
3.65
48.80
47.90
3.25
56.00
51.00
5.17
60.80
59.70
3.65
68.00
60.00
6.63
76.60
75.30
3.65
84.00
69.00
8.64
89.50
88.00
4.05
98.00
75.00
12.40
115.00
113.10
4.50
124.00
87.00
1.8.2
Backsets & Hangers:
All services shall be securely fixed galvanized iron built in pattern holderbats or two
piece rings, extension piece and screw to wall back plate.
Pipe
Horizontal
Vertical
15mm (1/2")
185mm (6')
244mm (8')
20mm (3/4")
244mm (8')
3050mm (10')
5mm (1")
244mm (8')
3050mm (10')
1/4
2 mm (1 ")
2750mm (9')
3050 mm (10')
0mm (11/2")
3050 mm (10')
3660mm (12')
0mm (2")
3050 mm (10')
3660mm (12')
2.3.3
Testing :
All G. I. water supply pipe will be tested in accordance to IS: 2065-1972 and with
minimum 100 IB/………
2.2.4
Laying & Fixing of G. I. Pipes:
Screwed galvanized pipes shall be jointed with screwed socket joints, using screwed
fittings. Care shall be taken to remove any burr from the ends of pipes. After
screwing white lead and fine hemp shall be applied while tightening. Compound
containing red lead shall not be used to prevent danger of contamination of the water.
Any thread exposed after joints shall be painted or in the use of underground piping
thickly coated with three coats of anti-corrosive paint to prevent corrosion. All G. I.
pipes shall be concealed.
In addition to the sectional testing of water supply piping, the Contractor shall test the
entire installation on complete of the job to the satisfaction of the Project Engineer.
He shall be liable for any leakage etc. and to any damage to building furniture there
of up to three months after the final handing of the building. The Contractor shall
rectify all such things and restore damage done to the building and furniture at his
cost.
22.5
Measurement for G. I. Pipes and Fittings
All G. I. pipes and fittings shall be measured along with the centre line of pipes and
fittings and the rates shall be inclusive of fittings.
2.3
S. W. Pipes
Description of the pipe
Depth of Socket
Depth of Yarn
mm
inches
mm
inches
mm
100
4
50
17
20
depth of
inches
Mm
inches
¾
30
11
8
150
6
50
17
8
8
20
¾
30
11
8
The Object of the yarn is to centre the spigot of one pipe within the socket of the
other and to prevent the cement of joint penetrating into the pipe.
the cement mortar in 1:1 shall be slightly moistened and on no account must be soft
or sloppy and shall be carefully inserted by hand into the joints: when the cement has
been inserted it shall be punched and caulked into the joints more cement shall be
added until the space of the joint has been filled completely with caulked cement.
The joint shall be finished off neatly at the side of the socket at an angle of 450 with
the outside the pipe. Any surplus cement projecting inside the joints is to be removed
and as guard against by projection, sacks or gunny bags to be drawn past each joint
after completion. The Contractor shall be responsible that each section of the pipe is
proper cleaned out on completion of the Works.
2.3.4
2.
2.1
Measurements:
All S.W. pipes shall be measured along the centre line of pipes and fittings in running
metre between socket to socket of pipes or corresponding PVC fittings. All PVC
specials shall be paid by the numbers.
Traps/Joins/Special
C.I. Floor Trap/PVC
Floor traps shall be cast iron, or PVC deep seal with an effective seal of 300mm. All
waste pipes shall be discharged over the trap. The trap and waste pipes shall be set in
cement concert blocks firmly supported on the structural floor. The blocks shall be in
(1:2:4) and extended 37mm below finished floor level. Contractor shall provide all
necessary shuttering ad centering for the blocks.
Floor traps shall be of self-cleansing pattern conforming to IS: 2556 (XII) -1973. It
shall be symphonic type of size 110/63mm or as directed by the Project Engineer.
2.2
C.I. Fittings (Specials)/PVC Specials,
All cast iron & PVC fittings (Specials) shall be according to the relevant I.S.I.
Specifications subject to approval of the Project Engineer, free from flaw and the
interior should be clean and smooth. The fittings shall be bitumen painted smooth
inside and outside shall be painted with 3 coast of anticorrosive pain as directed by
the Project Engineer. The PVC fittings shall be PVC conforming to of class as
specified.
Cocks
All cocks shall be 15mm size of chromium plated with fancy knob head. This shall
be ego brand, Blue Star or equivalent Jaquar, ARK, and Best quality; All cocks shall
be installed as directed by the Project Engineer.
Gate Valves/Ball Vatre
Sluice valves shall be of the taper faced wedge gate type on regulated by spindles of
inside screw non-rising type. the valves shall open by movement of hand wheel
single lever or the key and bar in an anti clockwise direction. The direction of
opening shall be marked on each valve and on hand wheel fitted.
Material, manufacture, dimensions and tests of gate valves shall be in accordance
with IS; 778-1964 or other approved standards as specified in the Bill of Quantities.
All valves shall have the nominal size and maximum Working pressure or class cast
or stamped on the body of the valve.
Water Meters
Water meters shall be of the domestic type, inferential and semi-positive water meter
conforming to IS; 779- 1961.Installatin of the meter shall conform to IS: 2401-1963.
Foot Valves and Strainers
The Indian standard Specification No. 4038-1967 covers the requirements for flanged
and screwed -end foot valves of both swing and life type for use with centrifugal
pumps. Unless otherwise specified the foot valve and strainer shall comply with the
requirement in IS: 4038-1967.
Jointing shall be examined for line and level and the space left in the socket after the
yarn has been inserted shall be filled in by pouring in molten lead. The lead shall be
rendered thoroughly fluid and each joint shall be filled at one pouring. The lead used
shall be soft and free from any admixture often. The method of jointing shall be with
terre gasket and molten lead conforming to IS: 782-1966, caulked tightly home into
socket in accordance to IS: 3114-1965.
Quantity of Lead: - The quantity of lead and spun yarn for jointing cast iron pipes
shall be as specified in IS: 3114-1965, Table 1 and the quantities given are
provisional and a variation of 20% is permissible.
Nominal Size of C.I. Pipe
Up to
80mm
Lead/Joint Kg.
1.80
spun Yarn/Joint Kg.
0.10
100mm
2.20
0.18
125mm
2.60
0.20
150mm
3.40
0.20
200mm
5.00
0.30
(iii)
3.3.2
2.3
2.4
Caulking of lead joint: After a section of convenient length has been leaded
caulking shall be commenced. The surplus lead shall be free from the
leading pipe, outside the socket of the other pipe, with a flat chisel and then
caulked round three separate times with proper caulking tools of increasing
thickness and a hammer 4 to 5 lbs. in weight in such a manner as to make
the joint sound and watertight.
Flanged joints shall be made with the joint rings and nuts washers and bolts provided.
Two washers shall be used per bolt, one under the bolt head and the other under the
nut. The tightening of bolts shall be done evenly all round by tightening at one time
diametrically opposite. In no case shall excessive tightening be exerted on any nut or
bolt. After the satisfactory conclusion of the water tightness test all buried flanged
joints shall be wrapped using mastic and tape.
Miscellaneous Items
Toilet Paper Box or toilet Paper Holder
Toilet paper box shall be of white glazed vitreous china of the same colour and shade
as that of the main sanitary fixture. It shall be fixed in wall in a neat Workmanlike
manner. Recess in walls, where required, shall be provided. It shall be fix with C.P.
brass screws, where required.
2.5
2.6
2.7
2.8
2.9
2.10
2.11
PVC Pipe
Soap Tray or Soap Dish
Soap tray or soap dish shall be of white glazed vitreous China of the same colour and
shade as that of the main fixtures. Soap tray shall be fixed in wall in a neat
Workmanlike manner. Recess in walls, where required, shall be provided. It shall be
fixed with C.P. brass screws, where required.
Towel Rod
Towel rod shall be heavy type of C.P. brass with two brackets. The size of the rod
shall be s specified on the drawing or Bill of Quantities. The brackets shall be firmly
fastened by means of C.P. brass screws to wooden plugs or fawl plugs firmly
embedded in the wall.
Glass Shelf
Glass shelf unit shall be of glass of best quality with edges rounded off and shall be
free from flaws specks or bubbles. The size of the glass shelf shall 500mm x 125mm
unless otherwise specified of thickness not less than 6mm. The glass shelf shall have
C.P. brass guard rail resting on rubber washers on the glass plate and C.P. brass
brackets which shall be fixed with C.P. brass screws to wooden plugs fixed by fawl
plugs firmly embedded in the wall.
Mirror
Mirrors shall be of approved make 5.5mm thick. All edged shall be rounded off.
Mirrors shall be fixed on a backing of 6 mm thick commercial board backing and
fixed to wall with brass chromium plated screws and washers. Mirrors shall be of
beveled or beveled edge of sizes as specified in the Bill of Quantities.
Shower Rose
All materials and fittings used in construction shall conform to the latest editions of
the relevant Indian standard. The shower rose shall be of heavy chromium plated.
The size of the shower rose shall be 100mm or as specified in the bill of quantity
when measured across the diameter and the inlet connection shall be 15mm size. The
shower rose shall be round or octagonal as directed by the Project Engineer and shall
have 145 holes with a variation up to10. The diameter of each hole in the shower rose
shall be 1.2mm with a variation up to 10. The inside of the shower rose shall be
uniform and smooth in order to ensure free flow of water.
A Stop cock of specified size shall be provided to control the inlet supply of water to
shower rose. The stop cock shall be heavy chromium plated or as specified in the bill
of quantity or as directed by the Project Engineer. The shower rose shall be fitted
with the 15mm dia. G.I. pipe with a 90 0 bend at top. The height of the rose when
fitted shall be 120cm from the floor.
C.P Grating
Floor and urinal traps shall be provided with chromium plated grating, with rim of
approved design and shape. Minimum thickness shall be 3mm.
C.P. Fittings
All C.P. fittings, additional bib cocks, shall be of the best quality heavy pattern of
approved make.
All C.P. fittings shall be fixed in a Works man like manner and shall not carry tool
marks and scratches.
4C/ Anti clockwise top- provided with steel with grating approval by Project
Engineer.
-
waste soil and vent pipe line heaving Polly chloride (in PVC) pipes and fittings confirming to
NS or ISR of approved make of the following sizes in PVC cement solvent and or gasket joints
in chiding clean, outs, cutting the pipes to the acquired lengths and fixing pipes sleeves is the
wall, including making holes/pocketsize walls or floor and making god the same to the original
condition, testing the pipe line by smoke, Test, Rectifying the leakage, if any all complete as
directed.
OD 50 mm (4.0 Kg f / sq cm)
OD 75 mm (4.0 kg f / sqm
OD 110 mm (4.0 kg f /sq m)
Measurement - All PVC pipe measure along the centre line of pipe and all PVC specials shall be
paid by the number.
Solar water heater:
Specification by number
1. 200 lit capacity with 3 panels.
2. Solar panel size - 3' x 6'
3. Internal boiled shall be made M.S. tank with 10 gauge with cement lining.
4. 4" glass wool insulation between solar boilers with outside cover.
5. 9 nos. of G.I. pipe in solar panel.
6. 4 mm glass thickness (single)
7. Test pressure 50 lbs/ sq. inches or as directed by Project Engineer. The solar shall
be free from damage.
Insulation:
Insulation for hot water pipe shall be 6.5 mm wall thickness as directed by Project Engineer.
ELECTRICAL SPECIFICAITON
1.
ELECTRICAL INSTALLATION WORKS
General
The following specifications will apply under all circumstances to the equipment to be
installed against this Agreement and it is to be ensured that the Developer, shall obtain for
himself at his own expense and on his own responsibility all the information which may be
necessary for purpose of making the tender and for entering into a Agreement keeping in view
the specifications detained hereunder, drawing, and designing of the electrical installation and
inspection of Site.
The rates shall include for the cost of material erection, commissioning, labor, supervision,
tools, plant, transport, all taxes, contingencies, breakage, wastage, sundries, scaffolding,
maintenance of wiring for one year etc. i.e. they should be for an item complete in all respect.
Workmanship and good appearance of the installation shall be of equal importance with its
electrical and mechanical efficiency, and all portions of the work shall be so laid out and
installed that the Work as a whole is of uniform quality and shall present a neat and
mechanical appearance in a manner meeting the approval of the Project Engineer. The
Developer shall verify in the field all measurements necessary for the electrical Work and
shall assume responsibility for their accuracy.
Materials which are defective or damaged during the progress of Work shall be replaced or
repaired in an approved manner at the expense of the Developer. The installation shall comply
with all applicable laws and ordinances and with the requirements of the B.S. or Indian Codes
and as specified herein or shown in the Drawings. The progress of the electrical work shall be
carried out so as to conform the progress of the Work of the other trade and the entire
installation shall be completed as soon as the condition of the building with permit.
All cutting, drilling, chiselling, patching, etc., required for installation of electrical shall be
carried out in a manner approved by the Project Engineer. Any deferring of finish, planning,
woodwork, metal work, masonry, concrete or other material, resulting from the performance
of the Work shall be replaced or repaired at no expense to the owner and to the satisfaction of
the Project Engineer.
Site Condition
The equipment materials to be erected and commissioned should be suitable for the Site
conditions. It is estimated that the maximum temperature and humidity at the site will be 40
deg. C and 98% respectively.
Scope of Works
Provide all labor, materials, equipments, transportation and operation and tests necessary for
and incidental to the completion and operation of the complete Electrical System, Telephone
as required and as specified herein or shown on the Drawing.
a)
Complete Electrical Installation including underground line, Main Panel Boards etc. as
detailed in the Bill of Quantities.
a)
Complete Lighting and Power Wiring Systems and Earthing Systems
b)
Lighting and Power Panel Boards, Switchboards.
c)
Lighting Fixtures, Switches, Outlets, Conduits, etc
d)
Excavation rock fill, cutting and patching main Work and contain Work, sleeves,
inserts, anchor, etc. as required for proper installation in accordance with the
requirements, drawings and specifications.
e)
f)
g)
h)
Provide for installation of other miscellaneous electrical wiring required for all
plumbing, electronic and mechanical equipment, complete as shown on the Drawings
and as specified herein.
Complete telephone internal and external cable network, plug in outlets and distribution
panels.
Installation and testing of motor control panels to be used for pumps.
Where the Electrical Work is associated with the Work of others, the Developer shall
confer with the persons affected, and shall furnish them with necessary information,
drawings, dimensions etc. and shall coordinate the electrical work with the Work of
other trades to ensure a satisfactory installation, in accordance with the Drawings and
Specification and with the highest standards of trade practices based on IS Codes of
Practices.
Standards
The installation shall generally be carried out in conformity with the 'Indian Code of Practice'
for electrical wiring and fitting in building and for the electrical equipment on buildings. All
materials and equipment to be supplied should conform to the relevant Indian Standard
Specification. Where no specification is available for any materials or equipment, it shall be
governed by specific approval of the Project Engineer.
I.S.
Specifications
The following Indian Standard Specifications will apply to the equipment and the Agreement:
(a)
Low tension air circuit breakers
:
IS 2516 -1965 Part I Selection
I.
(b)
Switch fuse units on cubicle switch boards :
IS 4047 - 1967
(c)
Switch fuse units on Industrial Boards etc.
(d)
Switch gear bus bars
: IS 375 - 1963
(e)
H.R.C. fuse link
:
IS 2208 - 1963
(f)
Distribution fuse boards
: IS 2675 - 1966
(g)
Enclosures for low voltage switch gear
:
IS 2147 - 1962
(h)
PVC Cables
: IS 1554 - 1964
(i)
Tubular fluorescent lamps for general
lighting service
:
IS 2418 - 1965
(j)
Tungsten filament lamps for general service :
IS 418 - 1963
(k)
Ceiling fans
: IS 374 - 1966
(l)
Flood lights
: IS 1947 - 1961
(m)
Flame proof electrical
lighting fittings
: IS 2206 - 1962(Part I )
(n)
Industrial light fittings
with metal reflectors :
IS 17 - 1961
(o)
Water tight electric light fittings
: IS 3553 - 1968
(p)
Switch socket outlets
: IS 4615- 1968
(q)
Three pin plug and socket outlets
: IS 1293 - 1967
(r)
Switches for domestic and similar purpose :
IS 3854 - 1966
Codes of Practices
Earthing
: IS 3043 - 1966
Electrical wiring installation
: IS 732 - 1963
Switchgear
: IS 3072 - 1965(Part I)
Lighting Protection
: IS 2309 - 1960.
Materials
All materials and equipment shall be new and shall be in accordance with the standards as
established by the Indian Standard Institute or the requirements of the B.S. Where materials
or equipment are specified or shown on the Drawings by name of manufacturers, they shall be
used. Equipment or material of other manufacturers may be considered for use if equal quality
appearance, and electrical and mechanical characteristics and approved by the Project
Engineer.
Power Supply
The power supply system is alternating current 3 phase with neutral at a frequency of 50
cycles per second and 400/230 V.
a) Main Power Control Panel Board
Main power control panel shall be made of folded steel sheet 1.6 mm thick with thrust
protection and anticorrosion painting. They shall be installed in the electric room as shown on
the drawings.
The low voltage distribution switchboard serving to control and protect the L.V. outgoing
distribution boards shall be manufactured and tested in accordance with the provisions of I.S.
and the relevant. It shall be provided with a pressure resistant two-wing door and a detachable
plate of structural material in the cable termination space.
(b) Busbars
Each L.V. panel shall comprise five busbars: three for the phases, one for the neutral and one
for potential equalization (ground). Busbars shall be made of hard drawn high conductivity
electrolytic copper according to Indian standard. They shall be air insulated, of dimensions
and short circuit rating as shown on the drawings.
(c)
Moulded Case Circuit-Breakers
The moulded case circuit-breakers shall be manufactured according to IEC 157 or
equivalent and shall have the following characteristics.
Rated voltage
: 400 V
Nominal current rating
:
150 A, 100A, 40 A, 60 A as
shown on the drawings
Nominal frequency
: 50 Hz
Breaking capacity (rms)
:
20 KA for 150 A and 10 KA
for lower
Number of poles
: 3
Total break-time
: 20 ms
The switch disconnectors shall consist of a fully enclosed housing fabricated from nontracking, heat resistant insulating material, accommodating the silver plated fixed and movable
contacts.
The movable contacts shall be driven by a robust switching mechanism with quick make-andbreak operation.
Handle complete with position indication shall be provided, the protection class, shall be
according to IS.
(d)
Ammeters:
Ammeters shall be of 96 X 96 mm size with quadrant scale, scaled according to the
corresponding current transformer rating and shall have the following characteristics:
-
Mechanism
Tolerance
Maximum current
Frequency range
Scale graduation
:
Moving iron
:
Class 1.5
:
5A
:
15 to 65 Hz
:
Starting at about one fifth of
full scale value.
Overload capacity
:
1.2 times continuously, 50
times for sec., 4 times for 2 or
3 min, 2 times for about 10
min.
Ammeters shall be connected through current transformers.
(e)
Voltmeters
Voltmeters shall be of 96 X 96 mm size with quadrant scale, scaled 0 - 500 V with
built-in series to the rear of the indicator, having the following characteristics:
Mechanism
:
Moving coil
Tolerance
:
Class 1.5
Frequency range
:
15-65 Hz
Scale graduation
:
Starting at about one fifth of full scale
value.
Overload capacity
:
2 times for 1 min
The measuring of voltage for each phase shall be affected through one five-way voltmeter
selector switch.
(f)
Miscellaneous
Before dispatching from the factory, all components of the main low voltage
distribution switchboard shall be subjected to the routine tests specified in relevant
Indian Standards, or equivalent.
Furthermore certificates issued by a testing organization selected by the Project
Engineer shall be submit to the Project Engineer by the Developer proving that the
types of the components to be supplied have passed the type tests prescribed in the
relevant British Standard or equivalent.
Prior to ordering the relevant equipment the Developer shall submit to the Project
Engineer for approval information and data stated in the relevant British Standard or
equivalent as regards the components for the distribution board.
Distribution Boards
1.
This section comprises of surface/recess type Distribution Boards complete with
required miniature circuit breakers (MCB).
2.
These Distribution Boards with enclosures, bus bars, neutral links, and earth links,
shall be of the original manufacturers only as indicated in the approved lists.
3.
The D.Bs' shall be duly connected with the wire way ducting or conducts to make it
electrically and mechanically continuous with the help or sockets bushes, or flange
plates, as desired by the Project Engineer.
4.
All D.B.'s shall be required to be connected with incoming sub-main cable and
outgoing circuit wiring with Dowel's or approved equivalent crimping lugs for wires
of 6 sq. mm. or bigger sizes cables lugs shall be crimped with proper tools at Site.
Rates quoted by the Developer shall include the connections
in the D.B.'s.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
D.B.'s shall be fixed on the walls/or flush with wall (recessed) in approved manner
and damage to wall made good as per original.
Damage to the original paint to the D.B.'s if any, shall be made good as desired by
the Project Engineer.
D.B.'s shall be dust and vermin proof. These shall have hinged cover and MCB's
shall not be openable without opening these covers. Phase barrier and shrouding
sheets shall also be provided in D.B. The D.B. shall be fabricated of 16 SWG CRCA
sheet steel and shall be stove enamel painted.
Blank spaces (spares) shall be covered with blanking plate.
The breaker shall have quick break trip free mechanism with thermal over load and
magnetic short circuit tripping devices. The mechanism shall be such that the circuit
can not be held closed against a fault. The thermal items shall prevent reclosing of a
circuit when a fault or over load persist.
The contact shall be silver tungsten or other suitable material to give long contact
file. Multiple unit shall have common inter tripping mechanism.
Miniature Circuit breakers in the panels shall have phase sequence numbering. The
phase to which each single pole branch is connected shall be clearly indicated and so
arranged that any three adjacent branches are connected to phase R,Y and B
respectively and the same relationship of phase sequence is maintained.
Each MCB shall have fault current of 9 KA for 6 A and 16 A load at 220 V supply
system.
Circuit Diagrams of each D.B. shall be stuck to over cover of the D.B. which shall
clearly identify circuit number
and connected load points.
Approved M.C.B. Distribution Board names are: Hyonjan Engineering, M.K Metal
LV Cable
Single core, four core, or five core, as shown on the drawing, copper conductor, PVC
insulated, PVC sheathed, single wire armored and PVC served, 0.6/1 KV rated cables shall be
used in the low voltage distribution system. The
cable shall comply with IS or equivalent
and have the following technical characteristics.
Number of cores: 4 or 5 for three phase systems 2 or 3 core for single-phase systems.
Rated voltage: 0.6/1 KV
Neutral of distribution system solidly earthen.
Cross-section of copper conductors as shown on the drawings.
Cable shall withstand a continuous copper temperature of 75 oC.
The Cable shall consist of:
Shaped standard copper conductors
PVC insulation
Layer of extruded PVC
Galvanized steel wire armor.
The conductors shall be stranded with successive layers of plain annealed wires, drawn from
electrolytic copper of high conductivity meeting the requirements of BS 6360. In the
stranding and shaping process, each conductor shall be prespiralled to the lay of the finished
cable, so the cores will automatically bed in their correct relative position when laid up.
Conductors shall have smooth contour, free from sharp edges or projections, which could
damage the insulation or cause high local electrical stresses. Number and diameter of wires
shall be according to IS.
The cables shall be sheathed over the laid-up cores by a layer of extruded PVC complying
with IS or equivalent.
The amour shall consist of a single layer of galvanized steelwires complying with IS or
equivalent. The diameter of the amour wire shall be in accordance with IS.
Cable Laying
Laid Underground: Where cables are laid underground they shall be laid in a trench 0.9l m
deep from the general ground level. The problem of the trench shall be levelled and the cable
shall be laid on a 7.62 cm bedding of fine chemically inert, sand. Mechanical protection shall
be given with single layer of well burnt bricks on sides with concrete tiles on top, the inside
cavity being filled with sand so that at least a 5.08 cm layer of sand remains on top of the
cable. The concrete tiles shall be interlocking type with the word "DANGER" impressed on
top. Back filling shall be done with well rammed and watered earth. Cast from cable markers
shall be placed so as to be visible on the surface at suitable intervals and at every bend.
Wherever cables run through or enter the building, crosses road or drain, CI sleeves pipes of
approved diameter shall be provided.
The rates quoted shall include trenching, giving protection, sleeving and clamping, including
supply of all materials as specified above.
Wherever cables are to run along wall surface of either the building or electrical duct or on the
ceiling, these shall be
fixed with clients. Clients shall consist of moulded insulated
materials divided in two halves flat steel of suitable approved section. The securing shall be
by means of studs and nuts with lockouts and washers. For PVC armored cables, aluminum or
GI claw type clamps may be used.
The raises quoted shall include supply and installation of all fixing materials specified above.
Laid in ready trench: This will mean laying of cable in ready prepared trenches directly on
trench floor. Minimum bending radius shall be twelve times the overall cable diameter in case
of APLSTS cables and six times for PVC armored cables if not otherwise recommended by
the Project Engineer.
The lengths of cables given in the schedule of quantities are only approximate. The successful
Developer is required to measure out the actual lengths needed before laying. Straight though
joints will not generally be permitted.
Jointing: Cable jointing shall be carried out by skilled jointers with expert supervision. The
Developer shall use the best jointing materials and the necessary cable compound and all
jointing, sweating, basting, wiping and filling in of compound shall be done in an approved
manner. In case of aluminum conductor cable special care should be taken for its marked
difference from copper conductor cable.
For PVC cable standard compression type tinned brass glands shall be used.
i)
Wiring System
(a)
Concealed Point wiring shall consist of branch wiring for final subdistribution board
together with the controlling switch (or push) as far as and including the ceiling rose
or any other approved terminations or socket outlet..
(b)
A three pin socket outlet point shall include the earth continuity base copper
conductor cable of 3/20 swg Cu. wire from the earth pin to the terminal or bus at the
final distribution center.
Wiring shall be done in "looping system" and phase or live conductor shall be looped
at switch box and neutral conductor can be looped from light, fan, or socket outlets.
In estimating the current to be carried out by any conductor, incandescent lamps, shall be rated
at 100 watts, the ceiling fans shall be rated at 80 watts, table fans and ordinary socket points at
60 watts, fluorescent lamps of 4 ft at 50 watts and 2 ft at 25 watts and power socket outlet at
1000 watts, unless the actual values are specified.
ii) Lights fans, and socket outlet may be Worked on a common circuit. Such sub-circuits shall
not have more than a total of 10 points of lights, fans and sockets outlets. The load of such
circuits shall be restricted to 1200 watts. The number of socket outlets shall not be more than
four per circuit.
As regards power sub-circuits, the outlet shall be provided according to the load design for
these circuits, but in no case shall these be more than four outlets on each circuit.
Rates:
The rates for wiring light, fan and all plug points given in the schedule of Work attached with the
tender, shall be irrespective of the length of points. Circuit wires of these points shall also from
part of the point rate. The conductor for final sub-circuit for points shall have a nominal cross
section area not less than 2.5 sq. mm. (Copper conductor for light and fan circuit and 4 sq. mm for
power sub-circuit in case of general light and power wiring).
(a)
The Developer shall prepare fabrication and detailed working drawings and obtain
the approval. All Work shall be carried out only on approval of these drawings.
However, approval of the drawings does not relieve the Developer of his
responsibility to meet with the intent of the specification.
The Developer shall also submit complete layout drawings on completion of the
work. The rate quoted by the Developer shall be inclusive of this Work. These
drawings must give the following information.
Runs of PVC conduits and number of wires contained in circuits and size of wires for
point wiring.
(b)
Location of all distribution boards, main switches, junction and pull boxes and fuses;
Complete schematic diagram of the installation;
(c)
Location of earthing stations. The virtual completion certificate will not be issued till
the drawings are submitted.
Position of Lighting, Distribution Boards and Switch Gears
(d)
Should there by any discrepancy or incomplete description ambiguity or omission in
the drawings and other documents, whether original or supplementary forming the
Agreement, the Developer shall immediately on discovering the same, draw attention
of the Project Engineer.
(e)
Before commencement of Work, the exact final position of all points switch boxes
and the distribution boards shall be ascertained by the Developer from the Project
Engineer.
Sampling:
The Developer shall submit 2 sets of samples of accessories and apparatus, he propose to use
in the installation, to the Project Engineer for approval. Drawings or samples, as required
shall be submitted by the Developer and this specification shall not be departed from without
any written instructions from the Project Engineer. The verbal approval given by the Project
Engineer to any drawings or samples submitted by the Developer shall in no way exonerate
the Developers from their liability to carry out the Work in accordance with the terms of the
Agreement.
Earthing
Earth Installation: The entire electrical network shall be solidly and effectively earthen
vigorously following the methods as per I.S. 3043 - 1966.
The Site for earth stations shall be selected as close to the sub-station or switch room as
possible. The Site so selected shall have to be moist with a tendency to remain water-logged
even during the driest season of the year. Such places can be located near the drain outlet
from the main building. The earth pit shall be one meter square and 2 m deep 600mm x
600mm x 6 mm electrolytically pure copper plate shall be used as earth electrode which shall
be laid vertically from the base of the pit. The earth lead from the electrode shall be 8 swg
copper conductor as specifies which has to be brazed with the electrode to sustain flow of
heavy current without effecting the brazing during heavy fault conditions. In order to improve
the conductivity of the soil, common salt and charcoal shall be used to required quantity to
cover the electrode before refilling the pit. The earth resistance then shall have to be
measured and it must remain as close as 5 ohm. If this value is not reached the other pits shall
have to be dug and be repeated the similar process and connect the earth stations in parallel till
the required value of the earth resistance is obtained.
Following separate and independent earthing installations shall be completed in the entire
electric system of the project Site referred herein:
(a)
Main power control panel earthing
:
1 point
(e)
Lighting protection ring eartling
:
1\4 to 6 points
Detail Working drawings be prepared and approval of the Project Engineer to be obtained
prior to commencing the Earthing Installation (Grids) system.
Testing of Installation
Insulation Resistance
i) The insulation resistance shall be measured by applying between earth and the whole system
of conductors or Any section thereof with all fuses in places an all switches closed, and except
in earthen concentric wiring and all lamps in position or both poles of the installation
otherwise electrically connected together, a direct current pressure of less than twice the
working pressure provided that it need not exceed 500 volts for medium voltage circuits.
Where the supply is derived from the 3 wire (A.C. or D.C.) or a poly phase system, the neutral
pole of which is connected to earth either direct or through added resistance, the working
pressure shall be deemed to be that which is main trained between the outer or phase
conductor and the neutral.
ii)
The insulation resistance measured as above shall be not less than 50 divided by the
number of points on the circuit provided that the whole installation shall not be
required to have an insulation resistance greater than one megaohm.
iii)
Control rheostats, heating and power appliances and electric signs may, if required,
be disconnected from the circuit during the test, but in that event the insulation
resistance between the code or frame work, and all live parts of each rheostat,
appliances and sign, shall be not less than that specified in the relevant Indian
Standard Specification or where there is no such specification shall be not less than
half a megohm.
iv)
The insulation resistance shall also be measured between all conductors connected to
one pole or phase conductor of the supply and all the conductors connected to the
middle wire or the neutral or to the other pole or phase conductors of the supply and
its valve shall be not less than that specified in sub-clause (ii).
On completion of an electric installation (or an extension to an installation) a
certificate shall be furnished by the Developer counter signed by the certified
supervisor under whose direct supervision, the installation was carried out. This
certificate shall be in the prescribed from as required by the local Electric Supply
Authorities.
v)
(b) Testing of Earth Continuity Path
The earth continuity conductor including metal conduits and metallic envelopes of cables in
all cases shall be tested for electric continuity and the electrical resistance of the same along
with the earthling lead but excluding any added resistance or earth leakage circuit breaker
measured from the connection with the earth electrode to any point in the earth continuity
conductor in the completed installation shall not exceed one ohm.
(c) Testing of Polarity of Non-linked Single Pole Switches
i)
In a 2 wire installation of test shall be made to verify that all non-linked single pole
switches have been fitted in the same conductor throughout and such conductor
shall be labeled or marked for connected to an outer or phase conductor or to the
non-earthen conductor of the supply.
ii)
In a three wire or a four wire installation, a test shall be made to verify that every
non-linked single pole switches fitted in a conductor which is labeled or marked for
connection to one of the outer or phase conductor or the supply.
The Developer shall be responsible for providing the necessary instruments and
subsidiary earth for carrying out the test. The earth continuity tests shall comply
with the IS specifications as may be applicable. Should the above tests not comply
with the limits laid down, the Developer shall rectify the faults until the required
results are obtained.
Testing:
All systems shall be tested in accordance with I.S. code of Practice for lighting
protection, as well as I.S. Code of Practice for earthling.
The resistance from any point of the system to earth shall not exceed to ohms.
The resistance of each metallic conducting path, including all joints shall not exceed
the calculated resistance of the tape itself by more than six percent.
In addition, the resistance from the earth electrode to the nearest test clamps shall not
exceed 0.2 ohms.
2.
3.
4.
5
6
7
Prices shall remain firm and free from variation due to rise and fall in the cost
materials and labor or any other price variation whatsoever whether during the
stipulated period of execution or during extended period of completion if any, except
direct statutory, increase by the act of Govt. or local Bodies.
Item rates shall remain valid for any variations in the estimated quantities given in
the schedule of qualities.
In order to facilitate the technical scrutiny of various quotations, the tender must
supply with their quotations detailed technical particulars, make, catalogues and
erection drawings for various items under different parts specified in the schedule of
quantities.
The power supply shall be 3 phase, 4 wire, 400/230 volts A.C. and frequency of 50
cycles, per second. All consuming devices shall be suitable for the voltage and
frequency mentioned above.
The drawings and specifications lay down minimum standard of equipment and
workmanship and deviations, if any, shall be clearly set down in Annexure-I. In the
absence of any deviations, it will be deemed that the tender is fully satisfied with the
intents of the specifications and drawings and their compliance with the statutory and
fire insurance provisions including local codes. Where the drawings and
specifications conflict, the more stringent shall apply.
All equipment and the installation shall be tested as specified and a test certificate in
the prescribed from as required by the local supply authorities shall be furnished.
The entire installation shall be guaranteed against defective material or workmanship
for a period of 12 months from the date the installation has been certified by the
Project Engineer and taken over by the owner. During the guarantee period, all the
defects shall be rectified by the Developer, free of cost.
8
9
10
11
12
13
15.
16.
17.
18.
The successful tender shall submit the drawings for all the LT boards to the Project
Engineer for approval. The approval of these drawings will be general and will not
absolve the Developer of the responsibility of the correctness of these drawings. At
least 3 copies of the approved drawings shall be supplied to the Project Engineer for
their distribution to various agencies at Site at no cost to the Project Engineer.
The successful Developer shall arrange water and power connections required for the
Work at his own cost. The Developer shall also install tested meters at his own cost.
The Developer shall pay the actual consumption at the supply company/agency rates.
The tenders must see the Site conditions and take all the aforesaid and foregoing
factors while quoting the rates, as no extra will be allowed on any ground arising out
of or relating to the aforesaid and foregoing.
The successful Developer shall include in his rates for painting with 3 coats of
synthetic enamel paint to match the surroundings or as directed by the Project
Engineer for all down rod hangers pertaining, to light fixtures fans etc.
he Developer shall supply completion drawings of the entire installation on a tracing
cloth showing the complete wiring diagram as executed at Site drawn to scale
approved by the Project Engineer after the completion of Work but before
completion certificate is given by the Project Engineer.
After laying and jointing the cables shall be subject to necessary tests as stipulated in
IS No. 5959 (Part -I), 1970.
The materials of the 1st preference shall be used and the Developer may excuse
himself of not doing so only, if the required range, as per tender specifications, is not
manufactured by the particular manufacturer. The evidence of such case shall be
supported by a letter from the respective manufacturer. All samples of all electric
fittings and other accessories shall be approved by the Project Engineer prior to their
installation.
In case where this specification and the description in the Schedule of Quantities
differ, the Work shall be carried out, as detailed in the schedule of quantities.
No alternation whatsoever is to be made to the text or quantities of this schedule of
quantities, unless such alteration is authorities in writing by the Architects. Any such
alteration or additions shall, unless authorize in writing, be disregarded when tender
documents are considered.
Any error in description or in quantity or omission of items from the Agreement shall
not vitiate this Agreement but shall be corrected and demand to be a variation
required by Project Engineer.
All measurements shall be taken in accordance with the Indian Standard Electrical
Installation in Buildings Method of Measurements of IS: 5808:1770, unless
otherwise specified.
COMPUTER AND ACCESSORIES SPECIFICAITON
1.
2.
MULTIFUNCTION DEVICE
Function
Print, Scan, Copy
Print
Print Speed up to 19 ppm
Resolution
600x600dpi
First Print out time less than 11 second
Copy
Copy Speed up to 19 cpm
Resolution
600x600dpi
First Print out time less than 11 second
Zoom 50 to 200%
Multi copy
1 to 99 pages
Copy Features ID Copy, 2-up, Auto-fit, Clone, Poster copy
Scan
Compatibility TWAIN standard, WIA standard
Method color CIS
Resolution (Optical) up to 600 x 2,400 dpi
Resolution (Enhanced) up to 4,800 x 4,800 dpi
Scan to PC
Paper Handling
Media Type plain, thin, OHP, label, card, thick, bond,
envelope, color paper, preprinted
Input Capacity and Types 250-sheet cassette, 1-sheet manual
tray
General
LCD 2 line x 16 characters
Memory / Storage minimum 8 MB
LAPTOP COMPUTER with Carrying Case, optical mouse
Processor
Intel® Core™ i3-330M Processor
Operating system
Genuine Windows XP Professional (32-bit, SP3) with
Recovery Media for Genuine Windows 7 Professional
Memory
2GB DDR3 1066MHz memory
Display size
15.6" widescreen
Hard Drive
250GB HDD (5400rpm)
Inputs
Standard US keyboard with 10-key pad, TouchPad pointing
device
and
Controls
USB
3-USB (2.0), 1-eSATA/USB (2.0) combo port with Sleep and
Charge
Battery
Li-Ion (55Wh, 6-Cell or more)
AC Adaptor
75W (15V 5.0A) Auto-sensing, 100-240V / 50-60Hz input
LAN
Intel® 82577LC Gigabit Network Connection
Wireless LAN
Wi-Fi® Wireless networking (802.11b/g/n)
Optical Drive
DVD-SuperMulti drive (+/-R double layer)
Antivirus software
Original 3 users antivirus software with 1 year licence
3.
DESKTOP COMPUTER
Processor
Intel® Core2 duo Processor 2.5GHz or more
Operating system
Windows XP Professional
Memory
2GB DDR2 1066MHz memory or more
Monitor
18.5" LCD or larger
Hard Drive
3200GB HDD (5400rpm)
Inputs
Standard US keyboard with 10-key pad, TouchPad pointing
device
and
Controls
USB
3-USB (2.0), 1-eSATA/USB (2.0) combo port with Sleep and
Charge
UPS
1200VA
Casing
ATX Casing
LAN
Integrated 10/100 Network Adaptor
Optical Drive
DVD-RW drive
Software
Original 3 users antivirus with 1 year licence
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