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USACE / NAVFAC / AFCEC / NASA
UFGS-46 53 62 (February 2011)
Change 1 - 08/14
-------------------------Preparing Activity: USACE
Superseding
UFGS-44 42 59 (April 2006)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2016
**************************************************************************
SECTION TABLE OF CONTENTS
DIVISION 46 - WATER AND WASTEWATER EQUIPMENT
SECTION 46 53 62
CONTINUOUS LOOP REACTOR WASTEWATER TREATMENT SYSTEM
02/11
PART 1
1.1
1.2
1.3
1.4
PART 2
GENERAL
REFERENCES
SUBMITTALS
DELIVERY, STORAGE, AND HANDLING
EXTRA MATERIALS
PRODUCTS
2.1
SYSTEM DESCRIPTION
2.1.1
Design Requirements
2.1.2
Mixing Parameters
2.1.3
Aeration Parameters
2.2
MANUFACTURED UNITS
2.2.1
Standard Products
2.2.2
Nameplates
2.2.3
Protection of Moving Parts
2.3
MATERIALS
2.3.1
Steel Plates, Shapes and Bars
2.3.2
Pipe
2.3.2.1
Steel Pipe
2.3.2.2
Ductile-Iron Pipe
2.3.2.3
Polyvinyl Chloride (PVC) Pipe and Fittings
2.3.3
Pipe Hangers and Supports
2.3.4
Valves
2.3.4.1
Gate Valves
2.3.4.2
Plug Valves
2.3.4.3
Check Valves
2.3.5
Joint Compound
2.3.6
Joint Tape
2.4
DISC AND ROTOR AERATORS
2.4.1
Aeration Mechanism
2.4.1.1
Disc Assembly
2.4.1.2
Rotor Assembly
2.4.1.3
Velocity Baffles
SECTION 46 53 62
Page 1
2.4.1.4
Splash Plates
2.4.1.5
Disc and Rotor Immersion Requirements
2.4.1.6
Shafts and Bearings
2.4.1.7
Protective Covering
2.4.2
Drive System
2.4.2.1
Reducer
2.4.2.2
Housing
2.4.2.3
Rating
2.4.2.4
Bearings
2.4.2.5
Lubrication
2.4.2.6
Couplings
2.4.3
Mounting
2.5
LOW SPEED SURFACE AERATORS
2.5.1
Impeller Shaft
2.5.2
Impeller
2.5.3
Drive System
2.5.3.1
Reducer
2.5.3.2
Housing
2.5.3.3
Rating
2.5.3.4
Bearings
2.5.3.5
Lubrication
2.5.3.6
Couplings
2.5.4
Mounting
2.5.5
Protective Covering
2.6
SUBMERGED TURBINE DRAFT TUBE AERATORS
2.6.1
Impeller Shaft
2.6.2
Impeller
2.6.3
Drive System
2.6.3.1
Reducer
2.6.3.2
Housing
2.6.3.3
Rating
2.6.3.4
Bearings
2.6.3.5
Lubrication
2.6.3.6
Couplings
2.6.4
Draft Tube
2.6.5
Mounting
2.6.6
Air Supply Equipment
2.7
JET AERATION
2.7.1
Submerged Jets
2.7.2
Recirculation Pumps
2.7.2.1
Vertical Propeller Pump
2.7.2.2
Submersible Centrifugal Pumps
2.7.2.3
Self-Priming Centrifugal Pumps
2.7.2.4
Vertical Turbine Pumps
2.7.2.5
Pump Suction Screens
2.7.3
Blowers
2.8
DIFFUSED AERATION/SLOW SPEED MIXER SYSTEM
2.8.1
Diffused Aeration System
2.8.2
Slow Speed Mixer (With Submersible Electric Motor)
2.8.2.1
Mixer Propeller
2.8.2.2
Drive System
2.8.2.3
Shafts and Seals
2.8.2.4
Mounting
2.8.3
Slow Speed Mixer (With Hydraulic Motors)
2.8.3.1
Mixer Propeller
2.8.3.2
Drive System
2.8.3.3
Mounting
2.9
LUBRICATION REQUIREMENTS
2.10
ELECTRIC MOTORS
SECTION 46 53 62
Page 2
2.10.1
Frame
2.10.2
Design
2.10.3
Enclosure
2.10.4
Terminal Boxes
2.10.5
Bearings
2.10.6
Windings
2.10.7
Motor Characteristics
2.10.8
Motor Controls
2.11
SPECIAL TOOLS
PART 3
EXECUTION
3.1
EXAMINATION
3.2
TREATMENT SYSTEM INSTALLATION
3.2.1
Welding
3.2.2
Pipe and Valve Installation
3.2.2.1
Flanged Joints
3.2.2.2
Screwed Joints
3.2.2.3
Push-On Joints for PVC Pipe
3.2.2.4
Solvent-Weld Joints for PVC Pipe
3.2.2.5
Valves
3.2.3
Equipment Installation
3.2.4
Electrical Work
3.3
PAINTING
3.3.1
Preparation and Application
3.3.2
Coating Examination
3.3.3
Coating Repair
3.4
FRAMED INSTRUCTIONS
3.5
FIELD TESTS AND INSPECTIONS
3.5.1
Basin Leakage Test
3.5.2
Operating Tests
3.5.3
Velocity Test
3.5.4
Standard Oxygen Transfer Efficiency Test (S.O.T.E.)
3.5.5
Reporting Test Results
3.6
MANUFACTURER'S SERVICES
3.6.1
Supervise Installation, Adjustment, and Testing
3.6.2
Field Training
3.7
OPERATING AND MAINTENANCE INSTRUCTIONS
-- End of Section Table of Contents --
SECTION 46 53 62
Page 3
**************************************************************************
USACE / NAVFAC / AFCEC / NASA
UFGS-46 53 62 (February 2011)
Change 1 - 08/14
-------------------------Preparing Activity: USACE
Superseding
UFGS-44 42 59 (April 2006)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2016
**************************************************************************
SECTION 46 53 62
CONTINUOUS LOOP REACTOR WASTEWATER TREATMENT SYSTEM
02/11
**************************************************************************
NOTE: This guide specification covers the
requirements for continuous loop reactor wastewater
treatment system.
Adhere to UFC 1-300-02 Unified Facilities Guide
Specifications (UFGS) Format Standard when editing
this guide specification or preparing new project
specification sections. Edit this guide
specification for project specific requirements by
adding, deleting, or revising text. For bracketed
items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in
respective project, whether or not brackets are
present.
Comments, suggestions and recommended changes for
this guide specification are welcome and should be
submitted as a Criteria Change Request (CCR).
**************************************************************************
PART 1
1.1
GENERAL
REFERENCES
**************************************************************************
NOTE: This paragraph is used to list the
publications cited in the text of the guide
specification. The publications are referred to in
the text by basic designation only and listed in
this paragraph by organization, designation, date,
and title.
Use the Reference Wizard's Check Reference feature
when you add a RID outside of the Section's
Reference Article to automatically place the
reference in the Reference Article. Also use the
Reference Wizard's Check Reference feature to update
SECTION 46 53 62
Page 4
the issue dates.
References not used in the text will automatically
be deleted from this section of the project
specification when you choose to reconcile
references in the publish print process.
**************************************************************************
The publications listed below form a part of this specification to the
extent referenced. The publications are referred to within the text by the
basic designation only.
AMERICAN BEARING MANUFACTURERS ASSOCIATION (ABMA)
ABMA 11
(2014) Load Ratings and Fatigue Life for
Roller Bearings
ABMA 9
(2015) Load Ratings and Fatigue Life for
Ball Bearings
AMERICAN GEAR MANUFACTURERS ASSOCIATION (AGMA)
ANSI/AGMA 6013
(2006A; R 2011) Standard for Industrial
Enclosed Gear Drives
ANSI/AGMA 6113
(2006A; R 2011) Standard for Industrial
Enclosed Gear Drives (Metric Edition)
AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)
ASCE 2-06
(2007) Measurement of Oxygen Transfer in
Clean Water
AMERICAN WATER WORKS ASSOCIATION (AWWA)
AWWA C110/A21.10
(2012) Ductile-Iron and Gray-Iron Fittings
for Water
AWWA C111/A21.11
(2012) Rubber-Gasket Joints for
Ductile-Iron Pressure Pipe and Fittings
AWWA C115/A21.15
(2011) Flanged Ductile-Iron Pipe With
Ductile-Iron or Gray-Iron Threaded Flanges
AWWA C151/A21.51
(2009) Ductile-Iron Pipe, Centrifugally
Cast, for Water
AWWA C200
(2012) Steel Water Pipe - 6 In. (150 mm)
and Larger
AWWA C500
(2009) Metal-Seated Gate Valves for Water
Supply Service
AWWA C504
(2010) Standard for Rubber-Seated
Butterfly Valves
AWWA C508
(2009; Addenda A 2011) Swing-Check Valves
for Waterworks Service, 2 In. (50 mm)
Through 24 In. (600 mm) NPS
SECTION 46 53 62
Page 5
Cements for Poly(Vinyl Chloride) (PVC)
Plastic Piping Systems
ASTM D3139
(1998; R 2011) Joints for Plastic Pressure
Pipes Using Flexible Elastomeric Seals
ASTM D3308
(2012) PTFE Resin Skived Tape
ASTM F477
(2014) Standard Specification for
Elastomeric Seals (Gaskets) for Joining
Plastic Pipe
MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS
INDUSTRY (MSS)
MSS SP-58
(1993; Reaffirmed 2010) Pipe Hangers and
Supports - Materials, Design and
Manufacture, Selection, Application, and
Installation
MSS SP-80
(2013) Bronze Gate, Globe, Angle and Check
Valves
NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)
NEMA ICS 1
(2000; R 2015) Standard for Industrial
Control and Systems: General Requirements
NEMA MG 1
(2014) Motors and Generators
SOCIETY FOR PROTECTIVE COATINGS (SSPC)
SSPC SP 6/NACE No.3
1.2
(2007) Commercial Blast Cleaning
SUBMITTALS
**************************************************************************
NOTE: Review submittal description (SD) definitions
in Section 01 33 00 SUBMITTAL PROCEDURES and edit
the following list to reflect only the submittals
required for the project.
The Guide Specification technical editors have
designated those items that require Government
approval, due to their complexity or criticality,
with a "G." Generally, other submittal items can be
reviewed by the Contractor's Quality Control
System. Only add a “G” to an item, if the submittal
is sufficiently important or complex in context of
the project.
For submittals requiring Government approval on Army
projects, a code of up to three characters within
the submittal tags may be used following the "G"
designation to indicate the approving authority.
Codes for Army projects using the Resident
Management System (RMS) are: "AE" for
Architect-Engineer; "DO" for District Office
(Engineering Division or other organization in the
SECTION 46 53 62
Page 7
Cements for Poly(Vinyl Chloride) (PVC)
Plastic Piping Systems
ASTM D3139
(1998; R 2011) Joints for Plastic Pressure
Pipes Using Flexible Elastomeric Seals
ASTM D3308
(2012) PTFE Resin Skived Tape
ASTM F477
(2014) Standard Specification for
Elastomeric Seals (Gaskets) for Joining
Plastic Pipe
MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS
INDUSTRY (MSS)
MSS SP-58
(1993; Reaffirmed 2010) Pipe Hangers and
Supports - Materials, Design and
Manufacture, Selection, Application, and
Installation
MSS SP-80
(2013) Bronze Gate, Globe, Angle and Check
Valves
NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)
NEMA ICS 1
(2000; R 2015) Standard for Industrial
Control and Systems: General Requirements
NEMA MG 1
(2014) Motors and Generators
SOCIETY FOR PROTECTIVE COATINGS (SSPC)
SSPC SP 6/NACE No.3
1.2
(2007) Commercial Blast Cleaning
SUBMITTALS
**************************************************************************
NOTE: Review submittal description (SD) definitions
in Section 01 33 00 SUBMITTAL PROCEDURES and edit
the following list to reflect only the submittals
required for the project.
The Guide Specification technical editors have
designated those items that require Government
approval, due to their complexity or criticality,
with a "G." Generally, other submittal items can be
reviewed by the Contractor's Quality Control
System. Only add a “G” to an item, if the submittal
is sufficiently important or complex in context of
the project.
For submittals requiring Government approval on Army
projects, a code of up to three characters within
the submittal tags may be used following the "G"
designation to indicate the approving authority.
Codes for Army projects using the Resident
Management System (RMS) are: "AE" for
Architect-Engineer; "DO" for District Office
(Engineering Division or other organization in the
SECTION 46 53 62
Page 7
District Office); "AO" for Area Office; "RO" for
Resident Office; and "PO" for Project Office. Codes
following the "G" typically are not used for Navy,
Air Force, and NASA projects.
An "S" following a submittal item indicates that the
submittal is required for the Sustainability
Notebook to fulfill federally mandated sustainable
requirements in accordance with Section 01 33 29
SUSTAINABILITY REPORTING.
Choose the first bracketed item for Navy, Air Force
and NASA projects, or choose the second bracketed
item for Army projects.
**************************************************************************
Government approval is required for submittals with a "G" designation;
submittals not having a "G" designation are for [Contractor Quality Control
approval.][information only. When used, a designation following the "G"
designation identifies the office that will review the submittal for the
Government.] Submittals with an "S" are for inclusion in the
Sustainability Notebook, in conformance to Section 01 33 29 SUSTAINABILITY
REPORTING. Submit the following in accordance with Section 01 33 00
SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Treatment System Installation; G[, [_____]]
SD-03 Product Data
Manufactured Units; G[, [_____]]
Spare Parts; G[, [_____]]
Framed Instructions; G[, [_____]]
Manufacturer's Written Instructions; G[, [_____]]
Welding
SD-06 Test Reports
Field Tests and Inspections; G[, [_____]]
Furnish test results in booklet form not less than 30 days prior
to the date of work completion.
SD-10 Operation and Maintenance Data
Operating and Maintenance Instructions; G[, [_____]]
[Six] [_____] [hard] [optical disk] copies.
1.3
DELIVERY, STORAGE, AND HANDLING
Protect from damage, deterioration, weather, humidity and temperature
variations, dirt and dust, or other contaminants, equipment in storage as
required by the manufacturer.
SECTION 46 53 62
Page 8
1.4
EXTRA MATERIALS
Submit spare parts data for all materials and for each different item of
equipment specified, after approval of the detail drawings, and not later
than [3] [_____] months prior to the date of work completion. Include in
the data a complete list of parts and supplies, with current unit prices
and source of supply.
PART 2
2.1
PRODUCTS
SYSTEM DESCRIPTION
**************************************************************************
NOTE: A continuous loop reactor or oxidation ditch
utilizes biological action to degrade organics in
the wastewater. Consideration should be given to
wastewaters from industrial facilities to ensure
there are no components detrimental to
microorganisms. In addition, Army facilities
utilizing continuous loop reactors should include
pretreatment equipment such as bar screens,
comminuters and a grit chamber as required by the
process conditions. Final clarification, sludge
handling and disinfection equipment is also
generally required. These and other possible
components of the complete treatment system guide
are not covered under this section.
As required for military construction, only sprayed
concrete (shotcrete) or placed reinforced concrete
will be acceptable for the basin construction. Clay
lined or synthetic membrane lined basins (even those
protected from erosion) are not acceptable.
**************************************************************************
The work required by this section consists of furnishing and installing a
continuous loop reactor (CLR). The system shall be a modified form of the
activated sludge process and classified as an extended aeration system.
The basin shall be an [earthen channel with an impervious sprayed concrete
surface] [reinforced concrete structure], constructed at the depth and
configuration indicated. The basin shall include all aeration/mixing
equipment, [piping,] [pumps,] [baffles,] [weirs] and [turning walls]
necessary for proper performance and operation.
2.1.1
Design Requirements
**************************************************************************
NOTE: Some states and regulatory agencies require a
minimum detention time of 24 hours. Check the
governing regulations for activated sludge/extended
aeration processes for the project location.
Insert average daily and peak daily flow rates and
the required BOD5 removal efficiency. Typically,
90-95 percent removal can be achieved in a
continuous loop reactor. Comply with UFC 3-240-02
to determine design criteria.
**************************************************************************
SECTION 46 53 62
Page 9
Treatment of the wastewater shall be accomplished by contact with the waste
activated sludge in the CLR for a minimum of [18] [_____] hours. The CLR
shall be sized for an average daily flow of [_____] L/second mgd and a peak
daily flow of [_____] L/second mgd. The CLR shall remove a minimum of
[_____] percent of the influent five day BOD at the average daily flow rate
and influent five day BOD.
2.1.2
Mixing Parameters
The aeration/mixing system selected shall provide the propelling force for
circulation and mixing of the basin contents. The aeration/mixing unit(s)
shall be sized to maintain an average horizontal velocity of not less than
[0.305] [_____] m/second [1.0] [_____] fps throughout the basin and
maintain a uniform mixed liquor suspended solids (MLSS) concentration
throughout the basin at MLSS concentrations up to [5000] [_____] mg/L, with
one aeration/mixing device not operating.
2.1.3
Aeration Parameters
**************************************************************************
NOTE: The Actual Oxygen Requirement (AOR) is
calculated by the designer. The oxygen required for
oxidation of BOD and the oxygen required for
nitrification must be included in the AOR. Typical
values are 0.82 kg 1.8 pounds of oxygen per 0.45 kg
1.0 pound of BOD applied and 2.1 kg 4.6 pounds of
oxygen per 0.45 kg 1.0 pound of TKN applied. The
alpha coefficient is defined as the ratio of the
oxygen transfer in the wastewater to the oxygen
transfer in clean water and may vary from 0.2 to
1.5. The alpha coefficient is a direct multiplier
in determining oxygen transfer capabilities and is
affected by mixed liquor temperature, liquid depth
and basin geometry, the level of turbulence, mixing
patterns and the nature of dissolved organics and
mineral constituents in the wastewater and even the
type of aeration equipment. Fine bubble aeration
systems typically have lower alpha values than
mechanical aeration systems. Because of this
variation in alpha value a default value is not
shown below. The Beta coefficient is defined as the
ratio of oxygen saturation level for the wastewater
(mixed liquor) to the oxygen saturation level for
tap water. Theta is a temperature correction
coefficient for oxygen transfer efficiency (OTE).
Values of 1.020 to 1.028 are normally used for
diffused air systems, while a value of 1.024 is
normally used for mechanical aeration systems.
An OTE of 0.507 mg oxygen per joule 3.0 lb.
oxygen/hp-hr under standard conditions is an average
value for aeration equipment commonly used in closed
loop reactor applications. Designer should contact
the aerator manufacturer for the OTE of a particular
aerator. An aeration system in this range will
provide oxygen transfer for an average power cost.
Insert the efficiency value desired for the
particular design.
SECTION 46 53 62
Page 10
The requirement to maintain a minimum dissolved
oxygen concentration of 0.5 mg/L should be omitted
if the designer has provided for an anoxic zone
within the reactor.
**************************************************************************
The aeration/mixing system selected shall be based upon the following
process requirements:
a.
Actual Oxygen Requirement (AOR) [_____] kg oxygen/day lbs. oxygen/day.
b.
Alpha Coefficient [_____].
c.
Beta Coefficient [0.95] [_____].
d.
Theta Coefficient [1.024] [_____].
e.
Wastewater temperature [20] [_____] degrees C [68] [_____] degrees F.
The aeration/mixing system selected shall provide no less than [_____] mg
oxygen/joule lb. oxygen/hp-hr under standard (clean water) conditions [and
be capable of maintaining a dissolved oxygen concentration of not less than
[0.5] [_____] mg/L anywhere in the CLR]. Provide factory test results for
a similar treatment application and configuration to substantiate the OTE.
2.2
MANUFACTURED UNITS
A complete list of equipment and materials, including manufacturer's
descriptive and technical literature; performance charts and curves;
catalog cuts; installation instructions; and a recommendation on quantities
of spare parts to have on hand at all times for each piece of equipment.
2.2.1
Standard Products
Provide materials and equipment which are the standard products of a
manufacturer regularly engaged in the manufacture of the products and which
essentially duplicate items that have been in satisfactory use in similar
facilities for at least 2 years prior to bid opening. All aeration/mixing
equipment, associated accessories, and appurtenances shall be supplied by
the same manufacturer. Equipment shall be supported by a service
organization that is, in the opinion of the Contracting Officer, reasonably
convenient to the site.
2.2.2
Nameplates
Provide pumps, blowers and motors with the manufacturer's name, address,
type or style, model or serial number, and catalog number on a stainless
steel plate permanently secured to the item of equipment.
2.2.3
Protection of Moving Parts
Belts, chains, couplings, and other moving parts shall be completely
enclosed by guards to prevent accidental personal injury. Guards shall be
removable or so arranged as to allow access to the equipment for
maintenance. If equipment is housed in a lockable housing, this shall be
sufficient protection and no additional guards are necessary.
SECTION 46 53 62
Page 11
To ensure the most efficient operation of the aeration system and to avoid
damage to the drive system the [discs shall be operated with a minimum
immersion of [300] [_____] mm [12] [_____] inch and a maximum immersion of
[535] [_____] mm [21] [_____] inch] [rotor blades shall be operated with a
minimum immersion of [100] [_____] mm [4] [_____] inch and a maximum
immersion of [355] [_____] mm [14] [_____] inch].
2.4.1.6
Shafts and Bearings
**************************************************************************
NOTE: There are no apparent mechanical or
operational advantages in stub shafts and continuous
through shafts. Different manufacturers market
different shafts. Check with potential
manufacturers before specifying shaft type.
Contractor should usually be allowed to use either
shaft.
**************************************************************************
The [disc] [or] [rotor] assembly shall be supported at both ends by a
shaft. The shaft shall be fabricated of steel conforming to ASTM A36/A36M.
The shaft shall be [solid steel] [a steel torque tube with a minimum 9.5 mm
0.375 inch wall thickness]. Each [disc] [or] [rotor] assembly shall be
furnished with support bearing assemblies. Bearings shall be waterproof,
self aligning and consist of a cast-iron pillow block set on adjustable
anchor plates. The bearings shall be grease lubricated and have a minimum
L-10 life of 100,000 hours in accordance with ABMA 9 or ABMA 11.
2.4.1.7
Protective Covering
Provide an [ultraviolet light protected fiberglass] [_____] cover,
extending over the length of each aeration unit. The cover shall be
designed to protect all adjacent structures from splashing caused by the
units. The cover shall be mounted independent of the aeration equipment
and be installed in accordance with the manufacturer's requirements.
2.4.2
2.4.2.1
Drive System
Reducer
The drive system reducer shall be constructed to maintain alignment of
bearings and gearing while absorbing the external loads of the [disc] [or]
[rotor] assembly. The unit shall be designed to continuously withstand all
internal loadings developed at the full load motor wattage horsepower,
including motor starting torques up to 250 percent of motor running
torques. The unit shall also be designed to withstand all external
loadings produced by torque, out-of-balance and vibration resulting from
operating conditions. The speed reducer shall be provided with lifting
lugs. The interior of the gear case shall be vented by an approved
breather, constructed to retard the entrance of water vapor.
2.4.2.2
Housing
Drive housing shall be weatherproof and constructed of steel in accordance
with ASTM A36/A36M or high grade cast-iron in accordance with ASTM A48/A48M.
A protective coating shall be applied that will not peel, crack or discolor
at continuous operating temperatures up to 121 degrees C 250 degrees F.
SECTION 46 53 62
Page 16
2.4.2.3
Rating
The drive gearing shall have a minimum service factor of at least [1.4]
[_____] times the rated brake horsepower of the drive motor. The gear
reduction system shall be suitable for continuous operation and moderate
shock loading in accordance with ANSI/AGMA 6113ANSI/AGMA 6013 for gear
motor reducers or gear motors using helical and spiral bevel gears.
2.4.2.4
Bearings
Power transmission bearings shall be antifriction type and shall have a
minimum L-10 life of 100,000 hours at maximum operating speed in accordance
with ABMA 9 or ABMA 11. Bearings shall be fully sealed and protected from
water spray.
2.4.2.5
Lubrication
**************************************************************************
NOTE: If lubricating pumps are not used delete
subparagraph b. and edit accordingly.
**************************************************************************
a.
Lubrication shall be provided by [gears running in an oil bath] [an oil
slinger] [pumps]. The drive shall be provided with an oil "dam",
spring loaded lip seals or other means of positive protection against
lubricant leakage around the output shaft. An oil level gauge or sight
glass and drain fittings shall also be provided. The thermal rating of
the gear reducer shall exceed the design load or proper cooling shall
be provided.
b.
Lubricating pumps shall be removable for maintenance without
disassembly of the drive and/or removal of the motor. Either a low
pressure or low oil level switch shall be provided to shut off the unit
in the event of insufficient lubrication.
2.4.2.6
Couplings
Power transmission from the motor to the gear reduction system shall be
supplied by [a flexible coupling, direct driven. The coupling shall be a
nonlubricant type, manufacturer's standard, and shall be selected to
provide a minimum service factor of 2.0] [sheaves and [V-belts] [chains].
To reduce the output speed, the sheaves shall be removable.] The assembly
shall be covered with a suitable guard and shall be protected from
splashing.
2.4.3
Mounting
The drive system shall be a base mounted type which is separately mounted
on a concrete pier or a shaft mounted type which is supported by the drive
side rotor bearing.
2.5
LOW SPEED SURFACE AERATORS
The low speed mechanical surface aerators shall be furnished and installed
as indicated. Each unit shall be complete and include an electric motor, a
gear reducer, shaft and impeller driven at a constant speed, and all
necessary fasteners, stabilizers, anchoring devices, and other mechanical
and structural appurtenances necessary for the mounting and operation of
the units. The aerators shall be designed for continuous operation.
SECTION 46 53 62
Page 17
[_____] cover for each aeration unit. The cover shall be designed to
protect all adjacent structures from splashing caused by the unit. The
cover shall be mounted independent of the aeration equipment and be
installed in accordance with the manufacturer's requirements.
2.6
SUBMERGED TURBINE DRAFT TUBE AERATORS
The submerged turbine draft tube aeration system shall be furnished and
installed as indicated. The unit shall be complete and include blowers,
drive unit, turbine aerator unit and supports, draft tube assembly, and all
appurtenances necessary for the proper operation of the equipment. The
aerators shall be designed for continuous operation.
2.6.1
Impeller Shaft
The shaft shall be constructed of [carbon steel] [_____] and shall be sized
to withstand all torque loads and bending moments produced by operation of
the system. The shaft and bearing assembly shall be designed to allow
operation below 80 percent of its natural frequency without the use of
stabilizing devices. The shaft shall be so constructed that its deflection
will not affect the alignment of the antifriction bearings or cause
misalignment of the gearing during the mixing/aeration operation. The
shaft supporting the impeller shall be removable from the drive assembly,
without disassembly of the gear box. Rolling, antifriction type bearings
on the impeller shaft shall have a minimum L-10 life of 100,000 hours in
accordance with ABMA 9 or ABMA 11. The entire weight of the shaft and
turbine will be supported by a thrust bearing integral with the gear
reducer. A rigid coupling shall be used to connect the shaft and turbine
assembly to the output shaft of the reducer. Bearings on the shaft shall
be either grease or oil lubricated and shall be positively sealed against
penetration of moisture or leakage of lubricant down the shaft. Provisions
shall be included for checking the adequacy of lubrication.
2.6.2
Impeller
The impeller shall be constructed of [carbon steel] [_____] and shall be
positively fastened to the shaft with all [carbon steel] [_____] hardware.
The impeller shall be removable from the shaft. Means shall be provided
for adjustment of the impeller. If the adjustment is on the shaft, a means
shall be provided to prevent the impeller from dropping off the shaft
during adjustment.
2.6.3
2.6.3.1
Drive System
Reducer
The drive system reducer shall be constructed to maintain alignment of
bearings and gearing while absorbing the external loads of the impeller.
The unit shall be designed to withstand continuously all internal loadings
developed at the full load motor wattage horsepower, including motor
starting torques up to 250 percent of motor running torques. The unit
shall also be designed to withstand all external loadings produced by
torque, thrust, out-of-balance and vibration resulting from operating
conditions. The speed reducer shall be provided with lifting lugs. The
interior of the gear case shall be vented by an approved breather,
constructed to retard the entrance of water vapor.
SECTION 46 53 62
Page 20
2.6.3.2
Housing
Drive housing shall be weatherproof and shall be constructed of steel in
accordance with ASTM A36/A36M or high grade cast-iron conforming to
ASTM A48/A48M. A protective coating shall be applied that will not peel,
crack or discolor at continuous operating temperatures up to 121 degrees C
250 degrees F.
2.6.3.3
Rating
The gearing shall have a minimum service factor of at least [2.0] [_____]
times the rated brake horsepower of the drive motor. The gear reduction
system shall be suitable for continuous operation and moderate shock
loading in accordance with ANSI/AGMA 6113ANSI/AGMA 6013 for motor reducers
or gear motors using helical and spiral bevel gears.
2.6.3.4
Bearings
Power transmission bearings shall be antifriction type and shall have a
minimum L-10 life of 100,000 hours at maximum operating speed in accordance
with ABMA 9 or ABMA 11. Bearings shall be fully sealed and protected from
water spray.
2.6.3.5
Lubrication
**************************************************************************
NOTE: If lubricating pumps are not used delete
subparagraph b. and edit accordingly.
**************************************************************************
a.
Lubrication shall be provided by [gears running in an oil bath] [an oil
slinger] [pumps]. Drive shall be provided with an oil "dam" or other
means of positive protection against lubricant leakage around the
output shaft. An oil level gauge or sight glass and drain fittings
shall also be provided. The thermal rating of the gear reducer shall
exceed the design load or proper cooling shall be provided.
b.
Lubricating pumps shall be removable for maintenance without
disassembly of the drive and/or removal of the motor. Either a low
pressure or low oil level switch shall be provided to shut off the unit
in the event of insufficient lubrication.
2.6.3.6
Couplings
Power transmission from the motor to the gear reduction system shall be
supplied by a nonlubricated coupling, direct driven. Couplings shall be
the manufacturer's standard and shall be selected to provide a minimum
service factor of 2.0.
2.6.4
Draft Tube
Each draft tube shall consist of upper and lower sections of epoxy coated
steel. The upper section shall consist of the suction cone, supports for
connection to the turbine support assembly, air distribution assembly,
deflection limiting system, flow direction baffles, and supports for
connection to the bottom section. The bottom section shall be [_____] mm
feet long, sufficient to carry the design flow with minimal pressure drop.
Bottom section shall be shaped to carry the wastewater to a sufficient
depth to dissolve the required oxygen and direct the flow forward in the
SECTION 46 53 62
Page 21
To ensure the most efficient operation of the aeration system and to avoid
damage to the drive system the [discs shall be operated with a minimum
immersion of [300] [_____] mm [12] [_____] inch and a maximum immersion of
[535] [_____] mm [21] [_____] inch] [rotor blades shall be operated with a
minimum immersion of [100] [_____] mm [4] [_____] inch and a maximum
immersion of [355] [_____] mm [14] [_____] inch].
2.4.1.6
Shafts and Bearings
**************************************************************************
NOTE: There are no apparent mechanical or
operational advantages in stub shafts and continuous
through shafts. Different manufacturers market
different shafts. Check with potential
manufacturers before specifying shaft type.
Contractor should usually be allowed to use either
shaft.
**************************************************************************
The [disc] [or] [rotor] assembly shall be supported at both ends by a
shaft. The shaft shall be fabricated of steel conforming to ASTM A36/A36M.
The shaft shall be [solid steel] [a steel torque tube with a minimum 9.5 mm
0.375 inch wall thickness]. Each [disc] [or] [rotor] assembly shall be
furnished with support bearing assemblies. Bearings shall be waterproof,
self aligning and consist of a cast-iron pillow block set on adjustable
anchor plates. The bearings shall be grease lubricated and have a minimum
L-10 life of 100,000 hours in accordance with ABMA 9 or ABMA 11.
2.4.1.7
Protective Covering
Provide an [ultraviolet light protected fiberglass] [_____] cover,
extending over the length of each aeration unit. The cover shall be
designed to protect all adjacent structures from splashing caused by the
units. The cover shall be mounted independent of the aeration equipment
and be installed in accordance with the manufacturer's requirements.
2.4.2
2.4.2.1
Drive System
Reducer
The drive system reducer shall be constructed to maintain alignment of
bearings and gearing while absorbing the external loads of the [disc] [or]
[rotor] assembly. The unit shall be designed to continuously withstand all
internal loadings developed at the full load motor wattage horsepower,
including motor starting torques up to 250 percent of motor running
torques. The unit shall also be designed to withstand all external
loadings produced by torque, out-of-balance and vibration resulting from
operating conditions. The speed reducer shall be provided with lifting
lugs. The interior of the gear case shall be vented by an approved
breather, constructed to retard the entrance of water vapor.
2.4.2.2
Housing
Drive housing shall be weatherproof and constructed of steel in accordance
with ASTM A36/A36M or high grade cast-iron in accordance with ASTM A48/A48M.
A protective coating shall be applied that will not peel, crack or discolor
at continuous operating temperatures up to 121 degrees C 250 degrees F.
SECTION 46 53 62
Page 16
2.4.2.3
Rating
The drive gearing shall have a minimum service factor of at least [1.4]
[_____] times the rated brake horsepower of the drive motor. The gear
reduction system shall be suitable for continuous operation and moderate
shock loading in accordance with ANSI/AGMA 6113ANSI/AGMA 6013 for gear
motor reducers or gear motors using helical and spiral bevel gears.
2.4.2.4
Bearings
Power transmission bearings shall be antifriction type and shall have a
minimum L-10 life of 100,000 hours at maximum operating speed in accordance
with ABMA 9 or ABMA 11. Bearings shall be fully sealed and protected from
water spray.
2.4.2.5
Lubrication
**************************************************************************
NOTE: If lubricating pumps are not used delete
subparagraph b. and edit accordingly.
**************************************************************************
a.
Lubrication shall be provided by [gears running in an oil bath] [an oil
slinger] [pumps]. The drive shall be provided with an oil "dam",
spring loaded lip seals or other means of positive protection against
lubricant leakage around the output shaft. An oil level gauge or sight
glass and drain fittings shall also be provided. The thermal rating of
the gear reducer shall exceed the design load or proper cooling shall
be provided.
b.
Lubricating pumps shall be removable for maintenance without
disassembly of the drive and/or removal of the motor. Either a low
pressure or low oil level switch shall be provided to shut off the unit
in the event of insufficient lubrication.
2.4.2.6
Couplings
Power transmission from the motor to the gear reduction system shall be
supplied by [a flexible coupling, direct driven. The coupling shall be a
nonlubricant type, manufacturer's standard, and shall be selected to
provide a minimum service factor of 2.0] [sheaves and [V-belts] [chains].
To reduce the output speed, the sheaves shall be removable.] The assembly
shall be covered with a suitable guard and shall be protected from
splashing.
2.4.3
Mounting
The drive system shall be a base mounted type which is separately mounted
on a concrete pier or a shaft mounted type which is supported by the drive
side rotor bearing.
2.5
LOW SPEED SURFACE AERATORS
The low speed mechanical surface aerators shall be furnished and installed
as indicated. Each unit shall be complete and include an electric motor, a
gear reducer, shaft and impeller driven at a constant speed, and all
necessary fasteners, stabilizers, anchoring devices, and other mechanical
and structural appurtenances necessary for the mounting and operation of
the units. The aerators shall be designed for continuous operation.
SECTION 46 53 62
Page 17
2.5.1
Impeller Shaft
The shaft shall be constructed of [carbon steel] [_____] and shall be sized
to withstand all torque loads and bending moments produced by operation of
the system. The shaft and bearing assembly shall be designed to allow
operation below 80 percent of its natural frequency without the use of
stabilizing devices. The shaft shall be so constructed that its deflection
will not affect the alignment of the antifriction bearings or cause
misalignment of the gearing during the mixing/aeration operation. The
shaft supporting the impeller shall be removable from the drive assembly,
without disassembly of the gear box. Rolling, antifriction type bearings
on the impeller shaft shall have a minimum L-10 life of 100,000 hours in
accordance with ABMA 9 or ABMA 11. The entire weight of the shaft and
impeller shall be supported by a thrust bearing integral with the gear
reducer. A rigid coupling shall be used to connect the shaft and turbine
assembly to the output shaft of the reducer. Bearings on the shaft shall
be either grease or oil lubricated, and shall be positively sealed against
penetration of moisture, or leakage of lubricant down the shaft. Provisions
shall be included for checking the adequacy of lubrication.
2.5.2
Impeller
The impeller shall be constructed of [carbon steel] [_____] and shall be
positively fastened to the shaft with all [carbon steel] [_____] hardware.
Means shall be provided for adjustment of the impeller. If the adjustment
is on the shaft, a means shall be provided to prevent the impeller from
dropping off the shaft during adjustment. Impeller submergence shall be
determined by the equipment supplier to ensure the most efficient operation
of the aeration system.
2.5.3
2.5.3.1
Drive System
Reducer
The drive system reducer shall be constructed to maintain alignment of
bearings and gearing while absorbing the external loads of the impeller.
The unit shall be designed to withstand continuously all internal loadings
developed at the full load motor wattage horsepower, including motor
starting torques up to 250 percent of motor running torques. The unit
shall also be designed to withstand all external loadings produced by
torque, thrust, out-of-balance and vibration resulting from operating
conditions. The speed reducer shall be provided with lifting lugs. The
interior of the gear case shall be vented by an approved breather,
constructed to retard the entrance of water vapor.
2.5.3.2
Housing
Drive housing shall be weatherproof and shall be constructed of steel in
accordance with ASTM A36/A36M or high grade cast-iron conforming to
ASTM A48/A48M. A protective coating shall be applied that will not peel,
crack or discolor at continuous operating temperatures up to 121 degrees C
250 degrees F.
2.5.3.3
Rating
The gearing shall have a minimum service factor of at least [2.5] [_____]
times the rated brake horsepower of the drive motor. The gear reduction
system shall be suitable for continuous operation and moderate shock
SECTION 46 53 62
Page 18
c.
Pump Column and Discharge Elbow: The pump supporting column shall be
made of steel pipe with a minimum [6] [_____] mm [1/4] [_____] inch
thickness. The discharge opening shall be flanged for connection to
the discharge pipe. The discharge elbow shall be the long radius type,
and shall be of [welded steel] [cast-iron].
d.
Base Plate: The pumping unit shall be suspended from a base plate of
adequate structural design to support the weight of the complete unit
filled with water. The base plate shall be cast iron or steel and
shall be sized to allow the entire pump to be removed, with the
discharge flange attached; base plate mounting hardware shall be
stainless steel. The packing box shall be located on or above the base
plate to provide for easy maintenance. The motor shall be mounted
above the pump.
e.
Suction Bell and Impeller Housing: The suction bell and impeller
housing shall be made of [ductile] [cast] iron [_____] and shall be
designed for easy removal of the propeller and lower bearing. The
suction bell shall have a flared inlet designed to reduce entrance loss
and be provided with flanges to adequately support the lower bearing
and support the weight of the propeller and propeller shaft.
f.
Propeller: The pump propeller shall be constructed of [bronze] [_____]
and shall be balanced statically and dynamically to reduce vibration
and wear.
g.
Propeller Shaft: The propeller shaft shall be sized to operate without
objectionable distortion or vibration in both forward and reverse
rotation. The propeller shaft shall be made of [stainless steel]
[_____] and be direct coupled to the line shaft. The propeller shaft
shall be adjustable with reference to the bowl. The line shaft shall
be constructed of [carbon steel] [_____] and extend as one unit to the
motor shaft. The line shaft shall be enclosed in a water-tight steel
column.
h.
Bearings: The pump shall have a [bronze] [_____] sleeve bearing
immediately above the propeller, and a [bronze] [_____] lower support
bearing below the propeller. For line shafts greater than 3 m 10 feet
in length, [bronze] [_____] intermediate shaft bearings shall also be
provided. The intermediate shaft bearings shall be inside the
water-tight steel column. At the top of the line shaft, a [bronze]
[_____] tension bearing with a tension nut and tension ring shall be
included. All bearings shall be easily replaceable and shall be spaced
to provide adequate support for the shaft and to prevent vibration.
All bearings shall have an L-10 life of 100,000 hours in accordance
with ABMA 9 or ABMA 11.
i.
Lubrication: The pump shall be equipped with an automatic lubricating
system which shall supply grease lubricant to all but the lower support
bearings. The lower support bearings shall be grease packed.
2.7.2.2
Submersible Centrifugal Pumps
The submersible centrifugal pumps used for the jet aeration system shall be
in accordance with Section 22 13 29 SANITARY SEWERAGE PUMPS.
2.7.2.3
Self-Priming Centrifugal Pumps
The self-priming centrifugal pumps used for the jet aeration system shall
SECTION 46 53 62
Page 26
be in accordance with Section 22 13 29 SANITARY SEWERAGE PUMPS.
2.7.2.4
Vertical Turbine Pumps
**************************************************************************
NOTE: Vertical turbine pump manufacturer design
manuals should be consulted to determine spacing of
pumps to avoid influence of the pump suctions.
**************************************************************************
The vertical turbine pumps used for the jet aeration system shall be in
accordance with Section 43 21 39 PUMPS: WATER, VERTICAL TURBINE.
2.7.2.5
Pump Suction Screens
A [stainless steel] [_____] screen shall be mounted to the suction of the
pump. The screen shall allow nothing larger than 25 mm 1 inch in diameter
to pass.
2.7.3
Blowers
The blowers shall be in accordance with Section 46 51 00.00 10 AIR AND GAS
DIFFUSION EQUIPMENT.
2.8
DIFFUSED AERATION/SLOW SPEED MIXER SYSTEM
The diffused aeration/slow speed mixer system shall be furnished and
installed as indicated. The system shall be complete and shall include air
supply, distribution and diffuser equipment designed to satisfy the oxygen
requirement, and the adequate number of submersible mixing units to create
and maintain a horizontal velocity in the basin and maintain solids
suspension. The air supply and distribution system shall include blowers,
piping, valves, diffusers, supports and all necessary appurtenances to
ensure proper operation of the equipment. The mixing units shall consist
of a propeller driven by a [submersible electric motor] [hydraulic system],
a support structure that allows the unit to be easily removed from the
basin, and all cables and appurtenances necessary to ensure proper
operation of the equipment. The combined system shall be designed for
continuous operation.
2.8.1
Diffused Aeration System
The diffused aeration and blower system shall be as specified in Section
46 51 00.00 10 AIR AND GAS DIFFUSION EQUIPMENT.
2.8.2
Slow Speed Mixer (With Submersible Electric Motor)
**************************************************************************
NOTE: Designer will allow bids on either hydraulic
motors or electric motors unless job requirements
warrant eliminating one of the options.
**************************************************************************
All components of the mixer, including the motor, shall be capable of
continuous underwater operation while the mixer blade is both completely
submerged or partly submerged. In addition, all components of the mixer,
including motor, shall be capable of continuous operation in air,
completely unsubmerged, for a minimum of [2] [_____] hours.
SECTION 46 53 62
Page 27
2.6.3.2
Housing
Drive housing shall be weatherproof and shall be constructed of steel in
accordance with ASTM A36/A36M or high grade cast-iron conforming to
ASTM A48/A48M. A protective coating shall be applied that will not peel,
crack or discolor at continuous operating temperatures up to 121 degrees C
250 degrees F.
2.6.3.3
Rating
The gearing shall have a minimum service factor of at least [2.0] [_____]
times the rated brake horsepower of the drive motor. The gear reduction
system shall be suitable for continuous operation and moderate shock
loading in accordance with ANSI/AGMA 6113ANSI/AGMA 6013 for motor reducers
or gear motors using helical and spiral bevel gears.
2.6.3.4
Bearings
Power transmission bearings shall be antifriction type and shall have a
minimum L-10 life of 100,000 hours at maximum operating speed in accordance
with ABMA 9 or ABMA 11. Bearings shall be fully sealed and protected from
water spray.
2.6.3.5
Lubrication
**************************************************************************
NOTE: If lubricating pumps are not used delete
subparagraph b. and edit accordingly.
**************************************************************************
a.
Lubrication shall be provided by [gears running in an oil bath] [an oil
slinger] [pumps]. Drive shall be provided with an oil "dam" or other
means of positive protection against lubricant leakage around the
output shaft. An oil level gauge or sight glass and drain fittings
shall also be provided. The thermal rating of the gear reducer shall
exceed the design load or proper cooling shall be provided.
b.
Lubricating pumps shall be removable for maintenance without
disassembly of the drive and/or removal of the motor. Either a low
pressure or low oil level switch shall be provided to shut off the unit
in the event of insufficient lubrication.
2.6.3.6
Couplings
Power transmission from the motor to the gear reduction system shall be
supplied by a nonlubricated coupling, direct driven. Couplings shall be
the manufacturer's standard and shall be selected to provide a minimum
service factor of 2.0.
2.6.4
Draft Tube
Each draft tube shall consist of upper and lower sections of epoxy coated
steel. The upper section shall consist of the suction cone, supports for
connection to the turbine support assembly, air distribution assembly,
deflection limiting system, flow direction baffles, and supports for
connection to the bottom section. The bottom section shall be [_____] mm
feet long, sufficient to carry the design flow with minimal pressure drop.
Bottom section shall be shaped to carry the wastewater to a sufficient
depth to dissolve the required oxygen and direct the flow forward in the
SECTION 46 53 62
Page 21
channel. The draft tube shall be [_____] mm inch in diameter with a 6 mm
1/4 inch minimum wall thickness, and shall be equipped with grout rings as
shown.
2.6.5
Mounting
A [structural bridge of steel conforming to ASTM A36/A36M] [concrete
bridge] and support assembly designed to mount each aerator shall be
constructed as indicated. The bridge assembly shall be sufficient to
support the turbine aerator, suction cone, air sparge assembly and the flow
directional baffle assembly.
2.6.6
Air Supply Equipment
The blower shall conform to Section 46 51 00.00 10 AIR AND GAS DIFFUSION
EQUIPMENT.
2.7
JET AERATION
**************************************************************************
NOTE: Jet aeration systems require that preliminary
treatment system be included upstream of the CLR to
remove grit and other larger particles to reduce the
likelihood of plugging the nozzles.
The aeration equipment covered in this specification
is listed below along with some general requirements
for their use. For further assistance in
determining the applicability of the CLR, refer to
UFC 3-230-14A and for design criteria refer to UFC
3-240-02.
a. Disc or Rotor (Brush) Aerators: This type of
aeration system creates surface agitation to provide
oxygen transfer and imparts a horizontal velocity by
the rotation of the unit. The channel may be
constructed with either sloped or vertical side
walls. Typically the channels are constructed 2.4 m
8 feet to 3.7 m 12 feet deep. Channels greater than
2 m 7 feet deep may require a velocity baffle
downstream of the aeration unit to help impart a
downward velocity to the wastewater and improve
mixing along the channel bottom. The CLR should not
be constructed with a sidewater depth greater than
4.3 m 14 feet if disc or brush aerators are
specified. In addition, turning walls are
recommended at each bend to maintain channel
velocities around the corners.
b. Low Speed Surface Aerators: This type of
aeration system creates surface agitation to provide
oxygen transfer and imparts a velocity to the
wastewater by the swirling action created by the
impeller. The aerators must be placed at the turns
in the channel to achieve effective horizontal
velocity. At bends where aerators are not located,
turning walls are recommended to maintain channel
velocities around the corners. Floating aerators
should not be considered for use in a CLR
SECTION 46 53 62
Page 22
application due to the area required for the
pontoons. The channel may be constructed with
either sloped or vertical side walls. With this
equipment, vertical side walls are recommended at
the turns. Channel depths will vary from 2 to 5 m 6
to 16 feet). Draft tubes should be provided when
recommended by the manufacturer.
c. Submerged Turbine Aerators: Submerged turbine
aerators used in CLR's utilize a downward pumping
impeller to force an air and water mixture through a
draft tube that extends below the bottom of the
basin and through a barrier wall extending across
the basin. The barrier wall may be constructed of
concrete, compacted clay or reinforced earth. The
turbine's impeller should be located at a depth of
approximately 20 percent of the basin sidewater
depth. The air is discharged through a sparge ring
below the impeller and becomes entrained in the
downward flow of water through the draft tube. The
system requires an air blower, as well as the
turbine unit. However, the system offers turn down
flexibility because the turbine and blower are
operated independent of each other. Sloped or
vertical walls are acceptable with this system and
the basin should have a single side water depth
within the range of 2.4 to 5 m 8 to 16 foot
sidewater depth. In addition, turning walls are
recommended at each bend to maintain channel
velocities around the corners.
d. Jet Aeration: Jet aeration combines air flow
and pumped liquid in a vortex jet nozzle which is
discharged just above the channel floor. The jet
system consists of a recirculation pumping system
and an air blower, each feeding headers that
discharge through the jet nozzles. The typical
configuration utilizes a concrete basin with a 3.7
to 6 m 12 to 20 foot sidewater depth, preferably
with vertical side walls. In addition, turning
walls are recommended at each bend to maintain
channel velocities around the corners. The jet
nozzles can be fixed or they can be mounted on
removable or swing headers to facilitate
maintenance. Removable and swing header systems
will require the construction of thrust blocks
located behind the nozzles to prevent any deflection
caused by the jet action.
e. Diffused Aeration/Low Speed Mixer System: In
this system, a coarse, medium or fine bubble
diffused aeration system is used in conjunction with
a submerged low speed mixing unit that supplies the
horizontal velocity. The propeller type mixer,
mounted on guide rails, is positioned immediately
upstream of the diffusers. Vertical or sloping side
walls are acceptable with basin sidewater depth
ranging between 3.7 to 6 m 12 to 20 foot. In
addition, turning walls are recommended at each bend
SECTION 46 53 62
Page 23
to maintain channel velocities around the corners.
Vertical side walls are recommended in the area of
the diffusers to maximize oxygen transfer.
Consideration should also be given to providing a
removable or swing header system to facilitate
maintenance of the diffusers.
f. System Choice: Since the configuration of the
channel will vary with the type of equipment
selected, the choice of aeration system must be
decided upon first. Each aeration system listed
above is specified herein. Only the paragraphs
applying to the aeration system selected should be
included in the specification. All paragraphs and
subparagraphs for the other aeration systems should
be deleted.
**************************************************************************
The jet aeration system shall be provided as indicated. The system shall
include air-liquid jet manifolds, [vertical propeller] [submerged
centrifugal] pumps, pneumatic backflush system, air blowers, and all
in-basin air and liquid piping and supports. The jet aeration system shall
be designed for continuous operation.
2.7.1
Submerged Jets
**************************************************************************
NOTE: The nozzle size will affect the performance
of the system by changing the water and air mixture.
The standard nozzle size is 40 mm 1-1/2 inches,
however, the process requirements should be checked
to determine proper nozzle size. The number and
size of nozzles is site specific and is effected by
the tank size, solids concentration, oxygen demand
requirements and other factors. Designer should
contact the equipment manufacturer for information
on nozzle sizing.
**************************************************************************
The jet aeration system shall consist of [fiberglass reinforced plastic]
[_____] jet nozzles, oriented in a common direction and attached to a
common manifold. The manifold shall consist of separate liquid and air
piping so that the air and liquid do not mix prior to reaching the mixing
chamber of the jet. The liquid portion of the manifold shall provide
uniform distribution of mixed liquor from the inlet of the manifold to each
of the jets. The jets shall consist of 2 nozzles and a mixing chamber
constructed integrally with the manifold. The primary jet shall direct the
mixed liquor into the mixing chamber where air will be introduced and
combined with the liquid. The air-liquid mixture shall then be discharged
into the secondary nozzle and, hence horizontally into the basin. The two
nozzles shall be carefully molded to maintain proper alignment and
tolerances. To reduce the likelihood of plugging, each jet nozzle shall
have a minimum intake and discharge diameter of 40 mm 1-1/2 inches. The
manifold assembly shall be constructed of [fiberglass reinforced plastic]
[epoxy coated carbon steel] [_____]. The manifold shall be designed to
withstand all normal stresses encountered in shipping, handling and
operation.
SECTION 46 53 62
Page 24
2.7.2
Recirculation Pumps
**************************************************************************
NOTE: Select the applicable pump from the following
paragraphs:
**************************************************************************
2.7.2.1
Vertical Propeller Pump
**************************************************************************
NOTE: Vertical propeller pump manufacturer design
manuals should be consulted to determine spacing of
pumps to avoid influence of the pump suctions.
Pumps should be identified on the drawings by a
number. Insert the identification number in part b.
of this paragraph; part b. should be repeated as
necessary for pumps of the same type with different
operating characteristics.
**************************************************************************
a.
General: The pumping system shall be installed as indicated and be
suitable for outdoor installation. The unit, consisting of vertical
shaft, [single] [multistage] propeller type pump and motor shall be
designed to operate safely in the reverse direction of rotation, due to
water returning through the pump. The weight of the revolving parts of
the pump, including the unbalanced hydraulic thrust of the propeller,
shall be carried by a thrust bearing in the motor. The pump shall be
supported from a base plate by means of a vertical column having
horizontal discharge located below the base plate.
b.
Pump Characteristics: Pump number(s) [_____] shall have the following
operating characteristics:
(1)
Pump Service.
(2)
Design Operating Point: [_____] L/second gpm flow, [_____] mm
feet head, [_____] percent efficiency.
(3)
Maximum Operating Point: [_____] L/second gpm flow, [_____] mm
feet head, [_____] percent efficiency.
(4)
Minimum Operating Point: [_____] L/second gpm flow, [_____] mm
feet head, [_____] percent efficiency.
(5)
Propeller Type:
[_____].
(6)
Discharge Diameter:
(7)
Bell Diameter:
[_____] mm inch.
(8)
Column Length:
[_____] mm feet.
(9)
Operating Speed:
[_____] mm inch.
[_____] rpm.
(10)
Minimum Bell Submergence:
(11)
Pump Control:
[_____] mm inch.
[_____].
SECTION 46 53 62
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c.
Pump Column and Discharge Elbow: The pump supporting column shall be
made of steel pipe with a minimum [6] [_____] mm [1/4] [_____] inch
thickness. The discharge opening shall be flanged for connection to
the discharge pipe. The discharge elbow shall be the long radius type,
and shall be of [welded steel] [cast-iron].
d.
Base Plate: The pumping unit shall be suspended from a base plate of
adequate structural design to support the weight of the complete unit
filled with water. The base plate shall be cast iron or steel and
shall be sized to allow the entire pump to be removed, with the
discharge flange attached; base plate mounting hardware shall be
stainless steel. The packing box shall be located on or above the base
plate to provide for easy maintenance. The motor shall be mounted
above the pump.
e.
Suction Bell and Impeller Housing: The suction bell and impeller
housing shall be made of [ductile] [cast] iron [_____] and shall be
designed for easy removal of the propeller and lower bearing. The
suction bell shall have a flared inlet designed to reduce entrance loss
and be provided with flanges to adequately support the lower bearing
and support the weight of the propeller and propeller shaft.
f.
Propeller: The pump propeller shall be constructed of [bronze] [_____]
and shall be balanced statically and dynamically to reduce vibration
and wear.
g.
Propeller Shaft: The propeller shaft shall be sized to operate without
objectionable distortion or vibration in both forward and reverse
rotation. The propeller shaft shall be made of [stainless steel]
[_____] and be direct coupled to the line shaft. The propeller shaft
shall be adjustable with reference to the bowl. The line shaft shall
be constructed of [carbon steel] [_____] and extend as one unit to the
motor shaft. The line shaft shall be enclosed in a water-tight steel
column.
h.
Bearings: The pump shall have a [bronze] [_____] sleeve bearing
immediately above the propeller, and a [bronze] [_____] lower support
bearing below the propeller. For line shafts greater than 3 m 10 feet
in length, [bronze] [_____] intermediate shaft bearings shall also be
provided. The intermediate shaft bearings shall be inside the
water-tight steel column. At the top of the line shaft, a [bronze]
[_____] tension bearing with a tension nut and tension ring shall be
included. All bearings shall be easily replaceable and shall be spaced
to provide adequate support for the shaft and to prevent vibration.
All bearings shall have an L-10 life of 100,000 hours in accordance
with ABMA 9 or ABMA 11.
i.
Lubrication: The pump shall be equipped with an automatic lubricating
system which shall supply grease lubricant to all but the lower support
bearings. The lower support bearings shall be grease packed.
2.7.2.2
Submersible Centrifugal Pumps
The submersible centrifugal pumps used for the jet aeration system shall be
in accordance with Section 22 13 29 SANITARY SEWERAGE PUMPS.
2.7.2.3
Self-Priming Centrifugal Pumps
The self-priming centrifugal pumps used for the jet aeration system shall
SECTION 46 53 62
Page 26
be in accordance with Section 22 13 29 SANITARY SEWERAGE PUMPS.
2.7.2.4
Vertical Turbine Pumps
**************************************************************************
NOTE: Vertical turbine pump manufacturer design
manuals should be consulted to determine spacing of
pumps to avoid influence of the pump suctions.
**************************************************************************
The vertical turbine pumps used for the jet aeration system shall be in
accordance with Section 43 21 39 PUMPS: WATER, VERTICAL TURBINE.
2.7.2.5
Pump Suction Screens
A [stainless steel] [_____] screen shall be mounted to the suction of the
pump. The screen shall allow nothing larger than 25 mm 1 inch in diameter
to pass.
2.7.3
Blowers
The blowers shall be in accordance with Section 46 51 00.00 10 AIR AND GAS
DIFFUSION EQUIPMENT.
2.8
DIFFUSED AERATION/SLOW SPEED MIXER SYSTEM
The diffused aeration/slow speed mixer system shall be furnished and
installed as indicated. The system shall be complete and shall include air
supply, distribution and diffuser equipment designed to satisfy the oxygen
requirement, and the adequate number of submersible mixing units to create
and maintain a horizontal velocity in the basin and maintain solids
suspension. The air supply and distribution system shall include blowers,
piping, valves, diffusers, supports and all necessary appurtenances to
ensure proper operation of the equipment. The mixing units shall consist
of a propeller driven by a [submersible electric motor] [hydraulic system],
a support structure that allows the unit to be easily removed from the
basin, and all cables and appurtenances necessary to ensure proper
operation of the equipment. The combined system shall be designed for
continuous operation.
2.8.1
Diffused Aeration System
The diffused aeration and blower system shall be as specified in Section
46 51 00.00 10 AIR AND GAS DIFFUSION EQUIPMENT.
2.8.2
Slow Speed Mixer (With Submersible Electric Motor)
**************************************************************************
NOTE: Designer will allow bids on either hydraulic
motors or electric motors unless job requirements
warrant eliminating one of the options.
**************************************************************************
All components of the mixer, including the motor, shall be capable of
continuous underwater operation while the mixer blade is both completely
submerged or partly submerged. In addition, all components of the mixer,
including motor, shall be capable of continuous operation in air,
completely unsubmerged, for a minimum of [2] [_____] hours.
SECTION 46 53 62
Page 27
2.8.2.1
Mixer Propeller
The propeller shall be constructed of [ASTM A167, Type 304 stainless steel]
[cast-iron] [molded fiberglass] [_____] and shaped so that no solids,
fibrous material and other material found in normal wastewater applications
will collect on the blades. The propeller shall be dynamically balanced to
[5.3] [_____] N/meter [0.03] [_____] pounds/inch and shall [be internally
keyed for engagement with the shaft] [slide onto the shaft and be securely
fastened with a screw washer and sleeve] [_____].
2.8.2.2
Drive System
Each mixer shall be a direct-driven, close-coupled, completely submersible
unit. The mixer motor shall be a squirrel-cage induction, shell type
design, housed in an air-filled, watertight chamber. The stator winding
shall be insulated with moisture-resistant Class F insulation in accordance
with NEMA MG 1 and shall be designed for continuous duty. The cable entry
shall be an integral part of the stator casing and shall be leakproof. In
addition, all mating surfaces where water tight sealing is required shall
be machined and fitted with [nitrile] [_____] rubber O-rings.
2.8.2.3
Shafts and Seals
The mixer motor shaft shall be integral with the propeller shaft and shall
rotate on two permanently lubricated bearings. The ball bearings shall
have a minimum L-10 life of 100,000 hours as defined by ABMA 9 or ABMA 11.
Each mixer shall be provided with a tandem mechanical rotating shaft seal
system on the propeller shaft. Seals shall be of the lapped end face type
and shall run in an oil reservoir. The inner seal shall contain one
stationary and one positively driven rotating ceramic ring. The outer seal
shall contain one stationary and one positively driven rotating tungsten
carbide ring.
2.8.2.4
Mounting
The mixer shall be capable of being raised and lowered from the basin for
ease of repair and maintenance. The mixer shall be mounted on and guided
by a sliding bracket which shall be constructed to withstand all thrust
created by the mixer. A lifting cable and winch mechanism shall be
provided to permit raising and lowering of the mixer on the sliding bracket.
2.8.3
Slow Speed Mixer (With Hydraulic Motors)
Each hydraulic horizontal mixer shall consist of a hydraulic power unit and
motor, a direct drive shaft and propeller, hydraulic lines, and all
mounting and support brackets to provide for proper operation. In
addition, all components of the mixer shall be capable of continuous
operation in air, completely unsubmerged, for a minimum of [2] [_____]
hours.
2.8.3.1
Mixer Propeller
The propeller shall be constructed of [cast-iron] [molded fiberglass]
[_____] and shaped so that no solids, fibrous material and other material
found in normal wastewater applications will collect on the blades. The
propeller shall be dynamically balanced to [5.3] [_____] N/meter [0.03]
[_____] pounds/inch and shall [be internally keyed for engagement with the
shaft] [slide onto the shaft and be securely fastened with a screw washer
and sleeve] [_____].
SECTION 46 53 62
Page 28
2.8.3.2
Drive System
a.
Hydraulic Motor: The hydraulic motor shall be of the low speed, high
torque, fixed displacement type to drive the propeller. The hydraulic
motor shall be capable of withstanding end thrust loads of not less than
4.45 kN 1000 pounds either into or out from the motor. The hydraulic
motor shall be rated for a B-10 life of not less than 100,000 hours in
accordance with ABMA 9 or ABMA 11. The hydraulic motor shall be
connected to the hydraulic pump with a hose having a continuous
pressure rating of not less than 20.7 MPa 3000 psi.
b.
Hydraulic Pump: The hydraulic pump shall be enclosed in the hydraulic
reservoir which shall be mounted directly to the electric motor
adapter. The hydraulic pump shall have a continuous pressure rating of
not less than 13.8 MPa 2000 psi. The hydraulic fluid flow control
mechanism shall be locking and fully adjustable to allow for infinitely
variable speed control.
c.
Reservoir and Accessories: The hydraulic reservoir shall be
constructed of steel. The unit shall include a filler/breather
assembly, and a fluid level/temperature gauge and clean-out cover. The
hydraulic reservoir shall be connected to the hydraulic motor with a
hose having a continuous pressure rating greater than the rating of the
hydraulic pump but not less than 20.7 MPa 3000 psi.
2.8.3.3
Mounting
The mixer shall be capable of being raised and lowered from the basin for
ease of repair and maintenance. The mixer shall be mounted on and guided
by a sliding bracket which shall be constructed to withstand all thrust
created by the mixer. A lifting cable and winch mechanism shall be
provided to permit raising and lowering of the mixer on the sliding bracket.
2.9
LUBRICATION REQUIREMENTS
An adequate means of lubrication shall be provided for all moving parts
subject to wear. Except as otherwise specified, lubrication shall be by
grease or oil. Grease fittings shall be provided for all grease-type
bearings. If bearings are not easily accessible, grease tubing shall be
provided in a convenient location. Bearings shall be provided with relief
ports to prevent build-up of pressures which might damage the bearings or
seals. Oil reservoirs shall be liberal in size and shall be provided with
an opening for filling, an overflow opening at the proper location to
prevent overfilling, and a drain opening at the lowest point. Reservoirs
shall be properly vented to prevent pressure build-up.
2.10
ELECTRIC MOTORS
A squirrel-cage induction motor suitable for continuous duty shall be used.
The motor shall have a power rating which will be nonoverloading for any
conditions under which the driven equipment must function.
2.10.1
Frame
The motor frame size shall be selected in accordance with NEMA MG 1.
Motors of the same rating, mounting, and characteristics shall be
interchangeable.
SECTION 46 53 62
Page 29
2.10.2
Design
Induction motors shall be Design B as defined in NEMA MG 1, with normal
torque and low starting current.
2.10.3
Enclosure
A totally enclosed fan cooled enclosure shall be provided.
2.10.4
Terminal Boxes
Cast-iron terminal boxes shall be sized for the space required, for the
allowable bending radius and stiffness of the motor supply cables, and for
terminating a grounding conductor. The terminal boxes shall be gasketed
and have threaded conduit entrances or hubs. Terminal boxes shall be
rotatable for connection from any one of four directions at 90 degree
intervals with a motor lead seal and separator gasket provided between the
motor frame and terminal box.
2.10.5
Bearings
Grease lubricated, shielded, antifriction steel ball bearings shall be
provided and greased with a moisture resistant grease. Grease fittings and
excess grease purge plugs shall be readily accessible and shall be located
externally so that bearing lubricant can be changed without removing fan
housing or dismantling the motor.
2.10.6
Windings
Motor windings shall be nonhygroscopic, epoxy coated.
2.10.7
Motor Characteristics
Motor rotors shall receive a standard dynamic balance. The maximum
amplitude (peak to peak) of motor vibration, as measured at the bearing
housing, and the method of measurement shall be in accordance with NEMA MG 1.
The motor characteristics such as wattage horsepower, speed, rpm, voltage
and phase requirements and insulation class shall be as indicated.
2.10.8
Motor Controls
NEMA ICS 1.
2.11
SPECIAL TOOLS
One set of special tools, calibration devices, and instruments required for
operation, calibration and maintenance of the equipment shall be provided.
PART 3
3.1
EXECUTION
EXAMINATION
Verify all dimensions in the field, and advise the Contracting Officer of
any discrepancy in the contract documents before performing the work.
3.2
TREATMENT SYSTEM INSTALLATION
Submit drawings containing complete wiring and schematic diagrams;
equipment layout and anchorage; and any other details required to
SECTION 46 53 62
Page 30
demonstrate that the system has been coordinated and will properly function
as a unit. Drawings showing proposed layout and anchorage of equipment and
appurtenances and equipment relationship to other parts of the work
including clearances required for maintenance and operation. Piecemeal
submittals will not be accepted.
Excavation, filling, and backfilling shall be in accordance with Section
31 00 00 EARTHWORK. Reinforced concrete, of the size and design indicated,
shall be installed in accordance with Section [03 30 00.00 10 CAST-IN-PLACE
CONCRETE][03 30 00 CAST-IN-PLACE CONCRETE].
3.2.1
Welding
Piping shall be welded in accordance with AWS D1.1/D1.1M by welders
certified to have passed tests using procedures in accordance with
AWS B2.1/B2.1M or ASME BPVC SEC IX. The welder or welding operator shall
apply the assigned personal symbol near each weld made, as a permanent
record. Structural members shall be welded in accordance with Section
05 05 23.16 STRUCTURAL WELDING. Welding and nondestructive testing
procedures are specified in Section 40 05 13.96 WELDING PROCESS PIPING.
Submit a copy of qualified procedures and a list of names and
identification symbols of qualified welders and welding operators. Welding
procedures qualified by others, and welders and welding operators qualified
by another employer may be accepted as permitted by ASME B31.1. Notify the
Contracting Officer 24 hours in advance of tests and the tests shall be
performed at the work site if practicable.
3.2.2
Pipe and Valve Installation
Piping shall be installed with all joints tight and with no undue marring
of finishes. Installed piping, valves, and fittings shall be free from
strain and excessive stresses caused by weight or misalignment.
3.2.2.1
Flanged Joints
Bolts shall be tightened uniformly to prevent overstressing flanges and
misalignment.
3.2.2.2
Screwed Joints
Screwed joints shall be made tight with joint compound, applied to the male
threads only, or with joint tape.
3.2.2.3
Push-On Joints for PVC Pipe
Pipe ends shall be beveled to facilitate assembly. Pipe shall be marked to
indicate when the pipe is fully seated. Gaskets shall be lubricated to
prevent displacement. Care shall be exercised to ensure that the gasket
remains in proper position in the bell or coupling while joints are made.
3.2.2.4
Solvent-Weld Joints for PVC Pipe
Joints shall be made in accordance with the manufacturer's written
instructions.
3.2.2.5
Valves
Valves shall be installed and located for easy access for operation.
SECTION 46 53 62
Page 31
3.2.3
Equipment Installation
Equipment installation shall be in accordance with the manufacturer's
written instructions.
3.2.4
Electrical Work
Electrical work shall be in accordance with the applicable requirements of
Section [_____].
3.3
PAINTING
All metal surfaces, except aluminum, bronze, brass, galvanized steel, and
stainless steel shall be painted. Surface preparation and painting shall
be performed in the field. Manufactured items, such as motors and
switchboards, shall be finished with the manufacturer's standard finish.
3.3.1
Preparation and Application
Ferrous metal surfaces shall be prepared in accordance with
SSPC SP 6/NACE No.3 and painted with a three coat MIL-DTL-24441 epoxy paint
to achieve a total dry film thickness of 150 microns (6 mils). Master
Painter's Institute (MPI) #120 Epoxy, High build, Self Priming, Low Gloss,
may be substituted for MIL-DTL-24441.
3.3.2
Coating Examination
Coatings shall be examined for flaws and tested for thickness and holidays.
Thickness of coatings shall be measured wet and dry using a commercial film
thickness gauge. Notify the Contracting Officer in advance of any
painting. Additional coats shall not be applied until the previous coat
has been approved. Repair or additional coatings shall be accomplished at
no additional cost to the government.
3.3.3
Coating Repair
If welding is required after application of the coating or if the coating
is damaged in any way, repair shall consist of preparing the affected area
in compliance with SSPC SP 6/NACE No.3 and reapplying the coating to that
area. If holidays are detected or film thickness is insufficient, the
surface shall be prepared and additional coats applied in the affected area
in compliance with the manufacturer's instructions.
3.4
FRAMED INSTRUCTIONS
Submit approved wiring and control diagrams showing the complete layout of
the entire system, including equipment, piping valves, and control
sequence, framed under glass or in approved laminated plastic, for posting
where directed. In addition, condensed operating instructions explaining
preventive maintenance procedures, methods of checking the system for
normal safe operation, and procedures for safely starting and stopping the
system shall be prepared in typed form, framed as specified above for the
wiring and control diagrams, and posted beside the diagrams. The framed
instructions shall be posted before acceptance testing of the systems
3.5
FIELD TESTS AND INSPECTIONS
Water required for the field tests will be supplied.
SECTION 46 53 62
Page 32
The Contracting
Officer will witness all field tests and conduct field inspections. Give
the Contracting Officer [14] [_____] days prior notice of the dates and
times for acceptance tests. Any deficiencies found shall be rectified and
work affected by such deficiencies shall be completely retested at the
Contractor's expense.
3.5.1
Basin Leakage Test
After completion of the installation and as soon as practical, a leakage
test shall be conducted on the CLR basin. The basin shall be filled with
clean water and left standing for 24 hours. Basin leakage shall not exceed
25 mm 1 inch drop in water surface elevation in 24 hours. Any leaks
encountered shall be repaired and the basin shall be retested. The basin
shall be watertight prior to proceeding with the tests specified below.
3.5.2
Operating Tests
After completion of the installation and as soon as practical, an operating
test of the CLR and all equipment shall be performed to demonstrate that
the system functions properly. The tests shall include all manufacturer's
recommended tests for equipment vibration, horizontal and vertical
alignment and structural integrity. Wattage Horsepower [and air flow
rates] shall be checked and verified with the manufacturer's design data
for the specified equipment. Aerator wattage horsepower shall be nameplate
plus or minus five percent. After completion of all tests, the system
shall be adjusted for proper operation in accordance with the
manufacturer's written instructions and the operating and maintenance
instructions.
3.5.3
Velocity Test
After completion of the basin leakage and operating tests, a velocity test
shall be conducted on the basin. Velocity cross-sections shall be taken at
a distance of 3 m 10 feet upstream of the shaft centerline of each
aerator. Each cross-section shall consist of a minimum of 16 velocity
measurements equidistantly spaced so that the distance between measurement
points does not exceed 1.2 m 4 feet vertically or horizontally.
Measurement points shall begin at approximately 0.6 m 2 feet from walls.
The average velocity at each cross-section shall not be less than 0.3 m/s
1.0 fps. Where average velocities are found to be less than that
specified, make modifications to the system as needed to produce the
required velocities at no extra cost to the Government.
3.5.4
Standard Oxygen Transfer Efficiency Test (S.O.T.E.)
After completion of the velocity test an S.O.T.E. test shall be performed.
This test shall be in accordance with ASCE 2-06. The aeration system
oxygenation capacity shall not be less than [1.4] [_____] kg [3] [_____]
pounds of oxygen per watt horsepower per hour with [_____] aeration units
operating at a combined power draw of [_____] watts horsepower. The test
shall be repeated in the same water until ten tests have been run or until
the total dissolved solids (TDS) exceed 2000 mg/L. A minimum to maximum
power curve shall be plotted from the results. Power input shall be based
on wire power. Test shall be performed by a nationally recognized
independent testing laboratory.
3.5.5
Reporting Test Results
Upon completion and testing of the installed system,
SECTION 46 53 62
Page 33
submit test reports
showing all field tests performed to adjust each component and all field
tests performed to prove compliance with the specified performance
criteria. Each test report shall indicate the final position of controls.
Reporting of results shall be in accordance with paragraph 9.0 "REPORTING"
of ASCE 2-06.
3.6
3.6.1
MANUFACTURER'S SERVICES
Supervise Installation, Adjustment, and Testing
Obtain the services of the manufacturer's representative experienced in the
installation, adjustment, and operation of the equipment specified to
supervise the installation, adjustment and testing of the equipment in
accordance with manufacturer's written instructions.
3.6.2
Field Training
Conduct a training course for the operating staff as designated by the
Contracting Officer. The training period shall consist of a total [_____]
hours of normal working time and shall start after the system is
functionally completed but prior to final acceptance tests. The field
instructions shall cover all of the items contained in the Operating and
Maintenance Instructions, as well as demonstrations of routine maintenance
operations. Contracting Officer shall be notified at least 14 days prior
to date of proposed conduction of the training course.
3.7
OPERATING AND MAINTENANCE INSTRUCTIONS
Furnish instructions including the manufacturer's name, model number,
service manual, parts list, and brief description of all equipment and
their basic operating features. Each set shall be permanently bound and
shall have a hard cover. The following identification shall be inscribed
on the covers: the words "OPERATING AND MAINTENANCE INSTRUCTIONS," name and
location of the facility, name of the Contractor, and contract number.
Instructions shall include, but not be limited to, the following:
a.
System layout showing piping, valves, and controls.
b.
Approved wiring and control diagrams.
c.
A control sequence describing startup, operation, and shutdown.
d.
Operating and maintenance instructions for each piece of equipment,
including lubrication instructions and troubleshooting guide.
e.
Manufacturer's bulletins, cut sheets and descriptive data, parts lists,
and recommended spare parts.
f.
Simplified diagrams for the system as installed.
-- End of Section --
SECTION 46 53 62
Page 34
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