2903 Wavin Hep2O IG:Installer Guide

2903 Wavin Hep2O IG:Installer Guide
Push-fit Plumbing System
Installer Guide
BS 7291
D
VE T
A P P RODUC
P RO
July 2009
Contents
Page
Introduction
Basics
3
4
5
6-7
8-9
10
Standard
Applications
11-12
Sitework
13-15
16-18
18
18
19
19
19
19
20
21
22
23
24-27
28-29
30
30-32
Introduction, Approvals
Features & Benefits, Installation
Performance, System Assembly
Pipe Selection, Standard Pipe, Barrier Pipe,
Pipe Specification, Straight Lengths, Coils
Pipe Cutting
Jointing
Cabling through Joists
Pipe Support
Pipe Installation in Exposed Locations
Pipe Installation in Concealed Locations
Pipes through Walls and Floors
Laying of Pipe in Floor Screeds
Pipes Adjacent to Metalwork
Piping Noise Reduction
Manifolds/Microbore Plumbing
Underfloor Heating Pipe
Routabout
Conduit Systems
Installation Recommendations
Hep2O ® Within Dry Lined Walls
Hep2O ® Within Internal Drywall Systems
Hep2O ® Within Timber Framed and Steel Framed
Buildings
Compatability 33-41
& Connections
Metric Copper Pipe, Using Compression, Fittings, Adjacent
to Capillary Joints, Imperial Copper, Chrome Plated Copper
or Stainless Steel Pipe, Incoming Service Pipe, Brass Spigots,
Acorn System, Plastic Pipes, Steel pipes and Threaded
Bosses, Connection to Appliances, Draw-off Taps, Ancillaries
(Pumps, Valves, etc.), Storage Vessels and Radiators, Boilers
and Heaters
System
42-43
Modifications
44
Fitting Detachment, Lubrication
Alterations
General
Information
45
45
45
45
45
46
46
Thermal Insulation
Freezing for Maintenance/System Modification
Painting Hep2O ®
Use of Corrrosion Inhibitors
Antifreeze
Electrical Safety
Woodworm/Timber Treatment
Special
Precautions
47
47
47
External Installations
Vermin
Chlorine
Testing
48
Pressure Testing
Special
Applications
49
49
49
49
50
50
50
Boats
Caravans
Exhibitions
Portable Buildings (site cabins, toilets etc.)
Agricultural and Horticultural Use
Air Conditioning Systems
Where not to use Hep2O ®
Handling &
Storage
51
Handling and Storage
Hints & Tips
52
Fault Finding 53-54
Hints and Tips
Fault Finding
Information
Advisory Service
Literature Service
Other Sources of Information Literature
2
55
55
55
The Hep2O® Installer Guide for Flexible Push-Fit Plumbing
Introduction
The mark of a professional tradesman is
that he understands and employs a wide
range of materials and systems to achieve
the best possible solution to individual
installation situations.
The notes in this Installer Guide are
intended to assist professional plumbers to
obtain the best results from using flexible push-fit
plumbing, enhancing good plumbing practice.
It is not sufficient to simply replace item for item, pipe length for pipe
length, as this approach will not derive the maximum benefit from the
system. It is necessary to design the system from the outset, embracing the
benefits the system offers to achieve maximum benefits.
Enhanced Hep2O ® flexibility means an opportunity to develop further
skills when planning and installing plumbing, offering a comprehensive range
of pipes and fittings to meet plumbing requirements.
Greater pipe flexibility, long coil lengths and guaranteed joint performance,
enables installations to be completed with fewer joints minimising system
costs. Pipes can be cabled into position avoiding the awkward manoeuvring
associated with rigid straight lengths. Hep2O ® fittings are designed to
accept copper as well as Hep2O ® pipe, enabling systems to be mixed if
required.
Hep2O ® is a tried and tested system, which has been in use in the UK for
over 25 years.
Approvals
Hep2O ® is manufactured and kitemarked to Class S of
BS 7291, Parts 1 and 2 and is manufactured within a
Quality Management System which satisfies
BSEN ISO9002 requirements.
BS 7291
Hep2O ® Barrier Pipe is covered by Agrément
Certificate 92/2823 to Class ‘S’ of BS 7291.
Hep2O ® Is listed in the Water Fittings and Materials
Directory - Listing Number 0112066.
D
VE T
A P P RODUC
P RO
Hep2O ® is suitable for use in domestic water distribution and central
heating systems including pressurised systems and combination boilers in
accordance with Table No. 1. It may also be used in buildings other than
dwellings providing the service conditions are not exceeded.
Table No. 1 Peak Life Cycle Operating Temperatures/Pressures
20°C
30°C
40°C
50°C
60°C
70°C
80°C
95°C
Short
Malfunction
at 114°C
Safe pressures:
Bar
12
9
8
7
6
3
psi
174
167
11.5
160
11
152
10.5
131
116
102
87
43.5
Head of water (m)
120
115
110
105
90
80
70
60
29
3
1
The Hep2O® Installer Guide for Flexible Push-Fit Plumbing
Hep2O ® has a minimum design life expectancy of 50
years provided the system is installed in accordance
with the manufacturer’s recommendations. These
recommendations include service temperatures and
pressures. Peak life cycle operating temperatures /
pressures are given in Table No. 1. As a result of its
rigorous Quality Management Programme Wavin offer a 50 year guarantee
against defects in materials or manufacturing of all Hep2O ® pipe and
fittings.
Features and Benefits
Hep2O ® has evolved over 25 years to offer improved installation
advantages, whilst maintaining proven long term performance benefits.
Flexible pipe work and joint security are the key features of Hep2O ®.
Pipe flexibility in conjunction with straight coils in SmartPackTM
dispensers enables pipe to be cabled into position, with fewer joints,
minimising system costs. The Hep2O ® fitting incorporates a high integrity
grab wedge and robust pre-lubricated ‘O’ ring, offering the installer
smoother pipe insertion and lower jointing forces.
The re-usable grab wedge gives reliable jointing even when the fitting has
been dismantled and reassembled.
Installation
Hep2O ® introduces a new flexibility for the professional to exploit during
installation.
Cabling Ability
Less Jointing
Low Wastage
Measure and Cut
In-situ
High Resistance to
Impact
Rotatable Fittings
Easier Handling
Less Risk Jointing, No
Naked Flame
4
The Hep2O® Installer Guide for Flexible Push-Fit Plumbing
Performance
Once installed Hep2O ® offers considerable benefits over traditional
rigid systems.
No Scale Build-up
No Burst Pipes
Quieter
Cool to the Touch
Solder Free
Corrosion Free
1
System Assembly
In skilled hands the flexible Hep2O ® plumbing system guarantees
professional sitework.
5
Basics
Pipe Selection
Hep2O ® pipe is manufactured as two types, Standard and Barrier.
Their correct applications are as follows:-
Standard Pipe
Standard pipe is suitable for domestic hot and cold water services and
heating applications. As standard pipe may allow the ingress of minute
amounts of oxygen molecules through the pipe wall when used for heating a
suitable inhibitor (Sentinel or Fernox MB1) should be used.
Barrier Pipe
Barrier pipe is designed for central heating systems and incorporates an
oxygen barrier to inhibit oxygen permeation. The use of inhibitors with
barrier pipe is still recommended as corrosion can occur in all types of
system regardless of pipe material.
Barrier pipe may be used for domestic hot and cold water services.
Both Hep2O ® Standard and Barrier Pipe is accepted by British
Gas/ Scottish Gas Central Heating Care Contracts.
Note:
Hep2O ® pipe is not suitable for the conveyance of gas.
Pipe Specification
The 15mm, 22mm and 28mm pipe is available in straight lengths and coils.
The 10mm pipe is only supplied in coils. Availability is clearly shown in
Table 2 (see page 7).
Straight Lengths
Straight lengths of Hep2O ® are not rigid, and are as flexible as coiled pipe.
Straight lengths are primarily for exposed pipework where neatness is
important or for use where only short lengths are required.
Coils
Coiled Hep2O ® is primarily suited to ‘first fix’
work on site, where minimal pipe jointing is
desirable.
Hep2O ® is available in straight coils, in
SmartPackTM dispensers.
Unlike other forms of coiled plastic pipe,
Hep2O ® does not tend to return to its
coiled state when uncoiled for installation.
Hep2O ® straight coiled pipe has a tendency to
remain straight when uncoiled with no loss of flexibility.
Hep2O ® Pipe in Pipe System incorporates Hep2O ® Barrier Pipe in a
pre-sheathed conduit ready for underscreed installation, saving time, effort
and complies with current regulations.
6
Basics
Table No. 2 Standard and Barrier Pipe Lengths
10mm
15mm
22mm
28mm
3m
6m
Straight Lengths
2
Coils
25m
50m
100m
Pipe in Pipe
25m
50m
G
Cut Length
Standard and Barrier
Straight Cut Lengths.
G
Standard Straight Coiled
Pipe
Straight Coiled Lengths in
SmartPackTM Dispenser.
G
Barrier Straight Coiled
Pipe
Straight Coiled Lengths in
SmartPackTM Dispenser.
G
Pipe in Pipe System
Hep2O ® Barrier Pipe in
Blue or Red Conduit.
7
Basics
Pipe Cutting
Basic Jointing/Pipe Cutting
When cutting Hep2O ® pipe it is essential to use the correct tools.
Only the recommended cutters as shown in the current trade price list
(HD74, HD75, HD77 or HD78) should be used.
Do not use a hacksaw. (Figure No. 1)
Before making a joint ensure the pipe end is clean, cut square and free
from burrs and surface damage. (Figure No. 2). Place the pipe in the jaws of
the cutter and apply pressure, the pipe should be rotated whilst
maintaining the pressure until the pipe is severed. (Figure No. 3)
DON’T
DON’T
Figure No. 1
Do not use a hacksaw to cut
Hep2O ® pipe.
Figure No. 2
Do not use damaged pipe.
Ensure pipe is free from burrs
and surface damage.
To ensure adequate insertion, essential for a secure
joint, cut the pipe
V
square at one of the cutting/insertion marks ‘ ’. The distance between
these marks indicates full socket depth (Figure No. 3).
Figure No. 3
V
When it may not be possible to use the ‘ ’ marks eg. badly lit areas,
jointing copper pipe or where an exact length is required, mark the
insertion depth on the pipe using a pencil or suitable marker pen. The
correct insertion depth can be obtained by holding the pipe against the
fitting or by measuring with a rule, as shown (Figure No. 4). The depth
of insertion is shown in Table 3 at the end of this section.
8
Basics
Pipe Cutting cont.
Figure No. 4
Hep2O ®
SlimLine Fitting
Hep2O ®
Demountable Fitting
2
Pipe depth
insertion marks
Insertion
depth
Insertion
depth
Pipe depth
insertion marks
Support Sleeve
ALWAYS insert a Hep2O ® support sleeve into the Hep2O ® pipe end.
(Figure No. 5).
It is essential to use a support sleeve in order to make a good joint.
The support sleeve ensures that the pipe retains a circular section and
provides a leading edge to the pipe for easier insertion (the only
exceptions to this rule are when using copper pipe, or the open spigot
end of a Hep2O ® fitting).
Figure No. 5
Table No. 3
Demountable and SlimLine
Correct insertion depths for
Hep2O ® fittings
Pipe size
Nominal insertion Depth inc. sleeve
10mm
23mm
15mm
28mm
22mm
31mm
28mm
40mm
Note:
Support sleeve is an integral part of the system and
should NEVER be omitted when using Hep2O ® pipe.
9
Basics
Jointing
Procedure - whichever type of fitting is used, the same jointing
procedure should be used. All fittings are pre-lubricated.
Figure No. 6
Use only purpose designed pipe
cutters. (HD74, HD75, HD77 or
HD78)
Cut the pipe at one of the
V
‘ ’ marks. Ensure the pipe end is
free from burrs.
Figure No. 7
Insert a Hep2O ® support sleeve
(HX60) into the pipe end.
Figure No. 8
Push the pipe firmly into the fitting.
A secure joint has been made when
the endVof the cap has reached the
next ‘ ’ mark on the pipe.
Figure No. 9
Tug back on the pipe to ensure the
grab wedge engages correctly.
DO
G
G
G
G
G
G
G
G
Use only Hep2O ® cutters when cutting the pipe.
V
Cut the pipe at the ‘ ’ marks wherever possible.
V
Mark the pipe if not possible to cut to a ‘ ’.
When cutting rotate pipe whilst maintaining the pressure until the pipe
is severed.
Cut the pipe squarely.
Ensure pipe end is clean, free from burrs & surface damage.
Always use a support sleeve into a Hep2O ®‚ pipe end.
Push the pipe and fitting together firmly.
DON’T
G Use a hacksaw to cut the pipe.
G Slacken the retaining cap prior to pipe insertion, this will not ease
jointing.
G Knock fittings onto pipe.
G Undo retaining cap after pipe insertion.
10
Standard Applications
Hep2O ® is suitable for most domestic and commercial plumbing
applications.
With it’s extensive range of fittings, Hep2O ® meets the requirements of
modern systems ensuring secure connection.
Figure No. 10
Wash Hand Basin 15mm
3
Figure No. 11
Wash Hand Basin 10mm
Figure No. 12
Bath
Figure No. 13
W.C.
11
Standard Applications
Figure No. 14
Sink
Figure No. 15
Boiler Connections
Figure No. 16
Figure No. 17
Cylinder Cupboard
Cylinder Cupboard
Figure No. 18
Washing Machine/Dishwasher
12
Sitework
Cabling through Joists
The 1992 Building Regulations Approved Document
A allows for pipework to be installed in joists by
one of two methods, notching or drilling.
Traditionally joists have been notched and the
pipework laid in as the rigidity of the pipe
does not easily allow for any other method of
installation. This means that the pipework must
be installed prior to the floorboards being laid.
This has a number of disadvantages:
G Plumber has to work on open joists increasing
risk of accident or injury.
G
Plumber will have to return after floors are laid to connect
radiators, etc.
G
Plumber often finds that on his return, tails he left have been moved
by other tradesmen thereby causing extra work to reposition
pipework correctly for radiators.
4
Cabling through joists means pipework can be installed by working from
below allowing exact positioning of ‘tails’ through floor.
Site safety is therefore enhanced and the plumber is not exposed to the
danger of falling or the discomfort of kneeling on open joists. Other trades
working below are protected from the dangers of falling tools, molten solder,
gas bottles etc.
As flooring can be laid prior to the plumber carcassing from below this will
progress the building schedule as other trades can work on the floor above
e.g. to form studwork etc.
Carcassing at a later stage in the construction programme is also more
pleasant as the building is likely to be weatherproof.
Less Risk to Health and Site Safety
The unique Hep2O ® fitting ensure effective, leak-free pipe jointing without
the use of a naked flame.
Safety from fire, especially in restricted spaces, is greatly increased and the
working environment is improved.
There is no need for flux and solder, thus eliminating any potential
contamination of water supplies.
Push-fit jointing also has the following advantages for the installer:
G No naked flame means that precautions such as obtaining a ‘hot work’
permit, having a fire extinguisher readily available, and remaining on site
for a while after jointing are not necessary.
G
No risk of infringement of Health and Safety recommendations
applicable to some brands of flux. eg. means to control exposure to
noxious fumes when working in a confined space, and use of eye
protection (where appropriate).
G
After jointing the fitting is clean and safe to touch
eg. after soldering joint, is hot and flux traces should be removed.
G
Joint is rotatable after installation.
13
Sitework
Cabling through Joists cont.
Summary
Flexible plumbing means that the installer can cable pipework more easily
utilising continuous runs of pipework. The flexibility does away with dry
runs as the pipe can be cut and joints made in situ. As no solvents are used
in jointing, the system can be tested as soon as the installation is finished.
Exposed pipework should use the recommended clipping distances as
shown in Table 4 (see page 17).
Tails fitted through the floor for connections to sanitary ware can be left
long enough for final connections. Straight connections and offset
connections normally required for rigid connections are then unnecessary.
Hep2O ® can be trimmed to length and the natural flexibility used to
overcome any mis-alignment.
The Hep2O ® system incorporates a comprehensive range of spigot tees.
These can be used individually or in groups to give manifold arrangements
with the benefit of 360 degree rotation.
This facility means that systems based on conventional UK design can be
enhanced by the addition of manifolds where beneficial.
Joists can be drilled and pipework cabled through, rather than notched
which is the normal practice with rigid pipework systems. (This is
permitted by Building Regulations, NHBC Standards and several British
Standards). This means that pipework no longer needs to be installed prior
to floorboards being laid.
The ability to install pipe through joists has specific advantages:
Often eliminating the need for separate carcassing and second fix
operations.
When Hep2O ® is cabled through joists it can be easily positioned to allow
for the installation of thermal insulation if required. Pipework can be
exactly positioned for the radiators etc. avoiding the risk of being moved or
damaged by other trades. Safer working environment for all trades as
upstairs floors are already in place. It is safer for the plumbing installer as
the drilling can be carried out from the floor below. There is less danger of
puncturing the pipe with nails used for fixing the floorboards and there is
no need to use protective devices such as ‘joist clips’.
Note:
The Building Regulations 1992 Approved Document A
gives exact instructions on the drilling of floor joists.
Those regulations are detailed below:
Hole diameters should be no greater than 0.25 of the depth of the
joist and should be drilled at the neutral axis.
They should be not less than 3 diameters (centre to centre) apart and
should be located between 0.25 and 0.4 times the span from the
support.
These points are illustrated in Figure No. 19 (see page 15).
The value 0.25 is obviously one quarter and can easily be calculated on
site. The value 0.4 is less obvious and can be obtained from Figure No. 20
(see page 15).
14
Sitework
Cabling through Joists cont.
Engineered Joists
Hep2O ® is ideal in buildings incorporating timber ‘I’ joists. Piping can be
properly installed through holes in the web section
without damaging flange members
(eg. TJI Joist system, Trus Joist MacMillan Ltd.)
even where the pre-formed holes do not align
on the plan. Pumps, Valves etc:
Where Hep2O ® is connected to pumps,
valves and similar devices consideration
should be given to adequately supporting the
item in question (bearing in mind the rotatability
of the Hep2O ® joint). Equipment should not be
suspended from the pipe without adequate support.
4
Figure No. 19 Explanation of Drilling Joists in Accordance with
Building Regulations 1992 - Approved Document A
SPAN S
HOLES SHOULD BE
LOCATED IN THIS
ZONE & DRILLED AT
THE NEUTRAL AXIS.
0.4 x ‘S’
0.25 x ‘S’
CENTRAL AXIS
OF JOIST
DEPTH.
NOT LESS THAN 3 DIAMETERS
APART CENTRE TO CENTRE.
MAX. DIAMETERS OF HOLES =
0.25 X DEPTH OF JOIST.
NB: The minimum distance between a hole and a notch in the same joist
should not be less than 100mm.
Figure No. 20 Graph Showing Dimension of Joist Drilling Zone
from Support
2.0
Distance from Support (m)
om
fr
ance
1.0
um
Minim
2.0
Sup
Dist
um
im
Max
0.5
1.5
t
por
1.5
2.5
nce
Dista
from
ort
Supp
4.0
3.0
3.5
Span of Joist (m)
4.5
5.0
Notes: This graph should be used in conjunction with Figure No. 19.
Example of use: Joist span is 4.5m.
Find value on horizontal scale and read-up to sloping line.
Transfer point of intersection to the vertical scale and read 1.8m.
15
Sitework
Pipe Support
The Hep2O ® system includes two types of pipe clip, the screw fix type
(HX85) and the nail type (HX65). The nail type is primarily designed for use
on concealed pipework, and allows for rapid fixing to timber. The screw type
may be used together with a spacer (HX86) which allows a greater spacing
between the pipe and the fixing background. The spacer therefore allows
different pipe fixing centres which can be used to facilitate pipe cross-overs
or the installation of thermal insulation to the pipe (see Figure No. 22). A
cold forming bend fixture (HX75) is available to allow the formation of a
bend on 15mm and 22mm pipes for situations where secure fixing and
neatness are important. (See Figure No. 23).
Figure No. 21 Pipe Clips
Pipe Clip - Nail
Pipe Clip - Screw
Code
Nominal Diameter
HX65/10
10
HX65/15
15
HX65/22
22
HX65/28
28
Code
Nominal Diameter
HX85/15
15
HX85/22
22
HX85/28
28
Code
Nominal Diameter
HX86/15
15
HX86/22
22
NB: The HX86/22 spacer can be used with
both the HX85/22 and HX85/28 clip.
Pipe Clip - Spacer
Figure No. 22 Pipe Fixing Centres
CL
CL
B
A
Pipe Clip
Pipe Clip and Spacer
Note: Fixing hole size is 5mm diameter.
Nominal Diameter
mm
Dimension A
mm
Dimension B
mm
15
17
40
22
21
43
28
24
46
16
Sitework
Pipe Support cont.
Figure No. 23 Cold Forming Bend Fixture Radii
Fixing hole size is 5mm.
Suitable for a No. 10
woodscrew
A
Nominal Diameter mm
Radius A mm
15
120
22
176
4
The recommended support distances for general purpose use are
shown in Table No. 4.
Where piping is adequately supported or is run within concealed
spaces (eg. through suspended timber floors) clips can be reduced or
omitted provided that:
G Pipe does not form part of an open vent provided for safe operation of
heat source.
G
Pipe does not form a distribution pipe or circuit where effective air
venting might be impaired by poor pipe alignment.
G
Hot pipe will not touch cold pipe or vice versa.
G
There is no risk that pipes or fittings will come in contact with sharp,
abrasive or other potentially damaging surfaces.
G
There is no risk pipe will come in contact with materials which may
suffer damage or discoloration from transmitted heat.
Table No. 4 Recommended Clipping Distances
Nominal Diameter
mm
Horizontal Runs
m
Vertical Runs
10
0.3
0.5
15
0.3
0.5
22
0.5
0.8
28
0.8
1.0
For improved visual appearance support distances of 300mm are
suggested for Hep2O ® in exposed locations.
NB: Where the pipe is concealed clipping may not be considered
necessary. Cable ties may be used for restraint.
The cabling ability of Hep2O ® enables easy installation through noggins,
studs etc., and in internal plasterboard/studding walls. Simply carried out,
with tails left exposed prior to the plasterboard being installed, this is
especially useful for ‘microbore’ plumbing (see page 20).
17
Sitework
Pipe Support cont.
Partition systems on the market have the built-in facility for cabling
electrical wiring and this can be utilised for Hep2O ® pipework.
Bending Radius:
Hep2O ® pipe can be easily manipulated by hand to form bends of any
angle. In order to prevent any long term detrimental effect on the
material, the curvature of Hep2O ® pipe should be not less than shown
in Figure No. 24.
Figure No. 24 Minimum Bending Radii (8 x pipe diameter)
A
Nominal Diameter
A
mm
10
15
16
20
22
28
mm
80
120
128
160
176
224
Pipe Installation in Exposed Locations
Hep2O ® pipe expands as temperature increases causing it to undulate
along its length. This can be visually unacceptable in the case of long exposed
runs. Long runs of exposed pipe are unusual in new build where pipework is
generally concealed, but may occur in refurbishment.
G
If the pipework is exposed there are a number of options open to the
installer to ensure that a neat, tidy job is achieved:
G
Hep2O ® pipework, if exposed, can be boxed in (PVC-U trunking or
preformed plywood profiles are generally used).
G
Long runs of exposed Hep2O ® may be unsightly as a result of
expansion and therefore the installer may choose to use copper pipe in
this instance.
Pipe Installation in Concealed Locations
Hep2O ® pipework can easily be installed in concealed locations in floors,
roof spaces etc. Any expansion which may occur will have little mechanical
effect, this being absorbed within the pipe length as undulation which may be
ignored. Undulation of Hep2O ® pipe which may occur naturally as a result
of expansion, or installation through joists, will not lead to airlocks.
Installation in difficult locations is aided by the cabling ability of Hep2O ®
pipe. If adequately supported, Hep2O ® in concealed locations needs only to
be clipped for system alignment e.g. at changes in direction.
Where convenient, cable ties can be used to restrain pipes for system
neatness (care should be taken not to overtighten the tie.) The pipe should
be able to slide freely through the tie to facilitate thermal movement.
18
Sitework
Pipes through Walls and Floors
Whenever Hep2O ® passes through brickwork, stone or concrete the pipe
should be sleeved. The annular gap between the pipe and the sleeve should
be filled with a resilient material to provide effective fire stopping and
prevention of noise transmission from one room to another.
Laying of Pipe in Floor Screeds
Unlike metal pipes Hep2O ® is not affected by cement, limes, mortars,
concrete and general corrosion. However, account should be taken of the
requirements of the Water Byelaws which require distribution pipework to
be accessible - facilitating its removal and replacement.
(See page 23 conduit system).
Pipes Adjacent to Metalwork
When running Hep2O ® adjacent to or through metalwork, it is
important to ensure that the pipe cannot make contact with any sharp
edges as this could cause damage during thermal movement. Any of
the following preventative measures would be acceptable:
G
For a pipe passing through a small hole drilled in metalwork, fix a
resilient grommet in hole.
G
For a pipe passing through a large hole in metalwork or adjacent to
a sharp edge, fix an extruded flexible profile to metalwork.
G
Provide sufficient local pipe clipping to prevent contact between pipe
and metalwork.
G
Run pipe within a conduit.
4
Piping Noise Reduction
Problems with noise are frequently experienced with systems incorporating
rigid pipes. Hep2O ® pipe does not transmit noise and with careful
installation to reduce the source of noise to a minimum, Hep2O ® can be
installed to run almost silently. For example:
G Noise can be caused by friction between a pipe and an adjacent or
surrounding material, this often occurs with rigid pipes installed beneath
timber or chipboard flooring. The use of Hep2O ® can greatly reduce
this effect. Holes should be drilled through joists (see this section page
13) of sufficient diameter to allow Hep2O ® pipe to slide freely. This will
prevent any friction between underside of floor, and more importantly
avoid ‘ticking’ and creaking normally associated with thermal
movement of rigid pipes.
G
Noise can be caused by pipes knocking together or knocking on hard
surfaces in close proximity. Unlike rigid pipes, the inherent elasticity of
Hep2O ® would cushion the impact causing less impact noise and
absorbing vibrations, preventing the transmission of any sound along pipe.
G
Similarly noise from ‘water hammer’ resulting from abrupt stoppage of
water flow (typically by closure of quarter turn valves, solenoids and
reverberating ball valves) is normally absorbed by Hep2O ® and is not
transmitted along pipes.
NB: Noise generated by central heating pumps is rapidly absorbed by pipes
and can be significantly reduced when compared with rigid systems.
19
Sitework
Manifolds/Microbore Plumbing
Hep2O ® Manifolds are designed for use on
microbore central heating systems and can also
be used for hot and cold water.
The Hep2O ® Manifold in one fitting brings
together multiple 10mm pipe connections on
the flow or return pipework to one area of a
building, enabling easy access when used in
conjunction with the Hep2O ® Routabout
system. Thus providing instant access below sheet
flooring installations for future system modifications
or extension.
A comprehensive range of Hep2O ® Manifolds is available (Figure No. 25)
and these manifolds can be connected in series allowing any number of
outlets.
Installation and Performance Benefits
G The Hep2O ® 2 Port and 4 Port Manifolds provide a cost effective way
of connecting 22mm pipe to 10mm pipe as they reduce the number of
fittings required.
G
Fewer fittings reduces installation time.
G
One of the main advantages of the new Hep2O ® Manifolds is that they
are manufactured from polybutylene, an extremely robust yet lightweight
material and are therefore, much easier to install.
G
The lightweight Hep2O ® polybutylene manifolds enable the pipe to be
suspended between joists without fear of dragging the pipe down.
G
Blanking Pegs can be used to close off any unused sockets.
Figure No. 25
Hep2O ® Manifold Range
20
Sitework
Underfloor Heating Systems
Hep2O ® Underfloor Heating Pipe is designed for
use in underfloor central heating systems. It is
supplied with an oxygen diffusion barrier
offering maximum protection against oxygen
ingress.
The design of the barrier within the wall of
the pipe offers significant advantages over
underfloor pipes with an external coating.
Hep2O ® Underfloor Heating Pipe is available in
16mm and 20mm diameters, in a variety of coil
lengths (Table 5).
Hep2O ® Underfloor Heating Pipe is manufactured principally from
polybutylene (PB) which is more flexible than other materials
commonly used for underfloor heating, such as crosslinked
polyethylene (XLPE) or polypropylene (PP). The inherent flexibility of
polybutylene allows sub-floor heating circuits to be installed quickly
and easily without the use of tools or heat sources. Hep2O ®
Underfloor Pipe is available in a variety of coil lengths, enabling the
installation of long continuous circuits, with minimal pipe wastage.
Hep2O ® Underfloor Heating Pipe is corrosion resistant and
unaffected by corrosion inhibitors when used as recommended by the
manufacturer.
For further information on Hep2O ® Underfloor Heating Systems visit
www.hep2O.co.uk
Figure No. 26
4
Figure No. 27
Table No. 5 Underfloor Heating Pipe Lengths
16mm
60m
80m
100m
150m
200m
500m
21
Sitework
Routabout
Hep2O ® Routabout Hole Cutter
This unique system solves the problem of underfloor access found by all
builders, plumbers and other trades. A 250mm diameter opening can be
cut and made good in minutes. Designed for use in new or existing 18mm
& 22mm chipboard or similar floors, the Routabout cuts only the
thickness of the board, thus leaving no waste and the piece cut out is
used to make good the floor.
You will also need:
1 x 1/4 inch or 1/2 inch collet to fit a medium sized plunging type
router (not supplied).
G
G
1 x 30mm (outside dia) guide bush - fitted to router (not supplied).
G
Router (750 watts or above).
G
Routabout rotating template.
Figure No. 28
G
Router
G
Tungsten router cutter
G
Routabout rotating template
G
Routabout spacer ring
Figure No. 29
G
Routing the flooring sheet using the
Routabout rotating template.
Figure No. 30
G
The routabout spacer ring provides
access in the floor sheet to the
pipework.
Figure No. 31
G
22
The chipboard cutout fits snuggly into
the spacer ring, leaving a neat access.
Sitework
Conduit Systems
The Hep2O ® Conduit system allows pipe and
fittings to be installed directly into concrete
floors or into walls whilst complying with the
requirements of the Water Regulations.
The flexible conduit allows Hep2O ® to be
withdrawn for inspection, and junction boxes
allow maximum accessibility to fittings for
inspection and possible removal.
To allow pipework to be easily replaced or terminated in the future only
Demountable fittings should be used within the junction boxes. Hep2O ®
22 x 10mm manifolds can be used in conjunction with spigot tees in 22
x 15mm and 15 x 10mm sizes to build up various manifold
configurations. If any bent sections of conduit pipe are formed in an
installation then future replacement of the Hep2O ® is likely to require
the use of a ‘draw cable’.
In this event the draw cable should be attached to one end of the
Hep2O ® before it is pulled out from the other end. Replacement of a
new section of Hep2O ® pipe may require two operatives; one pulling
the draw cable which is attached to the pipe end and the other person
feeding-in the new length from the opposite end. Future replacement will
be easier if conduit bends are kept to a minimum and any radius kept as
large as practicable.
The system consists of two sizes of flexible conduit, junction boxes with
lids and terminal fittings.
Holes can be cut in the sides of the junction box at the appropriate
position to accommodate the conduit which simply clicks into position.
Hep2O ® Conduit Pipe is available in the sizes shown in Table No. 6.
Table No. 6 Conduit and Pipe in Pipe Lengths
10mm
15mm
22mm
25m
50m
28mm
Conduit Pipe (Black Conduit)
Pipe in Pipe (Red and Blue Conduit)
25m
50m
Hep2O ® Pipe in Pipe System (Figure No. 32) incorporates Hep2O ®
Barrier Pipe in a pre-sheathed conduit ready for underscreed installation,
thus allowing the installer to save time and effort whilst complying with the
current regulations. Hep2O ® Pipe in
Pipe is available in the handy site
managable coil lengths shown in
Table No. 6. The Pipe in Pipe system
is available in red and blue conduit to
aid the identification of the pipe.
Figure No. 32
Pipe in Pipe Coil
23
4
Sitework
Installation Recommendations
The Hep2O ® pipe should be fed into position at
the same time as the conduit system is installed
i.e. before screeding. The conduit system should
not be installed on sub-floors a long time in
advance of screeding as damage by site traffic
could occur.
The junction box is designed to gain access to
pipe fittings, and to allow pipe cross-overs (which
are normally undesirable within the floor screed
material). Dimensions are shown in Figure No. 34.
If required the junction box can be cut in half and installed up against a wall
(Figure No. 35).
The junction box should be drilled using a hole cutter or spade bit, to
allow the conduit to fit snugly and click into position to protrude not less
than 5mm inside the box. Conduit
pipe OD’s are shown in Table No. 7.
NB: The prevention of cold water
becoming warm is a Water
Regulations requirement.
Figure No. 33
Conduit Junction Box HX100
Note:
Central heating pipework should not be run within the
same junction box as cold water pipework unless there is
sufficient space to fix adequate thermal insulation, in
order to prevent the warming of cold water.
Figure No. 34
Junction Box Dimensions
Figure No. 35
Cut Junction Box
377mm
Hep2O pipe to
radiator or
sanitary appliance
Plan
202mm
Junction Box Lid
170mm
340mm
Side
Section
75mm
Hep2O elbow
322mm
165mm
End
Section
160mm
75mm
150mm
N.B:
1. All dimensions are nominal.
2. Lid recess is designed for 8mm thick plywood.
24
Junction Box cut in
half and secured to
sub floor
Sitework
Installation Recommendations cont.
Table No. 7 Drill Size for Conduit Box Holes
Hep2O Size
(mm)
10 & 15
Conduit Code
Conduit
OD (mm)
HXC25/15 - HXC50/15 - HXXC50/10 - HXXC50/15
25
22
HXC25/22 - HXC50/22 - HXXC50/22
34
28
HXXC25/28
42
The junction box should be fixed to the sub-floor (in order to prevent
movement or ‘floating’ during screeding) the fixings should be provided with
suitable washers. The junction box should be fixed so that the lid (when
fitted) will be level with the adjacent floor finish.
For uneven sub-floors or where the screed depth exceeds the junction
box height, the box should be provided with suitable packing support
under the base.
Figure No. 36 Typical Section Showing Junction Box Installed on
Hot and Cold Water Distribution Pipes at Tees
Finished
floor
level
Conduit
Pipe
Junction box lid,
drilled and secured
by fixing screws
Junction box
secured to the
sub-floor
Small insulating
pad, cut and
placed to
separate pipes
at cross-over
Tee on cold
water pipe
Thermal insulation
barrier formed
across junction box.
(if necessary).
Tee on hot
water pipe
Remember:
No thermal insulation would be necessary where the
junction box is used solely for central heating pipes.
To facilitate the possible removal and replacement of Hep2O ® within the
conduit system, conduit pipe should be installed without joints and should
ideally run in straight lines between junction boxes. Where bends are
unavoidable there should be not more than two changes of direction
between adjacent junction boxes.
Conduits carrying cold water pipes should not touch conduits carrying hot
water or central heating pipes.
When running conduits within floor screeds the recommended gap between
such conduits should not be less than 50mm (see Figure No. 37, page 26) in
order to prevent the warming of cold water.
The conduit system should not contain unused water pipes which remain
connected to water systems. Redundant pipework will result in water
stagnation which would pose a risk to health.
25
4
Sitework
Installation Recommendations cont.
Figure No. 37 Minimum Spacing for Cold Water Conduit in Floor Screeds
50mm
(min)
Conduit for cold water pipe
Conduit for hot water or central heating pipe
Conduit pipes should be fixed to the sub-floor by using suitable straps to
prevent movement. Conduit pipes for cold water systems should not be
run in floor screeds which incorporate underfloor heating ‘loops’.
Figure No. 38 Conduit Terminal Fittings
HX101/15
15mm Conduit Terminal
HX103A
Terminal Fitting Plate
HX103
Terminal Back Plate
For terminating the conduit pipe at wall and floor finish level for direct
15mm connections to appliances, a conduit terminal fitting is available
(HX101/15). For floor terminations the plastic housing may be drilled
through the base to allow fixing. Floor termination procedure is shown in
Figure No. 39.
Figure No. 39 HX101/15 Conduit Terminal Installation Procedure
26
Sitework
Installation Recommendations cont.
For wall terminations two alternative fixing plates are available. The
HX102 Terminal Fitting Plate and HX103 Terminal Back Plate, shown in
Figure No. 38. The HX103 can be used to mount two terminals side by
side (Figure No. 40), or it can be easily split to form two single plates.
The HX103 Terminal Back Plate can also be used to fix a maximum of
four Wall Plate Elbows. (Figure No. 41).
Figure No. 40
HX101/15, 15mm Conduit Terminal
and HX103 Terminal Back Plate
Figure No. 41
HX103, Terminal Back Plate and
HX6/15 Wall Plate Elbow
4
Figure No. 42 Installation of HX102 Terminal Fitting Plate and
HX101/15, 15mm Conduit Terminal
27
Sitework
Hep2O ® Within Dry Lined Walls
Installers have found that feeds to radiators run in microbore copper can be
accommodated behind ‘dot and dab’ plasterboard to give a pipe-free
appearance within the room. Pipes run in 10mm Hep2O ® are equally
suited to this application but will not be susceptible to damage such as
dents or kinks which can be caused on ‘soft’ copper by following
tradesmen. The penetration through the plaster board for a radiator
connection can be achieved by using a 10mm SlimLine elbow (HX5/10)
together with a Fitting Clip (HX84/10 see Figure No. 44) or alternatively a
dry lining box can be used (see Figure No. 46).
Another method when using 10mm Hep2O ® Pipe is to utilise the HX111
or HX113 Radiator Outlet Cover Plates. The Cover Plates (HX111 &
HX113) and Radiator Outlet Back Box (HX109 Plastic, for stud wall;
HX110 Metal, for solid wall) allow for a superior and easy to install method
of connecting radiators. The box is fixed in a central position behind the
radiator with the 10mm pipes dropping out to the radiator valves. This gives
a smart professional finish where little or no pipe is seen and for new build
provides an anchor point for the pipe work prior to plastering/boarding.
Figure No. 43 Installation procedure of HX111 Cover Plate
28
Sitework
Hep2O ® Within Dry Lined Walls cont.
The following is good practice for ‘first-fix’ pipework:
G Radiator ‘drops’ should be run vertically, side by side, at one end of
the radiator position.
G
Lateral pipes should be run horizontally in line with plasterboard
penetrations.
G
Avoid running pipework along any obvious fixing zone ie. at skirting level.
Figure No. 44 10mm Fitting Clip (HX84/10)
Two 5mm
fixing holes,
one each
side
4
For fixing pipework to lightweight blockwork the HX65 pipe clip is not
suitable for fixing directly to such walls because of
the low pull-out resistance of the nail. In such
circumstances a more secure hold can be
achieved by fixing wooden dowels at each
clip position. The dowels should be the solid
type with a serrated surface and of sufficient
size (not less than M8 x 30mm).
Holes should first be drilled in the blockwork
using a drill bit size which provides a tight
fitting hole for the dowel, taking care not to overdrill the hole depth. After tapping in the dowels the pipe
clips can then be fixed by knocking the nail into the centre of each dowel.
Figure No. 45
Radiator Pipework in 10mm Hep2O ®
Within Dry Lined Walls
Thermostatic
Radiator Valve
(HX71/10)
90° M & F
Elbow
(HX4/10)
Pipe Clip
(HX84/10)
Skirting
board
90° Elbow
(HX5/10)
Radiator
Draincock
(HX23/15)
90° M & F
Elbows
(HX4/10)
29
Sitework
Hep2O ® Within Internal Drywall
Systems
Hep2O ® can easily be cabled within timber studwork and within wall
systems (eg. Paramount Board) during construction. This method is often
used for running feeds to radiators or where concealed plumbing is
necessary eg. supplies to a recessed shower mixer.
A connection for a radiator can be made by using a secured elbow in the
wall and fixing a plastic snap-on escutcheon to neatly cover the hole
through the wall surface.
Alternatively for 10mm Hep2O ® a dry lining box can be used which gives
the advantage of allowing minor alignment adjustment to the ‘tail’ during
‘second-fix’ (see Figure No. 46) and allowing access to the elbow. ‘First-fix’
pipework should follow the good practice advice in the text headed
‘Hep2O ® within Dry Lined Walls’ on this page, and ‘Pipes Adjacent to
Metalwork’ on page 19.
Figure No. 46 Radiator Connection using 10mm Hep2O ® and a Dry
Lining Box within a Drywall
10mm
Hep2O
Single socket
elbow, use
SlimLine type for
neatness
(HX4/10)
Dry lining box and cover plate
(single gang electrical fitting)
Demountable elbow (HX5/10)
Non-load bearing
internal drywall system
NB: This solution can also be used where the radiator is fed from below
in which case the risers should be located directly under each box.
Hep2O ® Within Timber Framed and
Steel Framed Buildings
Hep2O ® is ideal for use within both timber framed and steel framed
buildings. For recommendations applicable to internal partition walls refer
to the text headed Hep2O ® within Internal Drywall Systems’, on page 30.
Running pipework of any material within the external wall of framed
buildings should not be done without consideration of the following:G
If a leak occurred on a pipe it should be discovered without delay as
seepage within a wall may damage the structural frame and affect the
performance of insulating materials.
G
Water Byelaws require that pipes should not be fixed in a situation
where leaks could be undetected for long periods.
30
Sitework
Hep2O ® within Timber Framed and
Steel Framed Buildings cont.
G
Where a pipe passes through a vapour control layer the installation
method should allow possible future replacement of pipe without
affecting the integrity of this layer.
G
Pipework should be installed on ‘warm’ side of thermal insulation layer.
To comply with the foregoing criteria, pipework should be either run within
a recessed duct designed by the Architect or run within a conduit system.
Whichever method is used it is necessary to consider the detail at the
junction between the wall and floor to avoid floor joist problems and to
agree pipe penetrations at header rails/bottom rails. For radiator
connections, 10mm Hep2O ® within conduit pipe may be used (see
Figure No. 47)
The suggested installation sequence is as follows:
4
1. Prepare sketches showing setting-out dimensions for each dry lining
box including height and hole size.
2. Fix each conduit pipe to noggins using suitable straps or cable ties.
Fixings at 1m centres are adequate for vertical conduit pipe.
Horizontal runs and bends more than 45° should be avoided.
3. To allow future installation of dry lining boxes, each conduit pipe end
should be left approximately 100mm longer than box position and
should not be fixed closer than 600mm to the box.
4. Install the main ‘first-fix’ pipework leaving joints below floor access
covers to allow connection to conduit pipework during ‘second fix’
work.
Figure No. 47 Radiator Connection Using 10mm Hep2O ®
Within Timber or Steel Framed External Wall
Plasterboard
When cutting
vapour control
plasterboard
care should be
taken not to
displace vapour
control
material
Hep2O Single
Socket SlimLine
Elbow
(HX4/10)
10mm
Hep2O
15mm
(nominal)
Conduit Pipe
The conduit
should be
firmly
terminated
within dry
lining box
Demountable
elbow
(HD5/10)
Dry Lining Box
and Cover Plate
(single gang
electrical fitting)
Insulating material
31
Sitework
Hep2O ® within Timber Framed and
Steel Framed Buildings cont.
5. Using setting-out dimensions on sketches, holes in plasterboard can be
cut to allow each conduit pipe to be pulled out through the surface
during plasterboard fixing work.
6. During ‘second fix’ each dry lining box is installed by drilling a 26mm
diameter hole for 15mm (nominal) conduit pipe. The conduit can then
be inserted through hole in box and should ‘click’ into position leaving
one or two conduit ‘ribs’ inside box.
7. Slide a length of 10mm Hep2O ® pipe through conduit pipe from the
floor access above. Pull out enough Hep2O ® from dry lining box to
allow a sufficient hand grip for jointing. Connect a demountable elbow
to pipe then slide whole assembly through plasterboard hole and
secure box into position. Conduit pipe should ‘snake’ within void to
take up slack leaving Hep2O ® protruding out of box.
8. Pull Hep2O ® pipe backwards from floor access panel until elbow is
central within dry lining box. Cut pipe to length and connect to
Hep2O ® joint left during ‘first fix’.
Timber or Steel Framed Buildings - General Advice:
Holes through timber joists should be drilled in accordance with Figure
No. 19 & 20, on page 15. Holes through timber studs should be drilled in
accordance with Figure No. 48.
;;
;;
Stud Height ‘H’
0.25 x H
D
QQ
@@
;;
0.4 x H
Care should be taken
that pipework passing
through compartment
walls or floors does not
impair the fire resistance
of the property.
Holes should
be located in
these zones
and drilled at
centre of stud
depth
0.25 x H
Services within
compartment or party
walls should be avoided
so as not to impair fire
resistance or acoustic
properties.
0.4 x H
Within steel framed buildings pipework should be routed through
preformed holes in steelwork wherever practicable (and where provided).
No holes should be formed in steelwork without the approval of the
Architect. Pipework
Figure No. 48 Limitations of Drilling
passing through
Studwork
steelwork should be
protected from damage
(refer to the text headed
‘Pipes Adjacent to
Metalwork’ on page 19).
Do not lay pipework in
areas where plasterboard
is likely to be fixed.
Maximum Diameter of Holes = 0.25 Depth of Stud ‘D’
32
Compatability and Connections
Connection to Metric Copper Pipe
Hep2O ® fittings have been designed to form reliable joints with metric
copper tube which conforms to BS EN 1057 - R520. Copper pipes should
be cut with a wheel cutter. Before jointing, copper pipe ends should be
inspected to ensure they are free from burrs or swarf (which could damage
the ‘O’ ring). It is also possible to connect 10mm BS EN 1057 - R220
copper tube into Hep2O ® fittings providing the tube end is carefully
prepared. R220 copper tube is ‘soft’ and therefore susceptible to becoming
misshaped or dented if it is not handled with care on site. Therefore the
R220 tube end should be inspected for any signs of damage prior to jointing,
as deformity of the tube could damage the ‘O’ ring whilst jointing, or
otherwise affect the joint seal. R220 tube should be cut with a mini wheel
cutter, and then a chamfer should be filed on the pipe. Rinse away the
remainder of any copper filings and dry-off.
NB: Mark the joint depth on the copper pipe before jointing, refer to page
9.
5
Cut copper pipe using
a wheel cutter
Inspect ends to
ensure free from
burrs or swarf
Insert copper end
protector
Mark joint depth on
copper pipe before
jointing
Push pipe firmly into
fitting
Tug back on the pipe
to ensure grab wedge
engages properly
DO
G Use a wheel cutter.
G Check ends free from burrs or swarf.
G Insert copper end protector (HX61/15 & HX61/22).
G Mark joint depth on copper pipe.
G File end of pipe if using a hacksaw.
33
Compatability and Connections
Connection Using Compression Fittings
Hep2O ® pipe is suitable for connecting to compression fittings complying
with BS EN 1254. Cut the Hep2O ® pipe with the recommended cutters
and proceed as shown below.
Insert support sleeve
into pipe
Ensure pipe is fully
inserted
Apply PTFE if required
Tightening nut
Note:
Hep2O ® pipe will not rotate in a compression fitting
after tightening
DO
G Use a support sleeve when making a compression joint.
G Ensure pipe is fully inserted.
G Use PTFE tape over olive if lubrication required.
G Copper olives are preferable to brass ones.
DON’T
G Use oil based jointing compounds.
34
Compatability and Connections
Connections Adjacent to Capillary Joints
When using Hep2O ® pipe or fittings adjacent to capillary joints it is
preferable to carry out the soldering work before the Hep2O ® is installed.
If it is not possible to undertake the work in this sequence then the following
precautions should be observed:
DO
G Keep flame or soldering irons away from Hep2O ®.
DON’T
G Allow flux to run onto Hep2O ®. Flux runs inside pipe
may occur during soldering, this effect can be reduced
by not using excessive amounts of flux and by applying
flux to copper tube end only.
5
G Allow hot solder to come into contact with Hep2O ®.
Trade Tip:
To prevent overheating of Hep2O ® by conduction of heat along
copper pipe, where necessary, wrap a damp cloth around copper pipe
to minimise this effect.
Note:
Systems should be flushed with water to remove any
internal flux residues.
Connection to Imperial
Copper
When connecting to 3/4’’ imperial copper
Hep2O ® offers a special ‘O’ ring straight
adaptor (HX3A/22) which accepts 22mm pipe
at one end and 3/4’’ imperial at the other end.
Special ‘O’ rings for use with 3/4’’ imperial pipe
(HX52) are available. These can be used to replace
the standard ‘O’ in Hep2O ® fittings.
See Re-assembling a joint (page 42-43).
( 3/8’’, 1/2 ‘’ & 1’’) imperial pipes can be connected using standard Hep2O ®
fittings.
DO
G Use an adaptor (HD3A/22) or imperial ‘O’ ring (HX52)
when connecting to 3/4’’ imperial copper.
35
Compatability and Connections
Connection to Chrome Plated Copper or
Stainless Steel Pipe
Hep2O ® fittings cannot be connected directly to chrome
plated copper or stainless steel, because of the relative
surface hardness of these materials.
Therefore the following procedures must be followed:
Chrome Plated Copper: Use compression fittings as shown on page
34.
Stainless Steel: Use compression fittings as shown on page 34.
Note:
Do not use Hep2O ® fittings directly onto Stainless Steel
or Chromium plated pipe.
Connection to Brass Spigots
The only brass spigots which are suitable for jointing into Hep2O ® fittings
are those within the Hep2O ® Range. Brass spigots designed for compression
or capillary joints do not have the necessary joint grooves and are too short.
Connection to the Acorn® System
Hep2O ® is fully compatible with its predecessor the Acorn® system
previously manufactured by Bartol.
Pre 1984 Acorn® 22mm pipe was manufactured with a thicker wall and
requires a different support sleeve. If carrying out remedial work on such an
Acorn® system please contact our Technical Advisory Service
Tel: 0870 460 5578 Fax: 0870 460 5579 for advice.
Remember:
Hep2O ® Pipe is fully compatible with all versions of
Hep2O ® Fittings.
Note:
Internal components of the current Hep2O ® Fitting (Cap, BiTite Grab
Wedge, Wedge Support Ring and ‘O’ ring) are not in any way
compatible with original Hep2O ® Fitting components (Cap, ‘O’ ring,
Spacer Washer and Grab Ring) and therefore bodies and components
must NOT be mixed.
For further information contact our Technical Advisory Service –
Tel: 0870 460 5578.
Connection to Plastic Pipes
Hep2O ® should not be used in conjunction with other manufacturers
plastics pipe and fittings as dimensional tolerances and quality control cannot
be guaranteed by Wavin.
36
Compatability and Connections
Connection to Incoming Service Pipes
Water may enter a property through a variety of pipe materials. In recently
developed properties the water is typically brought to a residence in blue
MDPE (medium density polyethylene) pipe. However, in renovation of older
properties this pipe may well be made of one of a number of metals. The
method of converting from the service pipe to Hep2O ® differs depending
on the pipe material of the service pipe.
The following guidance is applicable to blue MDPE Pipe to BS 6572:G
For 20mm MDPE use a polyethylene 20 x 1/2” BSP male adaptor (Code
20PEAM05) together with a MDPE pipe liner (Code 20PELIN), Hep2O ®
female adaptor (Code HX30/15) and Hep2O ® stopcock (Code
HX36/15). (See Figure No. 49).
G
For 25mm MDPE use a Hep2O ® x MDPE stopcock (Code HX43/22)
together with an MDPE pipe liner (Code 25PELIN). (See Figure No. 50).
Alternatively if you wish to take advantage of the rotatability of
Hep2O ® joints by turning the stopcock towards the wall when not
in use, then proceed as follows. Use a polyethylene 25 x 3/4” BSP
male adaptor (Code 25PEAM07) together with a MDPE pipe liner
(Code 25PELIN), Hep2O ® female adaptor (Code HX30/22) and
Hep2O ® stopcock (Code HX36/22). (See Figure No. 51).
NB: Details of MDPE pipe, fittings and jointing instructions are
contained in separate literature which can be obtained by contacting
our Literature Service Hotline Tel: 01249 766333 Fax: 01249 766332.
Figure No. 49
Rotatable Stopcock
HX36/15
HX30/15
Adaptor
20mm MDPE
HX43/22
HX36/22
HX30/22
Adaptor
25mm MDPE
25mm MDPE
Figure No. 50
Figure No. 51
Non-rotatable Stopcock
Rotatable Stopcock
37
5
Compatability and Connections
Connection to Incoming Service Pipes
cont.
NOTES:
G Where a common supply pipe serves two or more dwellings a double
check valve (Code HX72) is required directly after stopcock in each
dwelling to comply with Water Byelaws.
G
A drain-cock (Code HX32) should be fitted immediately after stopcock or
after double check valve where provided to comply with Water Byelaws.
G
For sealing screwed joints on adaptors apply PTFE to threads.
Alternatively a PE (polyethylene) to copper compression stopcock can be used.
The information on using compression fittings on Hep2O ® pipe should be
carefully noted. (See page 34).
For metal pipes an appropriate stopcock should be used with a compression
outlet to 15 or 22mm copper. Hep2O ® can then be fitted directly to these
outlets carefully noting details in Connections to Compression Fittings (See
page 34).
Connection to Steel Pipes and Threaded
Bosses
In order to facilitate connection to male and female iron threads, four
adaptors (HX28/HX29 Socket Adaptors, HX31/HX30 Spigot Adaptors) are
available in the Hep2O ® range. This enables connection to a wide range of
different materials. (See Figure No. 52).
HX28
HX29
HX30
HX31
Figure No. 52
Adaptors for Connecting to Steel Pipes and Threaded Bosses
Connection to Appliances
When connecting to appliances and dishwashers always use Hep2O ®
appliance valves (HX38C/15, HX38H/15). The Hep2O ® pipework used to
service these appliances should be clipped in accordance with the
recommended clipping distances (see page 17) using screw-type clips (HX85).
Figure No. 53
HX85
Pipe Clip - Screw
38
HX38C/15 (Cold) HX38H/15 (Hot)
Connecting Appliance Valves
Compatability and Connections
Connection to Draw-off Taps
When connecting to draw-off taps having a male threaded ‘tail’ use either
the Demountable or SlimLine Hep2O ® tap connector. Do not use any
jointing compound on the jointing shoulder, use only the washer provided.
When using the wall plate elbow or the 1/2” x 3/8” BSP adaptor the threads
should be sealed by applying PTFE tape to the male threads.
Figure No. 54 Tap Connectors
Demountable - Straight and Bent Tap Connectors
15mm x 1/2”
HD25A/15
15mm x 1/2”
HD27/15
15mm x 3/4”
HD25B/15
22mm x 3/4”
HD25B/22
Wallplate Elbow - (HX6/15) used with Outside Taps
5
SlimLine - Straight and Bent Tap Connectors
15mm x 1/2”
HX25A/15
15mm x 1/2”
HX27/15
15mm x 3/4”
HX25B/15
Connection to Ancillaries (Pumps,
Valves, etc.)
When connecting Hep2O ® to ancillaries it is important to follow the
guidance in the section ‘Connection Using Compression Fittings’ (Page 34).
Due to the flexibility of Hep2O ® the pipework must be clipped adjacent
to the outlets of the pumps and valves using Hep2O ® screw pipe clips
(code HX85). This ensures adequate support and reduces vibration in the
majority of cases. Where it is felt that the weight
of the pump merits extra support, metal
brackets should be used. Where the size of the
pump and/or valve requires fixing at a greater
distance from the wall than can be
accommodated by the pipe clip alone, then this
can be augmented with a pipe spacer (HX86),
which will allow a greater ‘stand-off’ distance
whilst maintaining security.
Figure No. 55
Connection to Pump
39
Compatability and Connections
Connection to Storage Vessels and
Radiators
When connecting Hep2O ® pipe to cylinders, radiators etc. it is always
recommended that Hep2O ® fittings are used wherever possible.
The Hep2O ® range of fittings includes thermostatic, wheel head and
lockshield radiator valves, double check valves, tank connectors, gate valves,
stopcocks and cylinder connectors.
If the use of compression fittings is unavoidable then the jointing instructions
outlined in the section, ‘Connection Using Compression Fittings’ (page 34)
should be carefully followed.
Do not use any jointing compound on the jointing shoulder of the cylinder
connector, use only PTFE tape.
Do not use any jointing compound when fitting tank connectors, use only
sealing washers (not provided).
Figure No. 56 Tank and Cylinder Connectors
22mm x 1” BSP
HX34/22
15mm and 22mm
HX20/15 HX20/22
Figure No. 57
G
Radiator or Lockshield Valve
G
HX73/10
G
HX73/15
Figure No. 58
G
Thermostatic Radiator Valve
G
HX71/10
G
HX71/15
Figure No. 59
40
G
Radiator or Lockshield Valve
(HX73/10)
G
Straight Radiator Connector
(HX77/10)
G
Radiator Draincock (HX23/15)
Compatability and Connections
Connection to Boilers and Heaters
Where boilers incorporate a high limit cut out thermostat, pump overrun
device, and have connections outside the boiler casing 350mm from the
heat source, direct connection can be made to
Hep2O ®. Typically these boilers contain a copper
heat exchanger and are low water content
boilers.
Where any one of the above criteria for
direct connection to a boiler cannot be met a
minimum one metre run of copper pipe
should be installed between the boiler and the
start of the Hep2O ® system.
In all cases (including instantaneous water heaters,
caravan heaters etc.) care should be taken to ensure
that appliances have the appropriate thermostatic controls and cut outs to
ensure that operating conditions do not exceed the temperature and
pressure limits laid down for Class S pipe (see Table No. 1, page 3). For
any type of back boiler all water connections should be extended from
the appliance to the outside of the fireplace opening in copper tube.
In these instances, where the heat output may be uncontrolled, a
minimum one metre run of copper pipe should be used between the
boiler and the start of the Hep2O ® system.
Any gravity circuit of a solid fuel boiler should always be installed in
copper.
Regulations require that metal pipe be used as discharge pipe from
temperature/pressure relief valves on unvented water heaters, to or from a
tundish or from safety valves on sealed central heating systems. On sealed
systems where the safety valve is not provided within the boiler casing, the
pipe between the safety valve and the boiler should be in copper.
All boiler connections should be made in accordance with the
requirements of BS 5955, Part 8.
On heating systems where normal circulation may be drastically reduced
(eg. thermostatic radiator valves fitted throughout), then a bypass should be
fitted to the circulation pipework preferably controlled by an automatic
differential pressure bypass valve.
During commissioning it is important to ensure that all trapped air is
purged from the heating system before the boiler is operated. ‘Pockets’ of
air can affect proper circulation and impair the correct operation of boiler
temperature controls which could cause severe overheating.
41
5
System Modifications
Fitting Detachment
Re-using a demountable fitting
Figure 60
Unscrew the retaining cap and
pull the pipe clear of the fitting.
Figure 61
Remove the ‘O’ ring and wedge
support ring (if applicable) from
the pipe.
Figure 62
Using the wedge removal tool,
slide the grab wedge from the
pipe. Provided it is undamaged it
can be re-used.
Figure 63
Re-assemble the fitting, inserting
the ‘O’ ring, the wedge support
ring (if applicable) and then the
grab wedge, with the flat face
against the wedge support ring –
replace the cap hand tight.
Re-assembling a Hep2O ® joint
To re-assemble the fitting:
G If demounting
V a fitting, start with a fresh piece of pipe. cut off pipe at
next full ‘ ’ mark from end.
G Check each component for damage. Replacement components are
available. Refer to current Trade Price List.
G Ensure all components are clean.
G Apply a small amount of Hep2O ® Silicone Lubricant (Code HX200)
to ‘O’ ring before insertion of fitting.
G Insert the ‘O’ ring into the fitting body until it rests on the ledge at the
bottom of the socket.
G Place the wedge support ring so it sits above the ‘O’ ring.
G Insert the grab wedge into the wedge support with the flat face of the
grab wedge facing down.
G Replace the retaining cap and hand tighten.
G The fitting is now ready for use.
42
System Modifications
Note:
G Pipe should be rotated in cutters during operation.
G Support sleeve is an integral part of system and should NEVER
be omitted when using Hep2O ® pipe.
G Once completed Hep2O ® joints can be rotated even under
pressure. Rotatability also enables fittings such as stopcocks and
draincocks to be rotated close to the wall when not in use.
Remember:
If the grab wedge is inserted upside down the pipe will
not enter into the joint.
Figure 64
Retaining Cap
‘O’ Ring
6
Wedge Support Ring
Grab Wedge
Lubrication
All ‘O’ ring seals contained in Hep2O ® fittings have been pre-lubricated
during factory assembly. During normal installation additional lubrication
should not be required. If however the fitting has been dismantled then the
lubricant may have been removed by handling and may require replacing. If
replacement ‘O’ rings are being used (Code HX50, HX51 and HX52) these
are supplied dry and should be lubricated before jointing.
Similarly in particularly difficult locations additional lubricant may assist in
ease of jointing. In these situations Hep2O ® Silicone Lubricant Spray (Code
HX200) must be used to avoid contravention of Water Byelaws and ensure
compatibility with other system materials.
Remember:
Hep2O ® Pipe is fully compatible with all versions of
Hep2O ® Fittings.
43
System Modifications
Alterations
Blanking a fitting is easy with Hep2O ®
SlimLine Hep2O ®
Insert a blanking plug (HX41)
directly into the fitting. When
ready to continue, drain the
system, cut off the top of the
blanking plug where indicated and
attach the next fitting.
Note:
Stainless steel blanking caps will not work correctly in Hep2O ®
fittings with BiTite® grab wedges inside.
Demountable Hep2O ®
Remove the cap and grab wedge
from the fitting. Push the open
end of the blanking peg (HX44)
into the ‘O’ ring. Replace the cap
hand tight.
Removing the Blanking Peg
DO
Remove the cap and blanking peg,
re-insert the ‘O’ ring and wedge
support ring (if applicable) - check
the grab wedge is undamaged.
Insert the grab wedge into the
fitting with the flat face against
the wedge support ring. Replace
the cap hand tight.
G Check the fitting and components are clean.
G Lubricate ‘O’ ring before re-assembly of joint (use HX200
lubricant only).
G Replace end cap and tighten by hand.
DON’T
G Keep new grab wedges loosely amongst tools or pipe
fittings. To avoid damage store in a separate
compartment orcontainer, similarly with ‘O’ rings.
G Under NO circumstances should fitting components be
individually fitted onto the pipe prior to assembly. It is
important that components are correctly located and
the Hep2O ® fitting properly assembled prior to the
insertion of the pipe.
Remember: Hep2O ®‚ fittings are designed to push fit only and
are NOT compression fittings.
44
General Information
Thermal Insulation
Although Hep2O ® pipe has lower thermal
diffusivity than copper, its insulation
requirements are the same as those of copper
and should be in accordance with BS 5422,
BS 6700, Water Byelaws and Building
Regulations Approved Documents. Hep2O ®
pipe is less likely to burst should the water in
the pipe freeze, however should Hep2O ® be
connected to a metal pipe, a metal tap or a close
configuration of fittings (incorporating metal support sleeves) then the
likelihood of a failure due to the expansion of frozen water will be
increased.
Freezing for Maintenance/
System Modification
Hep2O ® pipe can be frozen for maintenance/repairs without damage to
the system. Freezing equipment manufacturers instructions should be
followed. Freeze at a reasonable distance from where pipe is to be cut.
Painting Hep2O ®
Hep2O ® can be painted where this is felt to be necessary, e.g. outdoors to
protect the pipe from sunlight and the effects of ultra violet light.
It is preferable when painting Hep2O ® to use emulsion paint, however, oil
based gloss paint can be used in conjunction with undercoat. Cellulose
based paints, paint strippers or thinners should not be used.
Before painting, ensure all surfaces are clean, free of grease and dry.
Use of Corrosion Inhibitors
Corrosion of metals is a hazard in all installations therefore it is
essential that possible causes of corrosion are kept to an absolute
minimum.
Oxygen will almost always be present in any system as it can enter
through a variety of points such as open header tanks, threaded joints,
valves, pumps and above the bleed point on a radiator.
To provide maximum system protection independent of pipe material, all
heating circuits should be protected by an inhibitor.
Hep2O ® Barrier Pipe incorporates an additional oxygen barrier to reduce
ingress of oxygen through the pipe wall. It is accepted by British Gas and is
eligible to be used in heating systems which specify SuperWarm, GasWarm or
are covered by British Gas Contract Service.
Fernox MB1 and Betz Dearborne Sentinel Inhibitors have been tested and are
suitable for use with Hep2O ®.
Antifreeze
Antifreezes based on Ethylene Glycol mixtures will not have an adverse effect
on Hep2O ®, however if there is any doubt as to the suitability please contact
the Technical Advisory Service –
Tel: 0870 460 5578 Fax: 0870 460 5579 for advice.
45
7
General Information
Electrical Safety
Hep2O ® does not conduct electricity therefore the risk of electric shock
from contact with a Hep2O ® installation is eliminated.
The practice of utilising the metal pipework system for earthing was
discontinued in 1966. However, when Hep2O ® forms a break in the
continuity of existing metal pipework which may have been used for earthing
or bonding, then the electrical continuity should be reinstated by fixing the
bonding lead permanently to both ends of the existing metal pipework.
Remember:
Equipotential Bonding
A Hep2O ® installation requires no more and in many cases needs less
equipotential bonding than metal pipework.
For further information contact the Technical Advisory Service –
Tel: 0870 460 5578 Fax: 0870 460 5579. For information on electrical safety
and the IEE regulations, contact a registered electrical contractor or your local
electrical provider.
Woodworm / Timber Treatment
When treating timber for woodworm or timber rot aqueous based
solutions are generally accepted. But care should be taken to protect and
cover Hep2O ® pipe and fittings prior to any spraying.
It is preferable to carry out any spraying prior to Hep2O ® installation.
Solvent based treatments should not be used.
For further information contact the Technical Advisory Service –
Tel: 0870 460 5578.
46
Special Precautions
External Installations
If Hep2O ® is installed in an external application then the system will
require protection from frost. Although Hep2O ® has lower thermal
diffusivity than copper, insulation requirements are the same
as those of copper and should be in accordance
with BS 5422, BS 6700, Water Byelaws and
Building Regulations Approved Document L.
Hep2O ® pipe is less likely to burst should
the water in the pipe freeze, however should
Hep2O ® be connected to a metal pipe, a
metal tap or a close configuration of fittings
(incorporating metal support sleeves) then the
likelihood of a failure due to the expansion of
frozen water will be increased.
If Hep2O ® is used externally it should be protected from the ultra-violet
radiation in sunlight. If insulation has been installed to avoid freezing this is
sufficient. However, where insulation is not used, painting or covering is
recommended. (See page 45).
Vermin
Extensive testing has demonstrated that vermin do not show a preference for
Hep2O ® over other materials. However, all items which are less hard than the
rodents teeth are liable to be gnawed in vermin infested property, including
electric cables and Hep2O ® pipe. If vermin infestation is suspected then a
reputable rodent exterminator should be consulted. If vermin are present they
may damage Hep2O ® pipework.
Chlorine
High sustained concentrations of chlorine will have an adverse effect on all
plastics pipe. Hep2O ® is not suitable for use in systems where the water
carried in the pipe contains a high concentration of chlorine e.g. swimming
pools or decorative water features. Hep2O ® will not be affected by the
levels of chlorine expected in the UK water supply (typically less than
0.5ppm) Short term chlorination for disinfection will not have an adverse
effect on the system.
8
If long term contact is suspected the Technical Advisory Service should be
consulted – Tel: 0870 460 5578 Fax: 0870 460 5579.
47
Testing
Pressure Testing
Installers should ensure that all non-Hep2O ® products can withstand the
test pressure by checking with other relevant manufacturers.
When testing Hep2O ® pipework systems, the recommended test pressure
is:
G For Hep2O ® fittings with grab wedges – 1.5 times working pressure.
G
For Hep2O ® grab ring and SlimLine fittings – a further test to 18 Bar.
If the system contains ANY grab ring or SlimLine fittings the further test
to a maximum of 18 Bar should always be undertaken.
Care should be taken to disconnect any appliances or fittings that will not
withstand, or will be damaged by testing at 18 Bar.
For testing procedure see below. The duration of the test should be not
less than 1 hour in accordance with BS 6700.
Gauge
Valve 1
Valve 2
Figure No. 65 Pressure Testing
Figure No. 66 Pressure Testing
Kit (HX81)
Pressure Test Procedure:
1. Ensure any non-Hep2O ® components in system will withstand test
pressure.
2. Blank off all open ends using Hep2O ® Blanking Pegs (HX44) or
Blanking Plugs (HX41).
3. Connect pressure hose to system at a convenient point using a
demountable socket.
4. Close Valve V2 and open Valve V1.
5. Fill system to be tested with water ensuring system is completely
full of water (purge all air).
6. Raise pressure to test pressure and close Valve V1.
7. At end of test duration, gently tap gauge with a finger (to ensure pointer
is ‘free’). Read pressure on gauge, no appreciable drop in pressure
should be noticed to indicate the system is watertight.
8. Release Valve V1 and V2 to release pressure from system. Drain system if
necessary.
9. Replace cap and components in socket used for connection to test kit.
Remember!
Pressure Testing is NOT a substitute for making sure the
Correct Insertion Depth of the Tube into the fitting using
either the Chevron marks or a pencil mark has been
achieved. For correct method (see Fig 8, page 10).
48
Special Applications
Boats
The flexibility of Hep2O ®
means it can be cabled
around the interior cavities
of boats and easily hidden
behind bulkheads. Light in
weight, Hep2O ® will not
add unduly to the draft of
the vessel.
There are three key
problems with traditional plumbing in marine craft:
G
Prolonged and damaging vibration from engine and forces of sea may
cause soldered or compression joints to crack or work themselves loose.
Flexibility of Hep2O ® pipe absorbs these damaging forces, and jointing
technology ensures a secure joint will not come loose during its service
life.
G
Electrolytic corrosion may occur as a result of contact established
between dissimilar metals in plumbing system and boat’s construction. This
can cause damage to both. This will not occur with Hep2O ®.
G
Salt water is itself extremely corrosive to most metal plumbing systems
but has no effect on Hep2O ® pipe or fittings.
Caravans
Hep2O ® is ideal for caravan installation where its lightness and flexibility
allows fitting in confined spaces without damage to the fabric of the vehicle,
or adding unduly to the kerbside weight. Resistance to corrosion and freezing
make Hep2O ® an obvious choice for this application.
Exhibitions
The temporary nature of most exhibitions combined with the requirement
that services be run for considerable distances with multiple take-off points,
requires a plumbing system which is not only flexible, but also capable of
regular dismantling and remaking to different layouts. Hep2O ® combining
flexible pipe with demountable joints, offers a unique solution to this
problem, giving a positive cost saving (as little waste is incurred) with the
opportunity to modify the overall design installation to suit short-term
requirements.
Portable Buildings (site cabins, toilets
etc.)
10
Similar in many respects to caravans, portable homes often require
connection to more permanent services.
The Hep2O ® range includes all the necessary items to ensure
compliance with local water byelaws (e.g. double check valves) whilst
allowing the building to be moved to another location when required,
with the minimum disruption to internal systems. Coupled with the ability to
install in difficult spaces and the ability to rotate fittings to allow better
access to valves etc. Hep2O ® is the ideal choice for these structures.
49
Special Applications
Agricultural and Horticultural Use
Because of its resistance to damage, corrosion and cold weather Hep2O ®
has many applications in agricultural and horticultural environments. Typical
installations ideally suited to Hep2O ® are the water supply to milking
parlours, drinking troughs and horticultural watering systems.
Air Conditioning Systems
Hep2O ® is ideal for the condensate pipes from air conditioning systems and
chilling systems, and in many low pressure systems will also be suitable for
the primary circulation. If in doubt contact the Technical Advisory Service –
Tel: 0870 460 5578 Fax: 0870 460 5579 for advice.
Where not to use Hep2O ®
The Hep2O ® system has been designed and tested to meet the
requirements of modern heating and water distribution systems.
Testing has not been carried out to determine suitability for other purposes
and therefore should not be used for instance, in the following
applications:
G
Conveyance of gas.
G
Conveyance of fuel oil.
G
In areas contaminated by petroleum and oil derivatives.
G
Compressed air.
G
Hep2O ® is not suitable for use in systems where the water carried in
the pipe contains a high concentration of chlorine e.g. swimming pools or
decorative water features.
G
Hep2O ® will not be affected by those levels of chlorine expected in UK
water supply (typically less than 0.5ppm). Short term chlorination for
disinfection will not have an adverse effect on the system, (page 47).
G
Hep2O ® should not be used for primary circuit of a Solar Heating
System as temperature cannot be thermostatically controlled. Hep2O ® is
suitable for secondary circulation of these systems.
G
Hep2O ® should be protected at all times from exposure to direct
sunlight and ultra violet light.
G
Hep2O ® should not be installed in Ringmain Installations.
A ringmain is a water-replenished circulating system maintained at a
constant high temperature to provide a permanent source of hot water
to its distributing pipes.
Typical locations where ringmain systems are used are hospitals or hotels
which distribute constant hot water to wards or rooms at a distance
from heat source.
This type of installation is very different from conventional domestic hot
water and central heating services.
This restriction does not apply to domestic systems operating
intermittently at temperatures less than 65°C where a design life of
50 years as detailed in BS 7291 can be expected.
50
Handling and Storage
Hep2O ® is an extremely tough and durable system however, as with all
materials some care is required to ensure damage is not incurred during
storage or installation which may impair its ultimate performance.
Straight lengths of Hep2O ® pipes may be laid flat or stacked vertically. Coils
may be laid on their side or edge. Both are lightweight
and easy to carry and handle.
Pipe and fittings wherever possible should be
stored in their original packaging. This ensures
protection from ultra violet light and will
reduce the risk of contamination.
Spare grab wedges and ‘O’ rings should not be
carried loose amongst other fittings or tools
where they may be damaged. They should be kept
in their original packaging or in a separate container
which will protect them.
Hep2O ® should be protected from contact with petroleum and oil
derivatives.
When carrying or installing Hep2O ® pipe, care should be taken to avoid
dragging the pipe along the ground or damaging the pipe on other surfaces
such as walls.
When feeding pipe through holes in walls and brickwork the pipe end
should be taped over or the red cap included in the pipe coil be used to
prevent damage to the jointing surface and debris entering the pipe.
Care should be taken to avoid kinking the pipe during installation.
Figure No. 67
Hep2O ® Straight Coiled Pipe
11
51
Hints and Tips
For trouble free installation of Hep2O ®
Most installers that have worked extensively with Hep2O ® will have
experienced the odd problem from time to time. Based on customer
feedback and over 20 years experience in dealing with such occurrences, the
following are simple but effective precautionary steps that when taken will
ensure trouble free installation. Potential joint problems can be divided into
two main categories:
Pipe Derived
By far the majority of problems occur because the pipe end inserted into
the fitting has been damaged in some way, this can create a leak pathway via
the scratch or indent for water to pass. This type of damage can occur at
various points along the route to finally commissioning the plumbing system.
But in general taking a few precautionary measures can eradicate any such
problems.
G
Take care in how and where the product is
stored, retain pipe in protective packaging until it
is to be used.
G
Never use an open bladed knife to remove the
pipe packaging.
G
Always use the attached shielded blade tool to
remove packaging and cut on the inside of the
coil, thus enabling the pipe to be contained
within the packaging until the last metre. (Figure
No. 68).
Figure No. 68
G
When threading pipe through holes in stone,
brick and block walls always use a pipe sleeve or
alternatively a small piece of foam pipe insulation
to protect the pipe from the rough surface.
G
Ensure exposed first fix pipework is protected
Figure No. 69
after initial installation if further connections are
to be made to the pipe. By simply pushing a temporary end protector
onto the pipe, it ensures that no debris will enter the pipe and
furthermore it will protect the pipe end from damage. (Figure No. 69).
Fitting Derived
Problems can arise for a number of reasons, grit or debris ingress into the
joint prior to coupling, or sometimes the inadvertent omission of an integral
component part of the joint due to past interference by the installer or a
possible third party. Again taking a few general precautionary measures can
eradicate any such incidents.
G
Store materials in a secure place free from dust and dirt etc.
G
Keep fittings in their bags until ready for use.
G
When fittings are de-mounted ensure they are correctly re-assembled.
G
Do not take joint components from new fittings to replace damaged or
lost components in other fittings.
G
Always follow the do’s and don’t guidelines leaflets included with all bags
of fittings.
52
Fault Finding
Compared with traditional systems the possibility of a fault or leak occurring with
a Hep2O ® system is greatly reduced. However, in the unlikely event of a problem
occurring the following notes will help to identify the cause:
1. Problem: Pipe came out of fitting
Probable Causes:
a. Pipe had not been pushed into socket far enough to properly engage grab
wedge.
Evidence: Lack of teeth marks on pipe or teeth marks only at tips of pipe.
b. Grab wedge has been damaged.
c. The fitting has been dismantled and reassembled incorrectly with the grab
wedge the wrong way round.
Evidence: The teeth of the grab wedge are pointing into the fitting (see pages
42-43 for correct assembly detail).
d. The fitting has been dismantled and reassembled incorrectly with the
components in the wrong order.
Evidence:The ‘O’ ring is next to the cap
(see pages 42-43 for correct assembly detail).
e. The fitting has been dismantled and reassembled incorrectly with the grab
wedge missing.
Evidence: No grab wedge (see pages 42-43 for correct assembly detail).
2. Problem: Joint weeps
Probable Causes:
a. Pipe has been inserted through grab wedge and not through ‘O’ ring.
Evidence: Joint leaks but pipe remains in fitting.
b. Dust or burrs under ‘O’ ring seal (usually occurs if a hacksaw has been used to
cut pipe).
Evidence: Contamination evident on visual examination of components.
c. ‘O’ ring seal has been damaged (usually by insertion of a sharp ended copper
pipe).
Evidence: Damage evident on visual examination of component.
d. Fitting may have been connected to old Imperial copper.
Evidence: Measurement of pipe will reveal discrepancy with current
standard diameter (BS 2871 Part: 1 1971).
e. Components from an old Hep2O ® or Acorn® fitting may have been
used when ressembling a Hep2O ® fitting. The cap, metal grab ring,
‘O’ ring and spacer washer from old Hep2O ® or Acorn® fittings are
not compatible with Hep2O ® fittings.
Evidence: Cap marked HBP (Hep2O ® is marked Hepworth); Metal
grab ring. (Hep2O ® has a white grab wedge); ‘O’ ring not marked (the
Hep2O ® is marked with the size); spacer washer (not needed in
Hep2O ® fitting).
12
53
Fault Finding
3. Problem: Split fittings
Probable Cause:
Formation of ice within a system containing metal pipework, or adjacent
to metal taps.
NB: Water freezes at 0°C and increases in volume until it reaches – 4°C
and 9% volume increase. Hep2O ® pipe can absorb this volume increase
without rupture, but if metal pipe or components are involved in the
system, the extra pressure generated may occasionally be sufficient to split
the fitting.
Evidence: Splitting of fitting or fitting pulled off pipe after severe cold
spell – deformation of grab wedge.
4. Problem: Pipe or fitting melting
Probable Causes:
a. Melting point of polybutylene is approximately 125°C, direct contact
with any naked flame, electric fire, or hot flue pipe, etc., would cause the
pipe to melt.
b. Water/steam within pipe reaches temperatures in excess of normal boiler
safety and malfunction levels. (This is very rare and if found should initiate a
thorough investigation of both heating and electric systems. One cause has
been found to be stray electric current passing through impurities in
water).
Evidence: Visual examination shows material to be deformed. Surface of
material may appear ‘glossy’.
IMPORTANT
If in doubt then return the pipe and the fitting to the Technical Advisory
Department for further analysis.
Note:
Care should be taken not to cause any damage to the sample which may
hinder analysis.
As much of the affected installation should be returned as possible and
sufficient pipe should be left in fittings to allow pressure testing,
(minimum requirement 50mm). If possible a full metre of pipe should be
returned complete with markings or a note made of all pipe markings.
The above notes cover some possible malfunctions generally resulting
from incorrect installation or service conditions. Careful attention to
the notes in this guide will avoid these problems.
54
Information
Advisory Service
Wavin offer a comprehensive range of support services to ensure that any
queries can be dealt with swiftly and efficiently.
Appointments for a demonstration can be made by telephoning Regional
Hotlines.
To obtain guidance on planning installations and to receive immediate advice
of a technical nature telephone the Technical Advisory Service –
Tel: 0870 460 5578 Fax: 0870 460 5579
Literature Service
Hep2O ® is only distributed through builders’ and plumbers’ merchants and
can be obtained nationwide.
For details of your nearest Hep2O ® stockist contact our customer services
team – Tel: 0870 460 5578 Fax: 0870 460 5579
To receive a Product Guide or Consumer Information Leaflet, please ring the
Literature Hotline –
Tel: 01249 766333 Fax: 01249 766332.
Other Sources of Information Literature
The Plumbing Engineering Services Design Guide published by The Institute of
Plumbing.
Building Regulations - Approved Documents A, G and L.
BS 5449: Code of Practice for Central Heating for Domestic Premises.
BS 5955: Part 8: Specification for the installation of themoplastics pipes and
associated fittings for use in domestic hot and cold water services and heating
systems.
BS 6700: Design, Installation, Testing and Maintenance of services supplying
water for domestic use within buildings and their curtilages.
Hep2O ® is manufactured and kitemarked to
Class S of BS 7291, Parts 1 and 2 and is
manufactured within a Quality Management
System which satisfies BSEN ISO9002
requirements.
BS 7291
Hep2O ® Barrier Pipe is Covered by
Agrément Certificate 92/2823 to
class ‘S’ of BS 7291.
The Water Byelaws
Listed in the Water Fittings and
Materials Directory Listing Number 0112066.
D
VE T
A P P RODUC
P RO
This Guide follows requirements stated in
the standards, byelaws and regulations listed
previously. Should it differ from any new UK
or European requirements issued since we
went to print, please obtain clarification by
calling the appropriate Enquiry Hotline.
55
Hotlines
Orders:
Fax 0870 443 8000
(for all orders & additions)
Enquiries:
Tel 0870 443 6000
Technical Advisory Service:
Tel 0870 460 5578
Fax 0870 460 5579
Literature Service:
Tel 01249 766333
Fax 01249 766332
Email:
[email protected]
Web Site:
www.hep2o.co.uk
Wavin
Edlington Lane Edlington Doncaster DN12 1BY UK
Wavin has industrial affiliation with:
Institute of Plumbing
Scottish & Northern Ireland
Plumbing Employers’ Federation
National Association of Plumbing Heating & Mechanical Services Contractors
© Wavin 2009. ® Hep2O is a registered trademark of Wavin. Wavin operates a programme of
continuous improvement, and reserves the right to modify or amend the specification of products
without notice. All information in this publication is believed correct at the time of going to press.
However, no responsibility can be accepted for any errors or omissions.
Printed on paper sourced
from sustainable forests.
2903 – Hep2O IG 08/09
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