10 Water Pex Installation Guidelines -1 4 of 18 Water Pex Piping Systems Installation Guidelines PEX-B is made using a "Silane" or "Moisture Cure" method of cross-linking where links

The Couta Group 117A Miller Street, Epping, VIC 3076 Tel:1300 735 180

Installation Guidelines

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Water Pex™ Piping Systems Installation Guidelines

‘The Couta Group’ Water Pex Piping System Installation Guidelines

This manual contains recommended installation instructions for Water Pex™ piping systems. Failure to

observe these installation instructions may result in substandard performance of the system. The Couta

Group Pty Ltd expressly disclaim any responsibility or liability for substandard performance resulting from

failure to comply with the installation instructions

1. Water Pex™ Pipe Description

The Water Pex™ piping system is available in 2 differing structures. These include:

a. Pex/Al/Pex

This is a five layered macro-composite construction and is the latest innovation for water applications. The

inside layer is made of cross-linked polyethylene (PEX). This is bonded to an overlapped welded aluminium

layer which in turn is bonded to an outside cross-linked polyethylene PEX layer. The middle layer is 100%

oxygen tight and all layers are extruded in one step.

Water Pex™ Pex-Al-Pex pipe combines the benefits of both metal and plastic pipes. The inline welded

aluminium tube is absolutely safe against oxygen penetration. It compensates for the snap-back forces

and the linear expansion caused by temperature changes. The basis of the system is simple, safe and fast

pipe installation: simply bend by hand, cut to length, ream and bevel, join together, crimp, done.

This structure provides the pipe with the advantages of metal and plastic while avoiding their weaknesses,

and brings the following benefits to plumbing –

• it is lower in cost when compared to conventional copper or gal systems

• it is lightweight, bendable and does not need to be welded

• installation times are significantly reduced, saving labour costs

• the product is hygienic, non toxic and smooth

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• low on going maintenance requirements

b. Pex-b Multi-Purpose

The pex-b piping is a lower cost general purpose piping system for water only.

The inner layer of the pipe is constructed from pex-b material. Bonded to the pipe is an outer coloured

layer that provides the product with increased UV resistance making it suitable for external applications.

This piping system is available in a range of colours to make installation quick and easy and comply with

National regulations. The available colours include:

a. Black Multi-purpose water pipe

b. Blue Cold water

c. Red Hot Water

d. Lilac Recycled water

e. Green Rain water

Both systems have been independently tested and certified to demonstrate that they meet the

requirements of the required Australian Standards The systems have also been tested to demonstrate

compliance with AS4020 Testing of products for use in contact with drinking water. In addition the

manufacturing facilities are independently certified to ISO 9001.

c. The Facts – The Differences Between Pe-X A and Pe-X B

In today’s market, there are many misconceptions about the different types of PE-X pipe available. Some

manufacturers will attempt to convince you that their type is the best. But what are the facts?

PE-X pipe is made from High Density Poly-Ethylene (HDPE). PE-X is the short term for Cross-linked (hence,

“X”) Poly-Ethylene (PE). The cross-linking process improves the chemical and temperature performance

ratings of the polymer and provides flexibility and additional strength.

All PE-X is divided into 3 main types: A, B and C. It is a misconception to think that one type is better than

the other simply because it’s an A, B, or C type. These letters are used to identify the manufacturing

process and have nothing to do with quality of performance ratings. All PE-X systems manufactured by

reputable companies are made to meet the same international performance standards. Whether it is

PE-X A, B or C, all products must meet and be certified to the same Australian and International Standards

-AS4176, AS2493 and ISO21003.

PEX-A tubing is produced using the Peroxide (or, “Engel”) method, named after the inventor Tomas Engel.

During the manufacturing process, free radicals are created when HDPE polymer is melted and cross-links

between molecules occur at temperatures that exceed the decomposition temperature of the polymer.

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PEX-B is made using a "Silane" or "Moisture Cure" method of cross-linking where links between the

molecules of the HDPE form after the extrusion process by use of a catalyst and exposure of the pipe to

hot water. This type of PEX is the most common and is manufactured by a large number of companies

including Foshan Rifeng Corporation – the makers of Water Pex.

PEX-C is manufactured using the “Electronic Irradiation” method of cross-linking, also known as "Cold"

cross-linking. Here, cross-linking of the molecules is done after the process of extrusion by exposing the

pipe to an electron radiation beam. The radiation emitted breaks the existing links between molecules of

the polymer and facilitates the cross-linking process.

The most common forms of PE-X used in Australia are PE-X A and PE-X B.

PE-X A has a requirement for the degree of cross linking to be greater than 70% whereas for PE-X B the

requirement is greater than 65%. Why the difference?

The chemical structure of PE-X A has a lower crystallinity due to the manufacturing method. This results in

the piping having a lower density and lower strength and hence PE-X A needs to have a higher degree of

cross linking to meet the required in use performance standards. PE-X B has a molecular structure with a

higher crystallinity. In comparison to PE=X A, this results in PE-X B product having a higher surface

hardness, better scratch resistance, higher thermo stability, higher rigidity, harder body, better resistance

to chlorine solutions and a higher burst strength.

The wall thickness of PE-X A systems is normally greater than PE-X B because it has a lower burst strength

and hence requires the greater thickness to cope with the same operating pressures. As a result of the

thicker wall of PE-X A pipe, it will generally have a lower SDR and hence a lower flow rate. PE-X B has a

superior flow rate in comparison to PE-X A.

Yes PE-X A is more flexible than PE-X B but BOTH types of PE-X have the same minimum bending radius. As

all piping exposed to the sun must be lagged, claims of better UV resistance for PE-X A are irrelevant.

When it all boils down to the bottom line, both PE-X A and PE-X B MUST meet the same minimum

performance requirements as specified in Building Codes and Australian Standards.

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2. System Design and Application Classifications

a. The basic Water Pex™ Pex-Al-Pex and Pex b Multi-Purpose piping system components can be used in

the areas of plumbing, under floor heating & radiator heating.

Materials Applications Service

temperatures

Maximum working

pressure

PEX/AL/PEX

Hot & cold water supply,

under floor heating, radiator

heating etc.

-40º～+95º

PN14 = 14 bar

PEX-B

Hold & cold water supply,

under floor heating, fire

protection, radiation heating

-40º～+90º

16mm - PN16

20mm - PN12.5

25mm - PN12.5

32mm - PN12.5

b. Typical Burst Pressures of Pex-AL-Pex & Pex-b Piping

At 25 Deg C Room temp Pex-AL-Pex:

- 16mm pipe = 7.6 Mpa



At 25 Deg C Room temp Pex b:



c. Minimum distance between pipe fixings

As per AS3500.5:2012 Table 2.14.4, the spacing of brackets for cold and heated water is as follows:

Nominal Pipe Size

DN

Maximum Spacing of Brackets and Clips (m)

Horizontal or

graded pipes Vertical pipes

16 0.60 1.20

20 0.70 1.40

25 0.75 1.50

32 0.85 1.70

40 0.90 1.80

50 1.05 2.1

63 1.10 2.2

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d. SDR Values for Water Pex Pex-b Piping

SDR values are commonly referred to for single layer pex piping systems for water. They are not relevant

for multilayer pex/al/pex piping systems.

The SDR values of Water Pex single layer Pex-b piping is shown in the following table.

DN Size Maximum Outside

Diameter

Minimum Wall

Thickness

Wall Thickness

Tolerance

SDR Value

16mm x 2.0 16.3 2.0 2.0 – 2.3 9

20mm x 2.0 20.3 1.9 1.9 – 2.2 11

25mm x 2.5 25.3 2.3 2.3 – 2.7 11

32mm x 3.0 32.3 2.9 2.9 – 3.3 11

e. R Values of Couta Group Lagged Water Pipe

The R values of the Couta Group Pex/Al/Pex lagged pipe for our pipe is as follows:

Pipe Nominal Size R Value

16mm 1.57

20mm 1.50

25mm 1.44

AS 3500.5 specifies minimum R values for thermal insulation of piping for various regions throughout

Australia. Climate region C covers Victoria and Tasmania and has the highest requirements with a

minimum R rating of 1.0 specified. The R value required in other Australian regions is lower than 1.0

Couta Group lagged water pipe safely complies with R value requirements.

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3. Introduction to Water Pex™ Fittings and Tools

Water Pex is a complete system that has been independently tested for compliance to Australian

Plumbing and Building Codes. The system is comprised of both Water Pex™ pipe & fittings.

The Couta Group provides a wide range of fittings in the Water Pex range to ensure installation is as

simple as possible. Water Pex™ fittings are forged from DR brass to ensure that they are suitable and

approved for use with potable water systems.

The Water Pex fittings have a double o-ring system for added security of jointing as shown below:

A full listing of the fittings range is available at www.waterpex.com.au The list of fittings is regularly

updated so check back periodically to keep up to date with the latest information.

Water Pex Tooling

a. Reamers available

2 styles of reamers are available dependent on user preferences. The reamers perform the function of

rounding the pipe after cutting and beveling the inner lip to allow easy insertion of the fitting for jointing.

Triangular plastic reamers (see below) are frequently used where a small number of joints are needed.

There are 2 sizes of reamer available being GPZ-ZYD16-20 for 16,20,25 mm systems or the

GPZ-ZYD20-32 for 20, 25, 32mm piping.

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In addition, we offer metal reamers for each individual size of pipe (red handle picture below). The

advantage of this style of reamer is that the handle can be removed and the reamer fitted to a drill for

easy operation. This is particularly useful for larger bore pipe to make the job easy, or for smaller bore

pipe where there are many joints to be prepared. Product codes are as follows:

Product Code Product Description

GPZ-JD-1216 Reamer JD-1216




b. Cutting tools available

Designed for smooth, even cutting, the tool's jaw should fit firmly over the pipe to allow a square,

burr-free cut.

Pipe cutter (GPZ-SC1)

Used for cutting Pex Al Pex pipes 16-32mm.

Pipe cutter (GPZ-QGQ)

Used for cutting Pex Al Pex pipes 40-63mm

c. Pipe bending tools available

The Water Pex piping systems may be bent with a maximum bending radius of 5 times the pipe Outside

Diameter (OD). For example, a length of 20mm pipe can have a bending radius of not less than 100mm (5

x 20 = 100) or a 32mm pipe a bending radius of not less than 160mm (5 x 32 = 160).

A range of internal and external bending springs is available. Product codes are listed below:

Product Code Product Description

GPZ-EXSP-16 16mm External Bending Spring




GPZ-WH-1216 16mm Internal Bending Spring




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In addition it is important to note that Copper tube benders may also be used to successfully bend Water

Pex product. For example an 18mm copper bender can be used for 16mm Water Pex pipe, 20mm copper

bender for 20mm Water Pex pipe, etc.

d. Manual Pressing Tools

The Couta Group supplies a range of high quality but inexpensive manual pressing tools for 16 through to

32mm piping systems. The manual pressing tools come in kit form and include all jaws and reamers

required to get the job done.

The GPZ-SYQ14-20A KIT is commonly purchased by installers working on water systems. The kit is shown below

and includes the pressing tool, reamers and heads for connecting 16 and 20mm pipe.

The GPZ-SYQ14-32A KIT has a lengthened handle to make crimping of 32mm joints easier. The kit includes

heads and reamers from 16 through 32mm and is shown below.

Note: All the jaws for the Water Pex Systems are designated “U”-profile. Spare jaws can be purchased for

both tools as required.

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4. Set Up and Operating Instructions for Manual Pressing Tools

Both of the Manual Pressing Tool kits are very similar in set up and operation. Both have individual

pressing jaws for each size of pipe to be crimped. The method of changing jaws is the same on both tools.

In addition both tools need to be calibrated prior to use and calibration is performed by the same method

in both cases.

The lengthened manual pressing tool for sizes 16 through 32mm is shown below. Key part names are

identified as follows:

a. Preparation for use

Choose the correct pressing jaws.

The correct jaws must be chosen for the pipe size to be jointed. For 16mm pipe joint, use the 16mm jaws,

etc.

The jaws are engraved on the face to show the sizing for the pipe outer diameter.

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Mount pressing jaw on to clamp

Open the handles of the pressing tool and undo the Jaw screws (part number 3) so that the jaws can be

inserted into the clamp head.

Position the two jaws in the clamp head ensuring that the two jaws are evenly positioned and the

specification number on each half of the two jaws is facing up. Then retighten the screws to fix the jaw.

It is important to pay attention to the jaw direction ensuring that the centre of the pressing hole

is adjacent to the jaw opening direction

Check the Calibration of the Tool

Try to close the clamp without a fitting or pipe in place. The appropriate Trial-Clamping-Force

required to fully close the clamp jaws should be about 20Kg. This will require firm pressure to

close the jaws and handles fully. If closing the handles requires only light pressure then the clamp

will need adjustment before use, please refer to next step for how to adjust.

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Adjustment of the Crimping Force of the Manual Tool

Open the clamp and loosen the "locking screw"(part No. 1) anti-clockwise for about 3 turns.

If the Trial-Clamping-Force was too loose, you should turn the "calibration screw" (name No. 2) clock-wise

for about 1/4 turn. If the Trial-Clamping-Force is too great, then you should turn the "calibration screw"

anti-clockwise. You should repeat this process until the Trial-Clamping-Force is around 20kg – requires

firm force to close.

Note: The calibration screw should not be touched again when the Trial-Clamping-Force reaches 20Kg,

the clamp should be immediately locked using the locking screw.

Close the clamp and tighten the ‘locking screw’.

With the preliminary adjustment of the tool now complete, it is important to confirm that the crimping is

sufficient by completing a joint using the required sized pipe and fitting and testing with a gauging tool

supplied in the tool kit. The gauging tool is pictured below.

The gauge should slip over the grooves in the sleeve of the crimped fitting without touching the sides. If

the tool scrapes the stainless steel sleeve, needs force, or simply will not go over the crimped sleeve then

the fitting has not been fully crimped. In these cases the tool must be recalibrated and the joint

re-crimped.

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b. Manual Tools – Cautionary Notes for Operation

It is not necessary to use lengthened handles when pressing fittings no bigger than 25mm.Lengthened

handles are necessary for pressing fittings 32mm.

When pressing fittings, the contact points on right and left handles (see main part name No. 10 and 11)

must contact.

Adjustment should be made on following occasions:

o 1st use of the tool

o Every time heads are changed

o Every 60 crimps

o Each day prior to use

o The closed clamp handles can be opened freely with little or no force

The clamp should be maintained periodically by cleaning and adding lubrication oil to pins

(key part No. 3, 5,6,7). As a minimum this should be done once every month.

After adjustment, the nominal operating force applied for crimping the fittings is shown in the following

table:

Specification 16mm 20mm 25mm 32mm

Operation

Force(Kg)

20 32 40 45

5. Installation Procedure for Water Pex™ System

The requirements for the installation of Water systems are mandated by local authorities and AS3500

the Plumbing and Drainage Standard which has been adopted to varying degrees by State Authorities.

AS/NZS 3500 Plumbing and drainage standard is comprised of a number of parts as outlined below:

- 3500.0 Part 0: Glossary of terms (this Standard)

- 3500.1 Part 1: Water services

- 3500.2 Part 2: Sanitary plumbing and drainage systems

- 3500.3 Part 3: Stormwater drainage systems

- 3500.4 Part 4: Heated water services.

- 3500.5 Part 5: Domestic installations

The Standard is primarily intended for the general water industry and for use in the interpretation of

terminology used in the various parts of the Plumbing and drainage series of Standards and covers water

supply from the reticulation main into the premises, including hot water service systems, sanitary

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fixtures, drainage and their associated water and waste fittings, pipe systems and associated

components.

Water Pex systems comply with all requirements of these standards.

It is important for installers of potable water systems to also note that water piping systems (pipe and

fittings jointed) must also comply with AS 4020 - Testing of products for use in contact with drinking

water.

a. Pipe preparation

Cut the pipe to the required length ensuring that the cut is square (perpendicular to the length). Use the

GPZ-SC1 cutter or equivalent for 16 through to 32mm pipe. The GPZ-QGQ cutter is easiest when working

with larger bore piping systems

It is important that you check that the pipe end profile has been cut square as shown below.

b. Rounding and beveling

The reamer tools have the dual purpose of “rounding” the pipe after cutting and then beveling the inner

lip of the pipe to allow easy insertion of the fitting to prevent damage of the o-ring during insertion into

the pipe.

Using either the plastic or metal reamer, insert the correct

sized reamer into the pipe, turning as you go. This will round

the pipe. Push the reamer down and continue to turn so

that the reamer bevels the inner lip of the pipe. You should

see pex swarf being generated at the shoulder of the reamer.

Continue to ream for 3-4 turns.

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It is important that you check that the pipe has been rounded by the

reamer and has been beveled smoothly. Also ensure that the swarf

has been removed from the pipe to ensure that it does not interfere

with crimping of the joint.

c. Creating Pipe Bends

Bending of the pipe may be accomplished by hand, with an internal or external bending spring or copper

tube benders. Bending springs are available within our range of products.

It is very important to note that the minimum bending radius for pipe is 5 x D where D is the nominal

outside diameter of the pipe.

If you want to bend the pipe by hand then this is possible although not the recommended method. A

bending spring is preferred.

If bending the pipe by hand it is recommended that you keep your hands 40cm (16 inches) apart during

the bending process. Create the bend slowly taking care not to kink the pipe or exceed the minimum bend

requirements.

If bending with an internal bending spring, insert the bending spring inside the pipe remembering to leave

a minimum of 2 inches of the spring extruding from the pipe – this is necessary so that you are able to

easily remove the spring after creating the bend. Create the bend ensuring that the bending radius is not

less than 5 x the outer diameter of the pipe. Remove the bending spring when completed.

Where an external bending spring is to be used to create the bend, insert the pipe into the bending spring

and move the spring so that it centres on the point at which you require a bend. Create the bend ensuring

that the bending radius is not less than 5 x the outer diameter of the pipe. Remove the bending spring

when completed.

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d. Connecting Pipe and Fittings – Sizes 16 through 32mm

Check the fitting and pipe - the pipe end should be rounded and beveled as previously described and the

size of the fitting and pipe to be joined must be identical. e.g. 20mm fitting joined to 20mm pipe.

Push the pipe straight on to the fitting (do not “screw/turn” the pipe on to the fitting) until the pipe shows

fully past the witness mark of the sleeve as shown below.

The joint is now prepared for crimping.

Warning: The Couta Group disclaim any responsibility or liability failures due to the use of any

unauthorized tools or mixing and matching the pipe and/or fittings with Couta Group systems.

Ensure that your crimping tool has been adjusted as recommended. Verification/calibration of the tool is

required:

o At the 1st use of the tool

o Every time heads are changed

o Every 60 crimps

o Each day prior to use

o The closed clamp handles can be opened freely with little or no force

IMPORTANT NOTICE:

The Couta Group markets and sells a range of Gas and Water piping systems. Such systems comprise

both pipe and fittings. Our components and systems are certified by SAI Global to the required

Australian Standards required in Australian Building and Plumbing Codes. The certifications apply to

genuine Couta Group products.

The Water Pex piping has not been tested, certified or guaranteed for use in combination with the

product of ANY other company/brand. Similarly for our fittings.

It is CRITICAL that you note that using Water Pex™ pipe or fittings in combination with other

suppliers’ pipe or fittings or use of incorrect tools or other components may cause leakage or other

defects in the system and voids any warranties applicable to the complete Water Pex system. Users

should consult the Couta Group if in doubt as to suitable fittings or tools for any installation.

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Ensure that the correct sized jaw has been fitted to the tool.

Position the jaws so that the face of the jaw abuts the plastic isolating ring as shown below.

Fully close the handles of the crimping tool until the handles lock into their final position. Open the

handles and remove the pressing tool from the fitting. Check the crimp using the gauging tool and if ok

the jointing is complete. The crimped joint will look similar to the following.

The Couta Group has tested and approved the use of Novopress, Klauke, Rothenberger and REMS

battery tools for effective crimping of these larger joints. Jaws are to be U profile. Other brands of

crimping tool have not been fully tested with our systems.

These Installation Guidelines outline common installation situations. If Users meet any new case or have

any questions on the above guidelines, please do not hesitate to contact The Couta Group by phoning

1300 761 916 or via email on [email protected]

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6. Testing and Commissioning of The Installed Water Pex Service

Testing and commissioning of a water service shall be in accordance with Clauses 2.24.2 and 2.24.3 of

AS/NZS 3500.5:2012

After testing has been completed, all fittings should be visually checked for leakage. Results of testing

MUST be recorded on a test report or job sheet. The report must include name of job site and location of

test, date, time, test parameters and testing results. The test report must be attached to the job file for

later reference if required.

Documents

10 Water Pex Installation Guidelines -1 4 of 18 Water Pex Piping Systems Installation Guidelines PEX-B is made using a "Silane" or "Moisture Cure" method of cross-linking where links