DuoPEX Water fittings are manufactured from dezincification resistance (DR) brass with a stainless steel crimp ring and joined to the pipe using a specific precision crimping tool.

To increase joint performance all DuoPEX Water crimp fittings are characterised by a plastic holding ring which has three important functions:

1. As a locating ring that matches the DuoPEX Water jaws for a perfect crimp position
2. It allows the installer to visually check when the pipe is correctly fitted on the fitting
3. The fitting has a blue plastic holding ring to identify the fitting is for water installations only

The DuoPEX Gas fittings and DuoPEX Water fittings have different O-Ring compositions that are specific to their purpose.

The yellow holding ring indicates O-Rings for gas and the blue holding rings indicates O-Rings for water. Use the correct fitting for each application. This must be strictly adhered to.

Pipe and fittings are joined and sealed thanks to the stainless steel crimp ring mechanical deformation (2). This deformation is achieved by using the special DuoPEX Gas jaws.

1. Multi-Layer Pipe
2. Stainless Steel Crimp Ring
3. O-Rings
4. Plastic Sight Ring
5. DR Brass Fitting

The Plastic Sight Ring aids in locating the jaws in the correct crimp position and features a witness hole to check the pipe has been fully inserted in the fitting.

Nominal diameter (da x s)	Bending radius (R) without aid	Bending radius (R) with bending spring	Bending radius (R) with bending tool
16 x 2.0	5 x da – 80	3 x da – 48	55
20 x 2.0	5 x da – 100	3 x da – 60	79
26 x 3.0			88
32 x 3.0			128
40 x 3.5			4.0 x da – 160
50 x 4.0			4.0 x da – 200
63 x 4.5			4.5 x da – 252

Note: All measurements in mm unless otherwise stated.

Thermal Changes in Length

Heating and cooling cause pipe length changes. The coefficient of expansion of DuoPEX Water composite pipes is 0.026 mm/m x k. For further information on Linear Expansion Tables and other expansion bend examples contact your DuoPEX representative.

Example Temperature
Differential ΔT	50 k
Pipe length L	5 m
Coefficient of expansion a	0.026 mm/m.K
Linear expansion ΔL	6.5 mm
ΔL	= a x L x ΔT = 0.026mm/m.K x 5 m x 50 K = 6.5 mm

_{Thermal conductivity = 0.45 W/M x K}

Fire and Excessive Heat

• Keep DuoPEX Water pipe a minimum of 500mm from sources of high heat, PEX such as heating appliances and flues from heating appliances
• Keep DuoPEX Water pipe 1500mm from slow combustion type stoves and flues used to heat hot water or cooking (wet back type)
• Leave 300mm minimum space between DuoPEX Water pipe and light fittings or other electrical fixtures
• DuoPEX Water pipe should not be positioned within 150mm of gas or central heating vents or flues
• Where fire collars or the like are required, installers should contact the manufacturer of those products to ensure they have certification for MLP construction

Uncontrolled Heat Sources

In the case of uncontrolled heat sources (e.g. slow combustion stoves, water heating coils, wet back boilers, solar, or similar) DuoPEX Water pipe should not be used. The primary flow and return on these types of heaters should not be installed in DuoPEX Water pipe. Secondary flow and returns must be controlled so that the temperature/pressure requirements are not exceeded.

In the interest of safe temperatures and to protect the user, tempering valves should be installed in accordance with AS/NZS 3500.

When using solar systems, installers should consult with manufacturers to ensure that water leaving the storage facilities does not exceed the performance capabilities of the pipe. Primary flow and returns should not be installed in DuoPEX Water pipe and secondary flow and returns must be controlled.

Temperature/Pressure Requirements

ISO 21003 allows PEX/AL/PEX pipes to be used at 1000kPa at a temperature of 70°C. For applications in excess of 1000kPa, please consult with your DuoPEX representative.

DN	Pipe Dimension	Maximum spacing of fasteners (S)		Pipe weight with water
		Horizontal	Vertical	(kg/m)
12	16 x 2.0	1200	1500	0.225
15	20 x 2.0	1350	1500	0.355
20	26 x 3.0	1500	1750	0.608
25	32 x 3.0	1650	2000	0.935
32	40 x 3.5	2000	2000	1.438
40	50 x 4.0	2500	2500	2.264
54	63 x 4.5	2500	2500	3.611

Note: All measurements in mm unless otherwise stated.

Direct Sunlight Exposure

The outer layer of the DuoPEX Water pipe contains carbon black to the Australian Standard but should not be used in direct sunlight. Lay flat sleeving is available for sizes 32mm to 63mm, however this sleeving has a maximum UV life of 4 years and should be replaced prior to that time. Lay Flat sleeving is available in lilac and green for recycled and rainwater applications, but they do not offer any UV protection. It is best practice to sleeve exposed pipes.

16mm to 26mm pipe is not suitable for exposure to direct sunlight.

Temperature Correction Factor

Temperature	Flow Velocity [V (m/s)]
	0.5	1.0	2.0	3.0	4.0	5.0	6.0
10ºC	1.0	1.0	1.0	1.0	1.0	1.0	1.0
20ºC	0.93	0.94	0.94	0.95	0.95	0.96	0.96
30ºC	0.88	0.89	0.90	0.91	0.92	0.93	0.93
40ºC	0.83	0.84	0.86	0.88	0.89	0.90	0.91
50ºC	0.79	0.81	0.84	0.86	0.87	0.88	0.89
60ºC	0.76	0.78	0.81	0.83	0.85	0.86	0.87
70ºC	0.73	0.76	0.79	0.81	0.83	0.84	0.86
80ºC	0.71	0.73	0.77	0.80	0.82	0.83	0.84
90ºC	0.68	0.71	0.75	0.78	0.80	0.82	0.83

Chemical Resistance

The chemical properties of polyethylene are significantly improved by the cross-linking process.

DuoPEX Water pipes are resistant to the following media:

• Concrete, plaster, mortar, and cement

• Disinfectants and cleaning agents according to DVGW worksheet W 291 and DIN 2000

• All natural potable water constituents

• Corrosion – protection agents according to DIN 1988 Part 4

DuoPEX Water pipes must be protected against:

• Direct contact with bitumen or bitumen strips
• Greases, solvents and oils
• Contaminated areas as defined in AS/NZS 3500

If the DuoPEX Water system is used in areas where, for example, aggressive gases, permanently acting moistures or building materials containing chlorine are to be encountered, the pipe and fittings must be protected using suitable jacketing.

It is also best practice to protect fittings with suitable jacketing when in contact with screed, concrete, mortar or plaster. Always consult the manufacturer for details.

Burial

The DuoPEX Water system can be used below ground in accordance with AS/NZS 3500 Part 1 and Part 4.

It is also best practice to protect pipe and fittings with suitable jacketing when buried in contaminated soil.