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The Iplex K2® PE-X Hot and Cold Plumbing system offers an integrated system that is flexible enough to be bent by hand, is extremely light weight corrosion resistant and virtually eliminates water hammer noise. No brazing or soldering is necessary, When installed by a trained and licensed tradesman, the system has proven to be of high quality and economical to use.

How tight can I bend Iplex K2® PE-X pipe?

Due to the pipe’s inherent flexibility and it’s availability in 50 metre and 100 metre coils, PE-X pipe can be bent easily around obstructions or through studs and plates with the minimum use of fittings. Care should be taken not to kink or damage the pipe. It is recommended that the minimum bending radius be 8 times the outside diameter of the pipe. If this is not possible an Iplex K2® elbow should be used. If for any reason the pipe is kinked or damaged, the faulty section should be cut out and replaced.

What needs to be done to install Iplex PE-X K2® in

Timber framework?

Holes drilled in studs or plates etc. shall be accurately sized to allow longitudinal movement of the pipe through the hole with a minimum clearance of 2mm on the pipes diameter. Please note that the use of silicon in the holes is not required.

Metal framework?

Holes drilled in metal studs or plates etc. shall be accurately sized to enable suitable sized grommets, lagging or a short sleeve of oversized pipe to be firmly secured in the framework. This is to allow free movement of the pipe through the grommet, lagging or sleeve without any direct contacts between pipe and framework.

What allowances do I need to make for Thermal expansion?

As the lineal thermal expansion rate of PE-X pipe is approximately 20mm for every 10°C temperature change for each 10 metres of pipe, care must be taken with the installation to allow for this potential movement of the pipe PE-X pipe should not be pulled tight between fixed points as this will prohibit movement if the pipe contracts, and result in excessive tensile forces on joints and fittings. Allow 10mm slack per metre of pipe. Expansion can usually be accommodated by the pipe’s flexibility.

If I am installing Iplex K2® PE-X pipe under concrete slabs, what do I need to do?

PE-X pipe may be installed under concrete slabs in accordance with AS/NZS 3500 parts 1 & 4, or local authority requirements.

When PE-X penetrates the slab it shall be at right angles to the surface of the slab and shall be lagged with an impermeable, flexible plastics material of not less than 6mm thickness for the full depth of the slab penetration i.e. PVC conduit or pressure pipe.

What are the distances between clips used to secure Iplex K2® PE-X pipe?

The use of pipe clips should be in accordance with AS/NZS 3500 parts 1 & 4 and in keeping with good plumbing practice. The following table is based on AS/NZS 3500.

The Use of Pipe Clips
Nom. pipe diameter Horizontal or graded pipes Vertical pipes
16mm 600mm 1200mm
20mm 750mm 1400mm
25mm 750mm 1500mm
Is there a K2® PE-X pipe suitable for recycled water?

Iplex K2® PE-X pipe is available for recycled water. Coloured purple, with the wording “recycled water do not drink” printed along its length.

Can Iplex K2® fittings be used in ground?

Yes, as fittings are DR (dezincification resistant) brass.

What warranty do I receive when I install Iplex K2® PE-X system?

When installed and used correctly for its intended purpose as specified in the Iplex Pipelines K2® PE-X Plumbing System Installation Guidelines, Iplex warrants K2® against manufacturing defects for a period of 25 years from date of manufacture. Refer to the Iplex K2® Warranty Card for specific details (a copy can be downloaded from the Warranty section).

How do I connect Iplex K2® PE-X pipe to a gas or electric hot water system?

When Iplex K2® cross-linked polyethylene pipe is used in a hot water supply system, that installation must conform to AS/NZS 3500 Part 4 and any local by-laws. Particular reference must be made to the pressure and temperature relationship as described in AS/NZS 2492 and as detailed in Table 1 of the Iplex K2® Technical Data and Training manual.

The valves used in the installation of water heaters should comply with the requirements of AS/NZS 3500 Part 4, Tables 5.1 and 5.2

The required set pressure of valves i.e. expansion control valves and inlet pressure control valves shall be:

  • As specified by the water heater manufacturer; or
  • Determined from the set pressure of the temperature and pressure relief valves supplied by the water heater manufacturer, with reference to AS/NZS 3500 Part 4 Table 5.2

The use of tempering valves is required in some capital cities and provincial area. Check with your local authority. Tempering valves should be installed in accordance with AS/NZS 3500 Part 4 and manufacturer’s instructions.

Are there any other requirements for water heater connections?

In accordance with AS 3500 parts 1 & 4, copper pipe must be used within one metre of the outlet of a water heater.

Before connecting PE-X pipe to an instantaneous gas water heater, check with the water heater manufacturer for any specific additional requirements.

PE-X pipe should not be used in continuously circulating hot water plumbing loops above 60°C

How do I connect Iplex K2® PE-X pipe to a solar hot water system?

As solar hot water systems are an uncontrolled heat source, temperature in excess of 75°C are frequently experienced.

To ensure that the supply temperature is maintained well within the normal operating temperatures of PE-X pipe it is recommended that the following typical installation procedure be adopted.

  1. In addition to the normal valves required for the system, an adjustable tempering valve (e.g. TVA50SE or similar) should be installed directly at the solar water heater as per the following diagram.
  2. The tempering valve can then be adjusted to its maximum temperature (up to 65°C depending on model) by following the manufacturer’s instructions. This is typically done by removing the adjusting knob locking device and resetting the temperature.
  3. Individual tempering valves are then fitted as required to control water supply temperature to the wet areas in accordance with AS/NZS 3500 Part 4.2
  4. As per AS/NZS 3500 section 2.4.3, plastic pipe and fittings shall not be used between the isolation valve and the inlet to a water heater or within 1 metre of the outlet of a water heater.
  5. Plastic pipe and fittings shall not be used between a solar collector or other uncontrolled heat source and a heated water container or between an uncontrolled heat source and a heated water tank as per AS/NZS 3500, Section 2.4.3.
Can I use K2® crimp tools to crimp K1® fittings?

Yes tooling is compatible, K2® tools can be used to crimp K1® Gas fittings. Only one set of tools are required to use both systems.

Can I use K2® crimp tools to crimp Pro-fit® Fittings?

The 16mm K2® tool can be used to crimp the 18mm Pro-fit® fittings. The other sizes are not compatible.