What do the classes of pipe mean?

Class 1 is for cold water supply (up to 27°C at 1.0 MPa). Class 2 is for hot water supply (up to 70°C at 0.6 MPa) and can also be used for cold water (Clause 3.1).

Is this pipe suitable for drinking water?

Yes, the materials must conform to IS 10146, which specifies requirements for safe use in contact with drinking water (Clause 4.1).

How can I identify a pipe conforming to this standard?

The pipe must be marked at intervals of not more than 3m with 'PAP-C', nominal size (e.g., 1216), pipe class, manufacturer's name/trademark, and the ISI Mark (Clause 9.1).

What is the delamination test?

It's a peel strength test (Annex B) to ensure the layers of polyethylene and aluminium are properly bonded and will not separate under stress, which is critical for a composite pipe's integrity.

IS 15450

: 2004

Polyethene/ Aluminium/ Polyethylene Composite Pressure Pipes for Hot and Cold Water Supplies

CurrentSpecializedSpecificationBIMMEP · Plastic Piping System

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This standard specifies the requirements for composite pressure pipes made of inner and outer layers of polyethylene and a welded aluminium core. It covers material properties, dimensions, performance criteria (such as pressure, temperature, and delamination resistance), and marking for pipes intended for hot and cold water supplies within buildings.

Polyethene/ Aluminium/ Polyethylene Composite Pressure Pipes for Hot and Cold Water Supplies

Quick Reference Values

Maximum design pressure for Class 2 pipes0.6 MPa (6 bar) at 70°C

Minimum aluminium thickness for 1216 size pipe0.15 mm

Maximum Ovality (Out-of-Roundness) for size 1216 pipe0.5 mm

Maximum design pressure for Class 1 pipes1.0 MPa (10 bar) at 27°C

Heat Reversion test temperature110 °C

Maximum allowable change in Heat Reversion test3 percent

Practical Notes

The aluminium layer provides rigidity, form-stability (retains shape after bending), and acts as a 100% oxygen barrier, preventing corrosion in connected metallic parts like boilers and radiators.

Ensure fittings (compression or press-fit) are specifically designed for PAP pipes and are from a compatible system, as proprietary differences exist.

Specialized bending tools are recommended to achieve tight radii without kinking the pipe, although gentle bends can be made by hand.