What do the different pressure ratings (PN) for PP-R pipes mean?

PN (Nominal Pressure) indicates the maximum pressure in bars the pipe can withstand with water at 27°C. For example, PN16 is rated for 16 bar at 27°C.

Which PP-R pipe series is for hot water?

Generally, higher pressure classes like PN16 (SDR 7.4) and PN20 (SDR 6) are used for hot water applications to handle the combined effect of temperature and pressure, as per Class 2 of Table 4.

What is the design life of PP-R pipes as per this standard?

The standard is based on a service life of 50 years when operated within the specified temperature and pressure conditions for its class (Annex A).

What is the standard colour for PP-R pipes?

The standard does not specify a mandatory colour, but pipes are commonly available in green or white. The colour should be uniform throughout the pipe wall.

IS 15801

: 2008

Polypropylene-random copolymer pipes for hot and cold water supplies

CurrentFrequently UsedSpecificationBIMMEP · Plastic Piping System

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This standard specifies the requirements for polypropylene-random copolymer (PP-R) pipes used in residential and commercial buildings for hot and cold water distribution systems. It covers material properties, dimensions, pressure ratings, performance requirements, and marking to ensure safety and reliability.

Polypropylene-random copolymer pipes for hot and cold water supplies

Quick Reference Values

Melt Flow Rate (230°C/2.16 kg)0.1 to 1.0 g/10 min

Density0.898 to 0.913 g/cm³

Minimum Required Strength (MRS) ClassMRS 80 (8.0 MPa)

Standard Pressure Nominal (PN) ratingsPN 10, PN 16, PN 20, PN 25

Maximum Service Temperature for Class 270°C

Standard Dimension Ratios (SDR)11, 9, 7.4, 6, 5

Practical Notes

Ensure the correct pipe class (e.g., PN10, PN16, PN20) is selected based on the system's maximum operating temperature and pressure requirements as per Annex A.

Pipes are joined using heat fusion (socket or butt fusion), which requires specialized equipment and trained personnel for a leak-proof joint.

Pipes must be protected from direct sunlight (UV radiation) as PP-R can degrade over time. Use UV-resistant lagging or select carbon black-filled pipes for exposed applications.