What are the standard pressure ratings for IS 15778 pipes?

The standard specifies pipes by Standard Dimension Ratio (SDR), commonly SDR 11 and SDR 13.5, which correspond to different pressure ratings at various temperatures.

What is the maximum operating temperature for these pipes?

The maximum recommended continuous service temperature is 82°C (as per Clause 1.2).

What is the difference between SDR 11 and SDR 13.5 pipes?

SDR 11 pipes have a thicker wall compared to SDR 13.5 for the same outer diameter, giving them a higher pressure rating.

Is this pipe suitable for drinking water?

Yes, the standard is specifically for pipes used in potable (drinking) hot and cold water distribution systems.

IS 15778

: 2023

Chlorinated Polyvinyl Chloride (CPVC) pipes for potable water supply - Specification

CurrentEssentialSpecificationBIMMEP · Water Supply and Plumbing

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This standard specifies the requirements, test methods, and marking for Chlorinated Polyvinyl Chloride (CPVC) pipes intended for hot and cold potable water supplies. It covers material properties, pipe dimensions for different pressure ratings (SDR 11 and SDR 13.5), and physical, mechanical, and thermal characteristics to ensure safety and performance.

Specifies requirements for CPVC pipes suitable for hot and cold potable water distribution systems.

Quick Reference Values

Maximum continuous service temperature82 °C

Minimum Vicat softening temperature115 °C

Standard pipe lengths3 m and 5 m

Opacity requirement (max light transmission)0.2 %

Longitudinal Reversion (max)5 %

Practical Notes

Ensure the correct solvent cement (conforming to ASTM F493) is used for jointing, as generic PVC cement is not suitable for CPVC.

Pay close attention to support spacing requirements, especially for hot water lines, as CPVC has a higher thermal expansion coefficient than metal pipes.

Pipes must be protected from direct sunlight (UV radiation) for outdoor installations, often by painting with a light-colored, water-based paint.