What is the main difference between Type A and Type B pipes?

Type A pipes have a thinner wall and are for rainwater and ventilation. Type B pipes have a thicker wall and are for carrying soil and waste discharge (Tables 1 & 2).

Can these uPVC pipes be used for hot water drainage?

They can handle intermittent discharge of hot water as they have a minimum Vicat Softening Temperature of 79°C. However, they are not designed for continuous hot water flow (Clause 7.1).

What colour should these drainage pipes be?

The specified colour is grey, with the shade corresponding to No. 631 or 632 of IS 5 (Clause 6.2).

Are these pipes suitable for underground applications?

Yes, Type B pipes are suitable for underground installation for carrying domestic sewerage and waste, provided proper bedding and backfilling procedures are followed.

IS 13592

: 1992

Unplasticized PVC (uPVC) Pipes for Non-Pressure Drainage and Sewerage Systems

CurrentFrequently UsedSpecificationBIMMEP · Drainage, Sewerage and Sanitary Fittings

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This standard lays down the specifications for unplasticized PVC (uPVC) pipes intended for non-pressure drainage and sewerage systems. It categorizes pipes into Type A (for rainwater and ventilation) and Type B (for soil and waste discharge), defining their material composition, dimensions, and performance requirements such as heat resistance and impact strength. The code ensures quality and interchangeability for pipes used in building and civil drainage infrastructure.

Specifies requirements for unplasticized PVC pipes and fittings for non-pressure drainage and sewerage applications.

Quick Reference Values

Minimum Vicat Softening Temperature79 °C

Maximum Longitudinal Reversion5 %

Maximum Light Transmission (Opacity)0.2 %

Maximum True Impact Rate (TIR) at 0°C10 %

Standard Pipe Length4 m or 6 m

Colour of PipeGrey (IS 5 Shade 631 or 632)

Practical Notes

Crucially distinguish between Type A and Type B pipes. Type B pipes have thicker walls and are mandatory for soil and waste lines, while the thinner-walled Type A is only for rainwater or ventilation.

Pipes should be stored away from direct sunlight to prevent UV degradation and loss of ductility over time.

Proper jointing using solvent cement or rubber rings as per manufacturer recommendations is critical to ensure a leak-proof system.