What are the standard stiffness classes (SN) for these pipes?

The standard defines three classes: SN 2, SN 4, and SN 8, which correspond to minimum ring stiffness values of 2, 4, and 8 kN/m² respectively (Table 3).

What is the mandatory colour for IS 15328 pipes?

The pipes must be uniformly Golden Brown, corresponding to Shade 414 of IS 5 (Clause 5.1).

Can these pipes be used for drinking water?

No. These are specified for non-pressure underground drainage and sewerage only. For potable water, refer to IS 4985.

What types of joints are used with these pipes?

The standard covers plain-ended pipes for solvent cement jointing and pipes with integral sockets for elastomeric sealing rings (rubber rings) (Clause 6.3).

IS 15328

: 2003

Unplasticized Non-Pressure Polyvinyl Chloride ( PVC -U ) Pipes for use in Underground Drainage and Sewerage Systems

CurrentFrequently UsedSpecificationBIMWater Resources · Plastic Piping System

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This standard specifies the requirements for unplasticized non-pressure PVC (uPVC) pipes used in underground drainage and sewerage systems. It details material composition, dimensions, physical properties like ring stiffness, and testing methods for pipes ranging from 110 mm to 1000 mm nominal diameter. The standard categorizes pipes based on stiffness classes (SN values) to suit different burial and load conditions.

Unplasticized Non-Pressure Polyvinyl Chloride ( PVC -U ) Pipes for use in Underground Drainage and Sewerage Systems

Quick Reference Values

Minimum Ring Stiffness for SN 88 kN/m²

Minimum Vicat Softening Temperature79 °C

Required colour of pipesGolden Brown (Shade 414 of IS 5)

Maximum Reversion5 percent

Standard effective lengths3 m and 6 m

Maximum failure rate in impact strength test at 0°C10%

Practical Notes

The Stiffness Class (SN) is critical. Use SN 4 for light traffic/shallow burial and SN 8 for heavy traffic/deeper burial conditions.

This standard is for non-pressure gravity flow systems only. For pressurized mains, IS 4985 (for water) or IS 14333 (for sewerage) must be used.

The golden brown colour is a mandatory identification feature for pipes conforming to this standard, distinguishing them from potable water (blue) or agricultural (grey/black) pipes.