What are the standard nominal sizes available for these pipes?

Nominal sizes range from 40 mm to 200 mm as per Table 1.

What is the minimum required pipe stiffness?

The minimum pipe stiffness is 35 kN/m² when tested according to the method in Annex B (Clause 8.2).

Can these pipes be used for pressurized water supply?

No, this standard is exclusively for non-pressure drainage applications.

What is the requirement for the flattening test?

The pipe must show no evidence of splitting, cracking, or breaking when flattened to 40% of its original outside diameter (Clause 7.3 and Table 4).

IS 9271

: 2004

Unplasticized Polyvinyl Chloride (UPVC) Single Wall Corrugated Pipes for Drainage

CurrentFrequently UsedSpecificationBIMWater Resources · Plastic Piping System

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This standard specifies the requirements for unplasticized polyvinyl chloride (UPVC) single-wall corrugated pipes, both perforated and unperforated, intended for sub-surface and surface drainage systems. It covers material properties, dimensions, physical characteristics, performance requirements like pipe stiffness and impact strength, and methods of test.

Unplasticized Polyvinyl Chloride (UPVC) Single Wall Corrugated Pipes for Drainage

Quick Reference Values

Minimum Vicat softening point79 °C

Minimum pipe stiffness35 kN/m²

Flattening test requirementNo cracking when flattened to 40% of original diameter

Maximum water absorption0.4 mg/cm²

Sulphated ash content for materialNot more than 9 percent by mass

Practical Notes

Ensure pipes are stored away from direct sunlight to prevent UV degradation and potential brittleness over time.

Handle with care during transport and installation, especially in cold weather, as impact strength is significantly reduced at low temperatures.

For perforated pipes used in fine-grained soils, a geotextile wrap is essential to prevent clogging of perforations and the surrounding filter material.