What is the standard flushing capacity for a low-level plastic cistern?

The nominal capacity is 10 litres, as specified in Clause 6.1 and Table 1.

What materials are permitted for manufacturing these cisterns?

The cistern body shall be made from high-density polyethylene (HDPE) or other suitable plastic materials that meet the performance requirements of the standard (Clause 4.1).

How is the durability of the flushing mechanism tested?

The flushing mechanism must successfully complete an endurance test of 200,000 operating cycles without any failure (Clause 8.6).

Does this standard apply to concealed cisterns?

This standard primarily covers externally mounted low-level and high-level cisterns. Concealed cisterns are covered by other specific standards like IS 17140.

IS 10150

: 1982

Plastic Cisterns for Water Closets

CurrentFrequently UsedSpecificationBIMMEP · Drainage, Sewerage and Sanitary Fittings

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This standard specifies the requirements for materials, construction, workmanship, dimensions, and performance of plastic flushing cisterns for water closets. It covers low-level and high-level types, including single and dual flush mechanisms, and details the testing procedures to verify their durability and functional efficiency.

Covers requirements for plastic cisterns used with water closets, including material, construction, and functional aspects.

Quick Reference Values

Nominal flushing capacity (low-level)10 litres

Nominal flushing capacity (high-level)12.5 litres

Minimum wall thickness of cistern body3.0 mm

Endurance test cycles for flushing mechanism200,000 cycles

Discharge rate (low-level cistern)Minimum 1.8 litres/second

Leakage test for cistern bodyNo leakage for 2 hours

Ball valve endurance test cycles200,000 cycles

Practical Notes

Always check for the ISI mark on the cistern, which certifies its compliance with this standard's quality and performance requirements.

Ensure compatibility of the cistern's inlet and outlet connections with the specified water supply pipes and WC pans.

Pay attention to the wall thickness and overall construction quality to avoid premature failure or leaks, especially in high-usage areas.