What is the maximum permissible water absorption for stoneware pipes?

6% for pipe thickness up to 20 mm, and 8% for thickness over 20 mm (Clause 7.2).

At what pressure are stoneware pipes hydraulically tested?

They must withstand an internal hydraulic pressure of 0.15 MPa without leakage or sweating (Clause 7.1).

What is the difference between Grade A and Grade AA pipes?

Grade AA pipes have a higher crushing strength requirement and are meant for heavier load applications like deep trenches or traffic zones.

What are the standard lengths of stoneware pipes?

Standard lengths are 600 mm, 750 mm, and 900 mm excluding the socket.

IS 651

: 1992

Salt Glazed Stoneware Pipes and Fittings

CurrentFrequently UsedSpecificationBIMEnvironmental · Drainage, Sewerage and Sanitary Fittings

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This standard provides specifications for the manufacture, dimensions, and testing of salt glazed stoneware pipes and fittings used for underground drainage and sewerage. Engineers use it to ensure proper quality control, hydraulic integrity, and structural strength of gravity sewer lines.

Covers requirements for salt glazed stoneware pipes and fittings primarily used for drainage and sewerage systems.

Quick Reference Values

hydraulic test pressure0.15 MPa

max water absorption thickness upto 20mm6%

max water absorption thickness above 20mm8%

standard pipe lengths600 mm, 750 mm, 900 mm

pipe gradesGrade A and Grade AA

min crushing strength Grade A 150mm dia16 kN/m

min crushing strength Grade AA 150mm dia22 kN/m

Practical Notes

Stoneware pipes are highly corrosion-resistant but brittle; improper bedding or dropping during unloading are the most common causes of failure.

Always specify Grade AA pipes for deep trenches or areas with heavy superimposed traffic loads.

Refer to IS 4127 alongside this code for the correct procedures regarding laying, bedding, and jointing of these pipes.