What are the different classes of pipes specified in IS 1536?

The standard classifies pipes into Class LA, Class A, and Class B based on their increasing wall thickness and pressure handling capacity.

What is the minimum tensile strength required for these spun iron pipes?

The minimum tensile strength required is 200 MPa as per the mechanical testing requirements.

What code should be used for laying these pipes?

IS 3114 is the code of practice for laying cast iron/spun iron pipes.

IS 1536

: 2001

Ductile Iron Pipes for Water and Sewage

CurrentFrequently UsedSpecificationBIMWater Resources · Drainage, Sewerage and Sanitary Fittings

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This standard specifies the requirements for centrifugally cast (spun) iron pressure pipes used for water, gas, and sewage transmission. It defines the dimensional standards, weight classes (LA, A, B), mechanical properties, and hydrostatic testing procedures to ensure pipeline integrity under pressure.

Specifies requirements for centrifugally cast ductile iron pipes, with or without lining/coating, for water and sewage applications.

Quick Reference Values

nominal diameter range80 mm to 1000 mm

minimum tensile strength200 MPa

maximum brinell hardness230 HB

standard working lengths3m, 4m, 5m, 5.5m

Practical Notes

Always specify the correct pipe class (LA, A, or B) based on the calculated working and surge pressures of the network.

Class LA is generally used for gravity lines and low-pressure transmission, while Classes A and B are for higher pressures.

Ensure the internal lining and external coatings are preserved during transportation and lowering into trenches to prevent premature corrosion.