What are the standard sizes for cylindrical suction strainers covered by IS 907?

The standard sizes are 75 mm, 100 mm, and 140 mm.

What is the primary function of these strainers?

They are fitted to the inlet end of a suction hose to prevent leaves, gravel, and other debris from entering the fire pump when drawing water from static sources.

What is the hydraulic testing requirement?

The strainer assembly must withstand a hydrostatic pressure of 1.0 MN/m2 (10 kgf/cm2) for at least 2 minutes without leakage or failure.

IS 907

: 1984

Specification for Suction Strainers, Cylindrical Type For Fire Fighting Purposes

CurrentSpecializedSpecificationFire Safety · Fire Fighting

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This standard specifies the requirements for materials, dimensions, workmanship, and testing of cylindrical suction strainers used in fire fighting. Engineers use this code to procure and inspect strainers attached to suction hoses, which prevent debris from entering and damaging fire pumps during open-water drafting operations.

Specification for Suction Strainers, Cylindrical Type For Fire Fighting Purposes

Quick Reference Values

standard nominal sizes75 mm, 100 mm, and 140 mm

hydraulic test pressure1.0 MN/m2 (10 kgf/cm2)

test duration2 minutes minimum

Practical Notes

Ensure thread compatibility with suction hose couplings specified in IS 902.

Strainers drafting from natural water sources should be inspected regularly for blockages, as clogged strainers lead to pump cavitation.

Aluminum alloy strainers must be treated for corrosion resistance if exposed to harsh or marine environments.