What is the primary function of a suction wrench?

It is used by fire personnel to securely tighten or loosen standard suction hose couplings to fire pump inlets to ensure an airtight seal for drafting water.

What materials are allowed for suction wrenches?

Typically manufactured from light but strong materials like aluminum alloy or galvanized iron/steel to balance durability with portability.

Are the wrenches universal for all hoses?

No, they are dimensionally matched to standard suction coupling sizes, commonly 100 mm and 140 mm.

IS 4643

: 1984

Specification for suction wrenches for fire brigade use

CurrentSpecializedSpecificationFire Safety · Fire Fighting

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This standard specifies the requirements for materials, shape, dimensions, and finish of suction wrenches used by fire brigades for tightening and loosening suction hose couplings.

Specification for suction wrenches for fire brigade use

Quick Reference Values

standard coupling nominal sizes100 mm and 140 mm

Practical Notes

Wrenches made of aluminum alloy should be frequently inspected for stress fractures or deformation due to repeated high-torque application.

Ensure the wrench lug profile matches standard suction couplings to prevent slipping and stripping the coupling lugs during emergency drafting operations.