This standard lays down the requirements for materials, dimensions, construction, and testing of suction hose couplings used for firefighting purposes. It is used by mechanical engineers, fire safety professionals, and manufacturers to ensure that fire pump suction couplings provide a reliable, leak-proof, and airtight connection under both vacuum and pressure conditions.
Specification for Suction Hose Couplings For Fire Fighting Purposes
Quick Reference Values
standard nominal sizes75 mm, 100 mm, and 140 mm
hydraulic test pressure2.1 MN/m² (21 kgf/cm²)
hydraulic test duration2.5 minutes
washer thickness 75mm4.5 mm
washer thickness 100mm 140mm6.5 mm
Practical Notes
Ensure proper matching of threads; suction couplings typically use specific round threads to prevent damage and cross-threading during rapid deployment.
Aluminum alloy couplings must be properly anodized to prevent severe corrosion, especially when stored or used in damp or coastal environments.
Always verify the condition of the rubber washer (conforming to IS 937); a damaged washer will break the vacuum, causing the fire pump to fail to draft water.