What is the standard working pressure for IS 15051 couplings?

The minimum working pressure is 2.1 MPa (21 kgf/cm²) as per Clause 8.2.

What materials are specified for these couplings?

The primary material specified for the body is Leaded-Tin Bronze (Gunmetal) conforming to Grade LTB 2 of IS 318. Stainless steel is also a permitted alternative (Clause 4 & Table 1).

What is the proof pressure test requirement?

The coupling assembly must withstand a hydrostatic pressure of 3.5 MPa for 2.5 minutes without any leakage or failure (Clause 8.3).

What are the standard sizes available under IS 15051?

The standard covers two nominal sizes: 63 mm and 70 mm (Clause 5).

IS 15051

: 2001

High-Pressure Fire Hose Delivery Couplings -Specification

CurrentSpecializedSpecificationFire Safety · Fire Fighting

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This standard specifies the requirements for materials, dimensions, construction, workmanship, finish, and performance of high-pressure fire hose delivery couplings. It covers couplings of 63 mm and 70 mm nominal sizes, designed for a minimum working pressure of 2.1 MPa for use in high-pressure fire fighting applications.

High-Pressure Fire Hose Delivery Couplings -Specification

Quick Reference Values

Nominal Bore Size63 mm and 70 mm

Minimum Working Pressure2.1 MPa (21 kgf/cm²)

Proof Pressure Test (Hydrostatic)3.5 MPa (35 kgf/cm²) for 2.5 min

Burst Pressure Test (Hydrostatic)5.25 MPa (52.5 kgf/cm²)

Recommended Material (Body)Leaded-Tin Bronze, Grade LTB 2 of IS 318

Practical Notes

These high-pressure couplings are not interchangeable with standard pressure couplings specified in IS 903.

Ensure that the hose and the pump system are also rated for high-pressure service to match these couplings.

Always verify the ISI mark and manufacturer's details on the coupling body to ensure authenticity and compliance as per Clause 9.