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IS 15051:2001 is the Indian Standard (BIS) for high-pressure fire hose delivery couplings -specification. 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
Defines Storz-type hermaphroditic couplings, which are functionally equivalent but mechanically different from instantaneous couplings.
Key Differences
≠The fundamental coupling mechanism is different across standards; IS 15051 specifies instantaneous (pull-release) couplings, NFPA 1963 is for threaded connections (NST/NH), and DIN standards are for Storz (quarter-turn, hermaphroditic) couplings.
≠IS 15051 specifies a high hydrostatic test pressure of 35 kgf/cm² (34.3 bar), which is significantly higher than the standard 22.5 bar required by BS 336 but lower than the 800 psi (55 bar) required for attack hose couplings by NFPA 1963.
≠While all standards permit copper or aluminum alloys, the specific alloy designations are different and not directly interchangeable (e.g., IS 318 LTB-2 vs. BS EN 1982 CC491K vs. ASTM B62).
≠The standard nominal size in IS 15051 is 63 mm, whereas the direct equivalent in BS 336 is 65 mm (2 ½ inches), reflecting a common difference between Indian metrication and UK imperial-based standards.
Key Similarities
≈All standards aim to provide a secure, reliable, and reasonably leak-proof method for connecting fire hoses under pressure, serving the same fundamental purpose in firefighting operations.
≈Performance testing is a core requirement in all standards, mandating hydrostatic pressure tests for body strength and leakage tests to ensure the integrity of the seal under operational pressures.
≈All standards mandate the use of durable, corrosion-resistant materials, typically specifying classes of gunmetal/bronze (copper alloys) or specific aluminium alloys to ensure longevity in harsh environments.
≈All standards require clear and permanent marking on each coupling, which must include details such as the manufacturer's identification, the standard it conforms to, and often the year of manufacture.
Parameter Comparison
Parameter
IS Value
International
Source
Hydrostatic Strength Test (Body)
35 kgf/cm² (approx. 34.3 bar) for 2.5 min
22.5 bar for 2 min
BS 336:2010
Leakage Test Pressure
22.5 kgf/cm² (approx. 22 bar) for 2.5 min
15 bar
BS 336:2010
Comparison to US Attack Hose Coupling Test
35 kgf/cm² (approx. 34.3 bar)
800 psi (approx. 55 bar)
NFPA 1963, 2019 Ed.
Primary Material (Copper Alloy)
Leaded Tin Bronze, Grade LTB-2 (IS 318)
Copper Alloy CC491K 'Gunmetal' (BS EN 1982)
BS 336:2010
Primary Material (Aluminium Alloy)
Alloy Designation 4225, 4450 or 4600 (IS 617)
Alloy LM25 or LM6 (BS 1490)
BS 336:2010
Standard Nominal Size
63 mm
65 mm (2 ½ in)
BS 336:2010
Washer Material
Natural or synthetic rubber
Natural rubber compound
BS 336:2010
⚠ Verify details from original standards before use
Key Values5
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
Tables & Referenced Sections
Key Tables
Table 1 - Material Requirements for Components of Couplings
Table 2 - Dimensions of 63 mm and 70 mm Size Couplings
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).