IS 952:1986 is the Indian Standard (BIS) for fognozzle for fire brigade use - specification. This standard covers the requirements regarding materials, shape, dimensions, workmanship, and performance tests for fog nozzles used by fire brigades. These nozzles are designed to deliver a highly atomized water spray (fog) to rapidly absorb heat, providing a cooling effect and displacing oxygen without excessively disturbing the burning material.
Fognozzle for Fire Brigade Use - Specification
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Inlet Connection Type | 63 mm Instantaneous Male Coupling (as per IS 903) | Threaded (e.g., NST, NPSH) or quarter-turn Storz couplings | NFPA 1964 |
| Hydrostatic Body Test Pressure | 21 kgf/cm² (approx. 20.6 bar / 300 psi) | 3 times rated pressure, but not less than 600 psi (41.4 bar) | NFPA 1964 |
| Rated Operating Pressure | 7 kgf/cm² (approx. 6.9 bar / 100 psi) | 100 psi (6.9 bar) | NFPA 1964 |
| Material Specification (Body) | Prescriptive: Gunmetal (LTB2), Aluminium Alloy (IS 617), or Stainless Steel | Performance-based: Common materials are hard-coat anodized aluminum, brass, or composites meeting specific corrosion/strength tests | NFPA 1964 |
| Minimum Wide Fog Spray Angle | 120 degrees | At least 100 degrees | NFPA 1964 |
| Flow Control Durability Test | Not specified with a cycle count. | Shutoff control must withstand 9,000 cycles of full operation. | NFPA 1964 |
| Corrosion Resistance Test | Not explicitly defined in the same manner. | 240 hours salt spray exposure with specific performance criteria (ASTM B117). | NFPA 1964 |