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
Quick Reference Values
hydraulic test pressure2.1 MPa (21 kgf/cm²)
test duration2.5 minutes
standard coupling size63 mm male instantaneous pattern
working pressure0.7 MPa (7 kgf/cm²)
Practical Notes
Fog nozzles are particularly effective for fighting fires in confined spaces or Class B (flammable liquid) fires where a solid stream of water might spread the fuel.
Ensure that the instantaneous connection perfectly matches the standard 63 mm delivery hose couplings as per IS 903.
Always flush the nozzle with clean water after use to prevent the fine apertures from becoming clogged with debris or mineral deposits.