What is the primary function of an IS 952 fog nozzle?

It allows the firefighter to mechanically adjust the water stream from a solid jet (for maximum reach and penetration) to a wide fog pattern (for rapid heat absorption and personnel protection).

What is the hydrostatic test requirement for the fog nozzle?

The completely assembled nozzle must withstand a hydrostatic pressure of 2.1 MPa (21 kgf/cm²) for 2.5 minutes without showing signs of leakage or permanent deformation.

Which standard dictates the dimensions of the coupling attached to the fog nozzle?

IS 903, which covers the specifications for fire hose delivery couplings, branch pipes, nozzles, and spanners.

IS 952

: 2012

Fognozzle for Fire Brigade Use - Specification

CurrentSpecializedSpecificationFire Safety · Fire Fighting

Download PDF BIS Portal Google

This standard specifies the requirements for materials, dimensions, workmanship, and performance tests for fog nozzles used by fire brigades. It ensures the nozzles can reliably deliver both straight jet streams and wide fog patterns under high firefighting pressures without failure.

Fognozzle for Fire Brigade Use - Specification

Quick Reference Values

Hydrostatic test pressure2.1 MPa (21 kgf/cm²)

Minimum working pressure0.7 MPa (7 kgf/cm²)

Hydrostatic test duration2.5 minutes

Practical Notes

Ensure compatibility of the nozzle inlet coupling with standard delivery hose couplings as specified in IS 903.

Aluminum alloy nozzles must be properly anodized or treated to prevent corrosion from prolonged exposure to water and firefighting foam.

Verify the smooth rotation of the spray pattern adjustment mechanism regularly, as it can seize if exposed to grit or poor maintenance.