What classes of fire do these portable extinguishers cover?

Depending on the medium, they can cover Class A (solid combustibles), Class B (flammable liquids), Class C (flammable gases), and Class D (combustible metals).

What is the standard operating temperature for portable extinguishers?

Typically -20°C to +55°C, although water-based extinguishers must be protected from freezing conditions.

Is regular hydrostatic testing required for the cylinders?

Yes, extinguisher cylinders must undergo periodic hydrostatic pressure testing to ensure structural integrity and prevent bursting.

IS 951

: 2009

Portable Fire Extinguishers - General Requirements

CurrentFrequently UsedSpecificationBIMFire Safety · Fire Safety

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This standard outlines the general specifications, performance criteria, and construction requirements for portable fire extinguishers. MEP and fire safety engineers use it to ensure that the initial fire suppression equipment procured for buildings and industrial setups is reliable, tested, and structurally sound.

Lays down general requirements for the materials, construction, performance, and testing of various types of portable fire extinguishers.

Quick Reference Values

discharge time8 to 13 seconds minimum (varies by capacity)

operating temperature range-20°C to +55°C (depending on extinguishing medium)

hydrostatic test pressureTypically 3.5 MPa for low-pressure cylinders

burst pressureMinimum 5.5 MPa

Practical Notes

Always cross-reference with IS 2190 for the actual selection, installation, and maintenance guidelines of these extinguishers.

Ensure that the fire extinguisher medium (water, foam, DCP, CO2) is correctly matched to the anticipated fire class hazard (Class A, B, C, or D) of the designated area.