What are the standard capacities covered by this IS code?

25, 50, 75, 100 and 150 kg (Clause 4).

What is the hydrostatic test pressure for the extinguisher body?

3.5 MPa (or 35 kgf/cm2), maintained for 2.5 minutes without leakage (Clause 9.2).

What is the minimum discharge time for a 75 kg extinguisher?

35 seconds, as specified in Table 1.

IS 10658

: 1999

Specification for Higher Capacity Dry Powder Fire Extinguisher (Trolley Mounted)

CurrentSpecializedSpecificationFire Safety · Fire Fighting

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This standard specifies the requirements for material, construction, performance, and testing of higher capacity (25 kg to 150 kg) dry chemical powder (DCP) fire extinguishers mounted on trolleys. It covers aspects like cylinder construction, paint finish, expellant charge, discharge fittings, and fire performance ratings for Class A, B, and C fires.

Specification for Higher Capacity Dry Powder Fire Extinguisher (Trolley Mounted)

Quick Reference Values

Minimum Dry Powder Capacity25 kg

Hydrostatic Pressure Test (Body)3.5 MPa

Minimum Effective Discharge (25 kg model)25 s

Minimum Throw Range (25 kg model)6 m

Minimum Fire Rating (25 kg model)20A & 233B

Body Sheet Thickness (welded, 50 kg)3.15 mm

Burst Pressure Test (Body)5.5 MPa

Practical Notes

These extinguishers are intended for large-scale fire risks in industrial and commercial settings and require trained personnel for effective operation.

During inspection, verify compliance with the 'Marking' clause (Clause 10), which requires the BIS certification mark, fire rating, and manufacturing details.

Periodic maintenance, especially checking the weight of the CO2 expellant cartridge, must be performed as per IS 2190 to ensure readiness.