What types of fires are CO2 extinguishers used for?

They are primarily used for Class B (flammable liquids) and electrical fires, as CO2 is non-conductive and leaves no residue.

What are the standard capacities for portable CO2 extinguishers?

The standard capacities are 2 kg, 3 kg, and 4.5 kg.

How is a CO2 extinguisher checked during routine maintenance?

By weighing the cylinder. It must be sent for recharging if the loss in mass is more than 10 percent of the original charge.

What is the required hydraulic test pressure for the cylinder?

The cylinder must withstand a hydraulic test pressure of 25 MPa (250 kgf/cm2).

IS 2878

: 2004

Fire Extinguisher, Carbon Dioxide Type (Portable and Trolley Mounted) -Specification

CurrentFrequently UsedSpecificationBIMFire Safety · Fire Fighting

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This standard covers the principal requirements, materials, shape, construction, and performance test criteria for portable and trolley-mounted carbon dioxide fire extinguishers. CO2 extinguishers are primarily designed for tackling Class B (flammable liquid) and Class C (electrical) fires without leaving residue.

Fire Extinguisher, Carbon Dioxide Type (Portable and Trolley Mounted) -Specification

Quick Reference Values

portable capacities2 kg, 3 kg, 4.5 kg

trolley mounted capacities6.5 kg, 9 kg, 22.5 kg

hydraulic test pressure25 MPa (250 kgf/cm2)

minimum effective discharge95 percent

discharge time 4 5kg10 to 24 seconds

Practical Notes

CO2 extinguishers do not use pressure gauges; their operational readiness must be verified by weighing. If the loss in mass exceeds 10%, the extinguisher must be recharged.

Users must be cautious to hold only the insulated handle or horn during discharge, as the rapid expansion of CO2 gas can cause the metallic parts to become extremely cold and cause frostbite.

Portable CO2 fire extinguisher specifications have largely been superseded by IS 15683, but IS 2878 remains highly relevant for legacy installations and trolley-mounted units.