What are the standard capacities for twin CO2 trolley extinguishers?

18 kg (twin 9 kg cylinders) and 45 kg (twin 22.5 kg cylinders) as per Clause 3.

What is the minimum discharge time for a 45 kg unit?

The minimum effective discharge time is 80 seconds, as specified in Table 1.

What types of fire is this extinguisher suitable for?

It is effective on Class B (flammable liquids), Class C (flammable gases), and fires involving live electrical equipment.

How often should the cylinders be hydrostatically tested?

The cylinders must be hydrostatically tested at least once every 5 years, according to the Gas Cylinder Rules referenced via IS 7285.

IS 8149

: 1994

Functional requirements for twin co2 fire extinguishers (trolley mounted)

CurrentSpecializedSpecificationFire Safety · Fire Fighting

Download PDF BIS Portal Google

This standard specifies the functional requirements for trolley-mounted twin carbon dioxide (CO2) fire extinguishers. It covers materials, construction, capacity (18 kg and 45 kg), performance criteria like discharge time and effectiveness, and testing methods to ensure reliability for fighting Class B, C, and electrically started fires.

Functional requirements for twin co2 fire extinguishers (trolley mounted)

Quick Reference Values

Standard Capacities18 kg (twin 9 kg) and 45 kg (twin 22.5 kg)

Minimum Effective Discharge (45 kg model)95%

Minimum Effective Discharge Time (45 kg model)80 seconds

Cylinder Hydrostatic Test Pressure250 kgf/cm² (as per IS 7285)

Hose Assembly Burst PressureNot less than 20 MPa

Practical Notes

Ensure trolley wheels and hose are in good condition for rapid deployment in emergencies.

CO2 displaces oxygen and can cause asphyxiation in confined spaces. Proper training on usage and evacuation is critical.

Regularly check the weight of the extinguisher to ensure it is fully charged; a weight loss of over 10% of the CO2 mass indicates a need for refilling (as per IS 2190).