How often should a gaseous fire suppression system be inspected?

Weekly and monthly visual checks are required, with comprehensive inspections and tests conducted semi-annually and annually (Clause 5 and Tables 1, 2, 3).

What action is needed if a cylinder's weight loss is over 5%?

The cylinder must be sent for refilling or replaced immediately (Clause 6.3.1).

What is an enclosure integrity test?

It is a test using a 'door fan' to measure an enclosure's leakiness. It predicts if the required agent concentration will be held for the necessary time (typically 10 minutes) after discharge (Annex C).

How often do agent cylinders need hydrostatic testing?

Hydrostatic testing is typically required every 5 years, as per the norms of the Chief Controller of Explosives (CCOE) which this code refers to.

IS 15496

: 2004

Inspection and Maintenance of Gaseous Fire Extinguishing Systems - Code of Practice

CurrentSpecializedCode of PracticeBIMFire Safety · Fire Fighting

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This code of practice specifies the minimum requirements for the routine inspection, testing, and maintenance of fixed gaseous fire extinguishing systems. It covers procedures for CO2, halocarbon, and inert gas systems to ensure their operational readiness and reliability after installation.

Inspection and Maintenance of Gaseous Fire Extinguishing Systems - Code of Practice

Quick Reference Values

Maximum allowable agent weight loss5% of initial weight

Maximum allowable agent pressure loss10% of initial gauge reading (adjusted for temperature)

Cylinder hydrostatic test intervalEvery 5 years (as per CCOE norms)

Enclosure integrity test frequencyAnnually or after changes to the enclosure

Minimum enclosure hold time10 minutes for most applications

Practical Notes

Enclosure integrity is the most critical factor for system success. Annual door fan testing is mandatory to ensure the room can hold the gas concentration for the required duration.

During annual maintenance, always physically check the hydrostatic test date stamped on each cylinder, not just the records.

Ensure that the time delay and pre-discharge alarms are functioning correctly to allow for personnel evacuation, as the gas discharge can be hazardous.