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Scope and Application
This information sheet details requirements for gas safety shut-off systems when connected to fire extinguishing systems.
Acceptable pressure proving safety shut-off systems are available as a package from gas control suppliers or an individually designed system may be installed. Components used in a system must be approved by the Australian Gas Association or acceptable to the Director of Gas Safety.
AS 5601 Gas Installations
Clause 5.11 GAS SHUT OFF WHEN AUTOMATIC FIRE EQUIPMENT OPERATES
Where operation of overhead automatic fire extinguishing equipment may extinguish an appliance flame –
(a) the appliance shall be fitted with a flame safeguard system; or
(b) the installation shall be fitted with a system that will shut off the gas supply when the fire extinguishing system operates. The system shall require pressure proving of the down stream installation prior to the restoration of the gas supply.
To comply with clause 5.11 the safety shut-off system may:
1. automatically shut-off gas supply to an appliance when a fire extinguishing system operates; or
2. automatically shut-off gas supply to the premises or a selected part of the premises such as a commercial kitchen when a fire extinguishing system operates.
The safety shut-off systems design must prevent restoration of supply to unsafe consumer piping.
Clause 6.51 INTERLOCK OF AUTOMATIC FIRE-EXTINGHUISHING EQUIPMENT WITH GAS SUPPLY
Where operation of automatic fire-extinguishing equipment could extinguish a gas appliance flame -
(a) all burners of the gas appliance shall have a flame safeguard system; or
(b) the installation shall be fitted with a system which will shut off the gas supply when the fire extinguishing system operates. the system shall require pressure proving of downstream installation prior to restoration of the gas supply.