Gas Interlock Systems
What is the purpose of a gas interlock system?
Gas Interlock Systems are safety devices designed to shut off the gas supply to a commercial kitchen if the extraction and airflow systems fail. They will also ensure the gas supply is shut off if the extraction system or air flow rate doesn’t meet minimum standards in the Building & Engineering Services Legislations DW/172 (The Specification of Kitchen Ventilation Systems).
Is it a requirement to install a gas interlock system?
According to the UK’s gas safety regulations and the British Standard BS6173, any food business operating a commercial kitchen must install a gas safety interlock system. Therefore, a gas safety interlock system must be fitted to comply with the law.
How does a gas Interlock system work?
Gas interlock systems monitor the successful extraction of combustion products generated by gas kitchen equipment. This can be achieved in two ways:
- Differential air pressure switch. This monitors the physical flow of air within the canopy area. The controller can be set to different sensitivity levels to achieve a shut-off at the required level of air throughout.
- Current sensor. This device monitors the electrical current drawn by the extraction fan. If the fan is not using enough energy to provide the required extraction rate, the gas supply will be shut off.
What’s the cost of a gas interlock system?
The cost of a gas interlock system can vary depending on the size of the gas pipework supplying your kitchen. However, you can generally expect to pay £2000 – £2500 (ex VAT) to supply and install one.
What components make up a gas interlock system?
A gas interlock system is centred around a control panel with an emergency stop and reset button. This is generally mounted on a wall within your kitchen area. The panel is connected to a solenoid valve in the gas supply pipework, usually installed at the room’s entry point. Depending on the interlock you have installed, the panel will also be wired to either an air pressure switch or an extraction fan power supply. The final component is an emergency stop button; this can turn off the gas supply in an emergency and should be installed close to an exit.
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