Gas detection systems are required to detect leaks in many uses and hazardous operations as regulated by BOTH the IBC and IFC. Gas detection systems are required in:
- semiconductor fabrication facilities,
- hydrogen fuel gas rooms,
- refrigerated liquid CO2 beverage dispensing operations,
- extraction facilities using flammable gases,
- areas of storage and use of highly toxic or toxic gases, and
- ozone gas generator rooms
where gas detection is used as an option to ventilation.
Each gas detection system must be designed for use with the specific gas being detected. Secondary power is required unless the gas detection system provides a trouble signal at an approved location upon power loss.
The process of detection is intended to be a continuous, ongoing process. However, for HPM gases, the detection system MUST OBTAIN A SAMPLE AT LEAST EVERY 30 MINUTES.
A sampling interval of 5 minutes is permitted where the gas detection system is provided instead of an exhaust treatment system as allowed for toxic gases in accordance with IFC Section 6004.2.2.7.
The sample is evaluated, and when the gas concentration exceeds 25% of the Lower Explosive Limit (LEL) for flammable gases or 1/2 of the IDLH (immediately dangerous to life and health) for non-flammable gases, the SYSTEM SHALL ACTIVATE A VISIBLE ALARM AND AUDIBLE SIGNAL.