Section 916 Gas Detection Systems
Gas sampling shall be performed continuously. Sample analysis shall be processed immediately after sampling, except as follows:
- For HPM gases, sample analysis shall be performed at intervals not exceeding 30 minutes.
- For toxic gases that are not HPM, sample analysis shall be performed at intervals not exceeding 5 minutes in accordance with Section 6004.2.2.7 of the International Fire Code.
- Where a less frequent or delayed sampling interval is approved.
A gas detection alarm shall be initiated where any sensor detects a concentration of gas exceeding the following thresholds:
- For flammable gases, a gas concentration exceeding 25 percent of the lower flammability limit (LFL).
- For nonflammable gases, a gas concentration exceeding one-half of the IDLH, unless a different threshold is specified by the section of this code requiring a gas detection system.
Upon activation of a gas detection alarm, alarm signals or other required responses shall be as specified by the section of this code requiring a gas detection system. Audible and visible alarm signals associated with a gas detection alarm shall be distinct from fire alarm and carbon monoxide alarm signals.