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406.8.5 Gas detection system.
Repair garages used for the repair of vehicles fueled by CNG, LNG, or hydrogen, shall be provided with an approved flammable gas-detection system.
406.8.5.1 System design.
The flammable gas-detection system shall be listed or approved and shall be calibrated to the types of fuels or gases used by vehicles to be repaired. The gas detection system shall be designed to activate when the level of flammable gas exceeds 25 percent of the lower flammable limit (LFL). Gas detection shall be provided in lubrication or chassis service pits of repair garages used for repairing nonodorized LNG-fueled vehicles.
406.8.5.1.1 Gas detection system components.
Gas detection system control units shall be listed and labeled in accordance with UL 864 or UL 2017. Gas detectors shall be listed and labeled in accordance with UL 2075 for use with the gases and vapors being detected.
406.8.5.2 Operation.
Activation of the gas detection system shall result in all of the following:
1. Initiation of distinct audible and visual alarm signals in the repair garage.
2. Deactivation of all heating systems located in the repair garage.
3. Activation of the mechanical ventilation and exhaust system, where the system is interlocked with gas detection.
406.8.5.3 Failure of the gas detection system.
Failure of the gas detection system shall result in the deactivation of the heating system, activation of the mechanical ventilation system where the system is interlocked with the gas detection system and cause a trouble signal to sound in an approved location.
406.8.6 Automatic sprinkler system.
A repair garage shall be equipped with an automatic sprinkler system in accordance with Section 903.2.4.2.
406.9 Open Parking Lots.
The provisions of this section shall govern the construction of open parking lots and to all such existing premises hereafter enlarged or changed in location.
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