We have to provide LPG leak detectors on the parking area to detect the LPG leakage from the vehicle.
If the detectors activated , the ventilation should stop or not.
Because of the relatively high density of the gas from LPG, the most important factor for its removal is having highly effective ventilation in place for the space near the floor of the car park. Consequently, this requires consideration of the design of such systems. I am unaware of installation standards that require this, therefore this could be a local building safety regulation. Since I may have missed something, maybe someone could quote a regulation.
However in terms of engineering a ventilation system, this known material fact should be taken into account for designing building safety systems. To me, the ventilation should be continuously provided in car parks and not activated by the leak detection system. The leak detection system should provided for notification when concentration of the LPG is at a dangerous flammable levels and for the monitoring ventilation systems.
I would certainly want to consult with someone in the design of the ventilation system if you anticipate ventilating LP gas through it. LP gas is ignitable at just 2% in air, but as Milton points out it's heavier than air so the system design may already reduce the potential for drawing the gas into the system? What is the likelihood of the ventilation system being intrinsically safe or explosion proof over the life of the system?
One of the key points with an LP gas release emergency is controlling ignition sources so typically the an alarm or sensor will activate at 5% of the lower explosive limit, which at that point offers what appears to be a "large safety cushion" but, it is important to recognize that if a leak occurs and is ongoing when the gas is detected somewhere between the container and the activated detector is a concentration of the gas within its flammable range (generally considered to be between 2% and 10% in air). At the point of the leak before it mixes with air it's 100% gas (too rich to burn) and where it's detected it's 5% of the LEL (too lean to burn ) somewhere between the gas is ready for ignition and looking for that spark.
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