Concerns about LPG Powered Cars in Enclosed Car Parks
January 23, 2009
LPG (under a variety of names “GPL” and “Auto gas” also) is widely used as a vehicle fuel in Far East, USA, Europe. USA, UK, Holland, Italy and France have particularly well developed infrastructures.
There are serious restrictions on LPG fuelled vehicles using ferries, tunnels, enclosed car parks. They do check and they turn back vehicles simply when found. All underground car parks in Europe and in the USA have signs banning for LPG powered vehicles.
Since 2001, LPG tanks and fuel systems are fitted with active safety mechanisms that better minimize the risk of explosion or leakage, making it safe to park vehicles also in multi-story and underground car parks. The Italy Interior Ministry allows all LPG vehicles with a safety system that complies to the ECE/ONU no. 67/01 Regulation to park on the first underground floor of multi-story car parks, even when connected to other underground floors.
LPG is pressurized and LPG tanks are sealed. Sealed tanks eliminate evaporative emissions or spillage. Using outage valves incorrectly during refueling, however, could cause excess vapor discharge.
The weight of LPG vapors at ambient temperatures is approximately 150 % the weight of air. If there is a leak, LPG vapors tend to sink to the ground and pool, creating a potentially hazardous situation. In some areas in North America, LPG vehicles are not allowed in enclosed car parks, tunnels. LPG is extremely volatile and burns twice as hot as a gasoline fire. Vehicle fuel tanks in LPG vehicles are of relatively thick-wall steel construction. In the event of a vehicle crash, they are much less prone to rupture or to cause fires than gasoline tanks.
LPG can explode when mixed with air in the range 1.8 % to 8.6 %. It requires a small ignition source, which could be a match, cigarette, electrical spark (think overhead catenary) or even a simple sharp strike against certain materials, particularly metals containing aluminum, magnesium, titanium etc.
You can smell a leak of LPG, but you have nowhere to go to escape in such place. LPG gas sinks so its difficult for the ventilation system to extract it. Spilt petrol falls to the ground, but then it evaporates. Auto gas is more explosive than petrol.
LPG is stored in a closed high pressure system so any breach will leak gas or liquid that rapidly gasifies leading to an air/gas mixture of potentially the correct proportions. Once ignited the explosion is highly likely to lead to fire and subsequent possible death by carbon monoxide poisoning as well as fire and shrapnel injuries.
Federal Council of Switzerland has officially banned LPG powered vehicles from multi-storey car parks! An appropriate sign was developed, but it cannot be used in German-speaking Switzerland because nobody understands the meaning of the French abbreviation GPL. Authorities has written to the Council to launch a debate on both a Switzerland-wide ban and an appropriate sign that can be understood throughout Switzerland, or even throughout Europe. The rules in force do not prohibit the imposition of individual bans. The owner or the management of a multi-storey car parks have the right to ban access to vehicles of this type by putting up an appropriate sign, and naturally such an arrangement would apply to foreign vehicles too.
In case of basement fires offer a degree of complexity and hazard beyond the normal building fire due to heat build up and the need for firefighting access being made from above. Enclosed car fires can develop to create an extreme heat and smoke environment, possibly compromising the structure. This may have a direct impact on not only occupants but also firefighter safety, especially in relation to search and rescue.
Insurance Companies in Europe and USA have continued the risk analysis and made recommendations on the construction, equipment and other safety measures of multi-storey enclosed car parks.
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