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LPG Draining, Venting and Purging
Certain repairs will require the draining and purging of the LPG system.
Hazards: Bleeding the system requires isolation of the LPG tank and purging the LPG by means of running the engine until the system switches to the Petrol mode, disconnection of any of the system components will result in a small amount of LPG being released into the atmosphere.
Draining of the system should be done by extraction using a LPG recovery and transfer pumping equipment only. This type of apparatus is commercially available but if you require further information please consult your Local Authority for guidance.
Safety measures: Bleeding operations should be only done in a designated ventilated area.
The manufacturers safe working instructions for the pumping equipment must be followed at all times.
Ensure the LPG is placed into suitable storage containers.
When purging the system or tank, ensure after draining the system is drawn down to a negative pressure prior to the dried compressed air being introduced. Failure to draw down the system will result in the release of residual LPG vapours.
Ensure only qualified technicians work on this equipment, they will have to be trained on correct isolation, draining and removal procedures for fuel tanks and leak detection.
Ensure that vehicle repairs are carried out in areas with good ventilation.
When tasks have to be undertaken in a confined space, a second safety person should be present. They must observe the technician working within the confined space from outside that area.
Ensure that the LPG tanks do not become heated by prohibiting any welding or heat related repair processes near it, Under no circumstances should a vehicle be placed in a spray / baking booth and baked as part of a paint process. When these types of repair are necessary the LPG system requires purging and draining before removing the tank from the vehicle. Removed tanks should not be left exposed to direct sunlight for long periods. This is the same affect as baking in a paint booth.
Storage of LPG tanks removed from the vehicle must conform to the highly flammable liquids and liquefied petroleum gases regulations 1972 and the pressure systems and transportable gas containers regulations 1996.
The local authority should be consulted regarding the siting of the storage area. Alternatively the LPG gas association code of practice 7, storage of full and empty LPG cylinders and cartridges, provides a concise set of guidelines recommended by the HSE for use.
For further information please consult our Dual Fuel Vehicles / Safety Manual reference VA0001986 published in August 2000
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