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Pressure in an LPG cylinder is dependant of the ambient temperature and the LPG mix considered. For 70% Propane and 30% Butane at 20 degrees Celsius the pressure is 102 PSI (lb/sq.in.) or 703 KPa.

Please be aware that the pressure inside an LPG vessel will not drop as vapour LPG is being used. LPG cylinder is not to be understood and dealt with as a pressurised gas storage cylinder that will drop in pressure if gas is being taken out of the cylinder.

LPG cylinder contains both liquid and vapour, as vapour is being used at an appliance the liquid vaporises under natural conditions and generates more vapour, hence the efficiency of the LPG storage systems.

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Q: What is the pressure in domestic LPG cylinder?
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