<Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> In a refinery or gas plant, LPG must be stored in pressure vessels . These containers are either cylindrical and horizontal or spherical . Typically, these vessels are designed and manufactured according to some code . In the United States, this code is governed by the American Society of Mechanical Engineers (ASME). </P> <P> LPG containers have pressure relief valves, such that when subjected to exterior heating sources, they will vent LPGs to the atmosphere or a flare stack . </P>

Burning of lpg is an example of which process