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Posted By DANGER RANGER
Can someone describe this process in simple mans English for me because the text book outline just does not sink in. How is explosive pressure formed to an ammount that will rupture a vessel?
Thanks
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Posted By Peter Longworth
Are you talking about BLEVEs or something else.
In a BLEVE (boiling liquid expanding vapour explosion) a vessel containing a flammable liquid is heated by an external heat source (usually a fire). The liquid inside the vesse boils causing an increase in pressure inside the vessel. The action of the liquid boiling cools the vessel but the increase in pressure causes the pressure release valve to release vapour which in turn ignites. The liquid inside the vessel continues to boil but can no longer cool the vessel. The vessel becomes weakened and eventually fails at the point of contact with the heat source causing an explosion with a shock wave which sends metal fragments flying in all directions, or something like that anyway.
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Posted By gham
this can happen with water. (I'm thinking steam pod on steam ovens as an example)
If you have a pressure vessels with a particular liquid (water) capacity and heat it enough to make the liquid (water) enough to make a vapour (water vapour and/or stream) it will create an build up of pressure because the vapour takes up more space that the liquid.
The vessel will be able to contain a certain amount of pressure before a release valve vents off the excess, but say the vent valve gets choked with lime scale for example, the pressure can keep building till the pressure capacity of the vessel is exceeded resulting in an explosive release of the vapour/steam (they go off like a rocket and do much damage). This can happen with most pressurised liquefiable gases, and other gases
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Posted By DANGER RANGER
Thanks folks
It makes text books so much easier to digest when you get a simple description because I now have a simple understanding, I can now look into the more complicated parts with a little insight.
I real life I think I would have just bought the site engineer a pint and tapped him for explanations till he tells me where to go.
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