Fires
BLEVEs can be caused by an external fire near the storage vessel causing heating of the contents and pressure build-up. While tanks are often designed to withstand great pressure, constant heating can cause the metal to weaken and eventually fail. If the tank is being heated in an area where there is no liquid, it may rupture faster without the liquid to absorb the heat. Gas containers are usually equipped with relief valves that vent off excess pressure, but the tank can still fail if the pressure is not released at the correct rate. Relief valves are sized to release pressure fast enough to prevent the pressure from increasing beyond the strength of the vessel, but not so fast as to be the cause of an explosion. An appropriately sized relief valve will allow the liquid inside to boil slowly, maintaining a constant pressure in the vessel until all the liquid has boiled and the vessel empties.
If the substance involved is flammable, it is likely that the resulting cloud of the substance will ignite after the BLEVE has occurred, forming a fireball and possibly a fuel-air explosion, also termed a vapor cloud explosion (VCE). If the materials are toxic, a large area will be contaminated.
Read more about this topic: Boiling Liquid Expanding Vapor Explosion
Famous quotes containing the word fires:
“Every year without knowing it I have passed the day
When the last fires will wave to me”
—William Stanley Merwin (b. 1927)
“Put in hours and hours of planning, figure everything down to the last detail, then what? Burglar alarms start going off all over the place for no sensible reason. A gun fires of its own accord and a man is shot. And a broken-down old house no good for anything but chasing kids has to trip over us. Blind accidents. What can you do against blind accidents?”
—Ben Maddow (1909–1992)
“Keep up the fires of thought, and all will go well.”
—Henry David Thoreau (1817–1862)