VAPOR DEPRESSURING FOR BLEVE PREVENTION
Introduction
Vapor depressuring is a fire protection method used to reduce pressure by voluntary, rapid removal of vapors from pressure vessels in case of fire. This method should be used to reduce pressure in pressure vessels that would be weakened by excessive heating caused by fire or excessive temperature due to exothermic reactions. It may also be used as an operating control during startups, shutdowns, and short-term upsets by reducing pressure to prevent a pressure relief valve discharge. However, vapor depressuring should not be used as a permanent operating control in lieu of correcting the causes of a unit upset. Read more »»