June 2010

Safety/Loss Prevention

Performing correct initial blowdown calculations

These guidelines can help determine peak flowrate

Vyas, A., Sharjah

The primary function of blowdown is to provide equipment with the means to reduce pressure when containment loss is unacceptable. The reduction in pressure compensates for the increase in temperature that takes place during fire conditions such that the coincident pressure and metal temperature do not exceed the allowable stress on equipment and piping. A secondary function of the blowdown system is to reduce local containment loss that arises from leaks that may otherwise lead to escalation and the risk of catastrophic structural failure. A consequence of blowdown is the attaining of low temperature for process fluids and equipment. Consideration must be given to the auto-refrigeration

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