November 2008

Special Report: Plant Safety and Environment

Determining system depressurizing requirements

Use these guidelines to prevent loss of containment during emergency situations

Vyas, A. A., Petrofac Engineering & Construction

Depressurization is used in the industry to prevent loss of containment during emergency situations; areas of the plant will need to be depressurized from high to near atmospheric pressure. It involves performing elaborate calculations and results in large peak flowrates of flammable material in fire conditions and low temperature due to gas expansion and liquid evaporation in nonfire conditions. Fundamentals of process system sectioning. The basic fundamental for the requirement of blowdown is to reduce the design emergency depressurizing flowrate. Process system sectioning is a philosophy that is applied to split an installation into a number of smaller fire zones. Each zone shall be

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