September 2014

Process Design

Conduct a design check for depressurization system for cold conditions

Emergency depressurization is a safety provision designed to release gas from a high-pressure system during emergency situations, such as a fire. An overview of cold depressurization is provided, including factors affecting the temperature profiles and critical factors considered while performing the study.

Dole, R., Bhatt, S., Sridhar, S., L&T-Chiyoda Ltd.

Emergency depressurization is a safety provision designed to release gas from a high-pressure (HP) system during emergency situations, such as a fire. Metal wall temperature increases substantially due to flame exposure, which reduces the strength of the metal. This leads to vessel stress rupture, even before the internal pressure increases to its design pressure. With depressurization, the internal stress is reduced, therefore increasing the time to vessel rupture. Depressurization also reduces the stored inventory in the vessel, minimizing the catastrophic effect of vessel rupture and leakage. Although the main intent of depressurization is to protect the vessel during fire, depressurizat

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