October 2008

Process Developments

Better manage vacuum on gas systems

A systematic approach estimates optimum conditions to prevent air ingress for flares

Datta, K. A., WorleyParsons

Vacuum-breaking is an important issue. Improper design of a vacuum-breaking system may either cause an excessive loss of system gas or a significant loss of vacuum within the system. Such events can cause air ingress and potentially create explosive mixtures. A systematic approach is required when designing a vacuum-breaking system. Heat loss from high-temperature process fluids to the surroundings is inevitable. Calculating heat loss can vary significantly depending on the circumstances. While a steady-state heat loss calculation is simple, calculating heat loss from a static fluid may require rigorous analysis. A common heat loss example is a flare header. The flare system opens to

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