November 2006

Special Report: Plant Safety and Environment

Calculating settle-out pressure in compressor loops

Simple procedure can be used to help determine piping and equipment design pressures into process loops

Heydari Gorji, A., Kalat Jari, H., Sazeh Consultants

Ehen a compressor compresses gas from one system at P 1 and T 1 to another system at P 2 and T 2 and stops during the maximum pressure drop case, a differential pressure is developed. After a compressor shutdown, the gas is trapped between the upstream and downstream discharge check valve and the pressure is equalized out. This equalized pressure throughout compressor loops is called settle-out pressure. The maximum settle-out pressure is calculated from coincident high-trip pressures on both suction and discharge sides of the compressor. In some situations, a single pressure safety valve is desirable to protect equipment in a process loop. In this regard, and also to estab

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