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