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Settle out pressure.

asked Feb 22, 2014 in Process by RichS29
I have been asked to calculate settle out pressure for a compressor system. Would like to know the calculation procedure and the parameter required

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answered Feb 22, 2014 by odadmin (21,030 points)
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When a compressor system trips or shuts down generally a differential pressure drop develops.
which equalizes out, if there is no depressurization (venting) takes place in the system, and arrives at a settle-out pressure.

As per API 521, the minimum design pressure of the separator drum/ scrubber should be calculated as 1.05 times the settle-out pressure. This will provide an adequate differential between the operating pressure and set pressure of the pressure relief device for a compressor shutdown contingency.