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[WilliamN]

Dear peers,

API 618, Reciprocating compressor, paragraph 6.11.5 Crankcases, has a requirement for relief devices " if specified, the crankcase shall be  provided with relief devices to protect against rapid pressure rise. These devices shall incorporate downward-directed apertures, a flame arresting mechanism, and a rapid closure device to minimize reverse flow".  Normally I put the pressure relief valve on the discharge line for blocked outlet scenario, Appreciate our peers to share your experiences if you have specified a  device based on this paragraph on a crankcase, eg,

 

1 what kind of device did  you specify, eg set pressure above 15 psig or a conservation vent say with set pressure ~ 1psig ( a random low number)?

2 Does the API standard , this paragraph, call for a PSV, or a flame arrester, or a combo?

3 what could cause rapid pressure rise for a crankcase ?

 

etc.

Thanks in advance for sharing  on this subject.