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PSV Change Over Schedule

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fasco

Petroleum
Joined
May 13, 2013
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QA
Is there a Standard which provides clear guidance on the schedule or cycle of PSV change over from Primary to standby?
 
I am aware of only the IIAR (ammonia industry) standard that provides clear guidance. As I recall, it requires annual or upon a relief incident, whichever comes first. I've never found any other code, rule or standard for any other industry or general use.
 
CGA/ANSI K61.1 also specifies a frequency for relief devices on bulk NH3 pressure vessels that are not part of a refrigeration system.
 
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