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[TCKline]

First time poster.  I'm an ME that's been in the chemical industry for 18 years, involved in project management, maintenance, mechanical integrity, reliability, etc. 

 

My question is does a relief valve replacement frequency include the time that the replacement valve is in stores, sitting on a shelf, tested and certified?  In other words, is the replacement frequency from the time it is repaired/tested until it is taken out of service, or is it only the time that it is actually installed in service? 

 

Thanks,

Todd

[latexman]

It is a time in service.  For example, we have a lot of PSV's on a yearly schedule.  After about 1 year the in-service PSV is taken out, cleaned, inspected, refurbished, tested and put on the shelf.  The spare PSV is put in service, where it should be for about 1 year until the process is repeated.