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Recalibration of Safety Relief Valves

Recalibration of Safety Relief Valves

Recalibration of Safety Relief Valves

(OP)
we are building a new chemical plants , we have received and installed the PSVs. Now almost 2 years passed and we did not commission the unit . Do you think I have to bring all the PSVs down for retesting and recalibration or there is no need.
I cannot find any code or std talking about this issue.
what is your opinion and practice.

RE: Recalibration of Safety Relief Valves

Not easy.

How has the plant been left in the intervening period?

This is not usual practice so there will be little telling you what to do, but on the basis that most of your warranties are probably now out of date ( most I know are 12 months in use or 18 months from installation), my advice would be to go back to the end of mechanical completion of the piping etc and start all the pre-comm checks again for everything including the valves.

At telast that way you know where you are starting from in terms of establishing your service and testing intervals and ensuring that the delay has not caused any of the items to seize or become corroded. 24 months sitting there not doing anything might seem like a waste of time, but equally the items were designed to be in operation, no in stores.

Put it this way. Would you be happy to buy a PSV you knew was last tested >24 months ago and since then has been sitting in the open, maybe well sealed, maybe not and then install it without a test?? I wouldn't.

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