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  1. Tectch84

    How to determine the Test medium to be used to test and set PSV's.

    I am currently providing third party witnessing at a PSV shop that reconditions and adjust set pressures on PSV's, I am curious to know, how the test medium is determined from Air, Water, Steam. How can i find the specific gravity for say, C4 hydrocarbon or ethelyene or caustic, and how to...

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