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  1. dacoach

    Proof Pressure. What is it anyway?

    Is Proof Pressure a different test than a hydrostaic or pneumatic test for pressure vessel? What is it governed by with regards to testing requirements? 1.5 X MAWP or is it greater than that? We bought an accumulator last year with the nameplate listing a MAWP of 3000psi and a proof pressure of...

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