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  1. tcbm

    Hydrotest API 598 Trim Valves B31.3

    I have a question I am hoping someone can shore up for me. Under B31.3 is there any way to waive a hydrotest for vessel trim (valve / blind flange) that are attached to vessels. Under B31.3, do we need to hydrotest all valves? The valves themselves were tested to API 598, however they were...

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