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  1. MPD

    Hydrostatic Re-test Requirement

    We are using pressure vessels with nitrogen gas to 1000 psig. The design limit is 5,000 psig. The vessel was originally proof tested hydrostatically to 2,000 (cycled 1,000 times), then the pressure was increased until it failed at 8,000 psig. This was in 1971. What are the current applicable...

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