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 codes governing hydrostatic re-test requirements? I'm looking for some guidance on this. Thank you.
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Hydrostatic Re-test Requirement
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