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  1. mrengineer11

    Double Block and Bleed Valve (DBB) Requirement (API, API RP, or other code)?

    In different Oil & Gas companies I have worked, engineers tend to say that any pressure rating from 600# and above, double block and bleed valves are required. Is there any API or similar code or RP that recommends the use of DBB at or above a pressure rating? Is double block and bleed valve...
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