40 CFR Part 61 Subpart V, 61.242-6 - -6 Standards: Open-ended valves or lines.
HandlingregulationOrganisationUS Federal (eCFR)
US federal regulation 40 CFR 61.242-6 requires open-ended valves or lines to be sealed with a cap, blind flange, plug, or second valve except during process flow, specifies closing order for second valves, and sets rules and exemptions for double block and bleed systems and emergency shutdown lines.
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