A.4c.1 - PSV installed.A.4c.2 - Each input source has PSV set no higher than MAWP of the vessel & a PSV is installed on vessel for fire exposure & thermal expansion.A.4c.3 - Each input source has PSV set no higher than the vessel’s MAWP, at least one of these PSV’s can’t be isolated from the vessel.A.4c.4 - PSVs on downstream equip can satisfy relief requirements of vessel & can’t be isolated from the vessel.A.4c.5 - Vessel is final scrubber in a flare, relief, or vent system, is designed for max. built-up back pressure & has no internal/external obstructions such asmist extractors or back-press. valves.A.4c.6 - Vessel is final scrubber in a flare, relief, or vent system, is designed for max. built-up back-pressure & has rupture disk (PSE) to bypass internal/external obstructions such as mist extractors or back-press. valves

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