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What are the usual pressure and vacuum levels required to activate the P/V valves? |
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MARPOL Annex VI and IMO MSC Circ 585 "Standards for Vapour Emission Control Systems" require that P/V valves in such a system on an oil tanker should relieve the pressure or vacuum once they reach specified levels in a cargo tank: Pressure: 1 psi (0.069 bar) |
