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What are the usual pressure and vacuum levels required to activate the P/V valves?

05 Nov '19, 14:14

Nov. 5, 2019, 2:14 p.m.
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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)
Vacuum: 0.5 psi (0.034 bar)

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05 Nov '19, 14:18

Nov. 5, 2019, 2:18 p.m.
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