| 摘要 |
A system for providing differential pressure relief in vessels having a cargo tank, incorporating an inert gas biased pressure/vacuum relief valve is disclosed. A source of inert gas, under controlled pressure and flow rate is connected to a vacuum outlet of a pressure/vacuum valve to bias the valve so that a desired pressure differential across the tank can be maintained during normal operations and easily changed and so that the valve will open at two different desired pressure differentials. A rupture disk connected to the vacuum pump adaptor is set to rupture at a desired pressure differential across the disk to allow atmospheric pressure to reach the vacuum outlet in the event of a rupture. A vacuum pump replaces the rupture disk to maintain a desired pressure differential across the pressure/vacuum valve, so as to reduce the amount of cargo that would leak from the damaged tank.
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