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- First Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q516 - Engineering Safety & Environmental Protection
11. Pressure-vacuum relief valves, as used on tank vessels, are usually set to operate at two points, ______.
Pressure-vacuum relief valves on tank vessels operate at 14.2 psia to relieve vacuum and 2 psig to relieve overpressure, ensuring protection against both excessive vacuum and overpressure.
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