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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q534 - Engineering Safety & Environmental Protection
9. Which of the following pressures represents the normal pressure setting of a pressure-vacuum relief valve as normally found on tank vessels?
Pressure-vacuum relief valves on tank vessels typically open at approximately +2.0 psi above and -0.5 psi below atmospheric pressure, which corresponds to 16.7 psia and 14.2 psia, respectively.
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