Engine : Expired / Engineering Safety - 805/275
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| Pressure-vacuum relief valves, as used on tank vessels, are usually set to operate at two points, __________. |
| A) 14.2 psia; 2 psig |
| B) 26 inches of vacuum; 5 psig |
| C) any two points above atmospheric pressure |
| D) any two points below atmospheric pressure |
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