Engineering · Steam — Safety
A boiler safety valve is set to:
- AOpen at a pressure below normal operating pressure
- BLift automatically to relieve pressure above the maximum allowable working pressure✓ Correct
- COpen only when manually operated
- DControl the feedwater level
Explanation
A safety valve is a self-actuating relief device set so it lifts and discharges steam before pressure can exceed the boiler's maximum allowable working pressure, protecting against overpressure.
Authority: Steam Plants (USCG engineering topic)
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