Engineering · Steam — Safety
On a boiler fitted with a superheater, the superheater safety valve is set to lift:
- AAt a higher pressure than the drum valve
- BBefore (at a lower pressure than) the drum safety valve, to keep steam flowing through and cooling the superheater✓ Correct
- COnly when the boiler is off line
- DAt the same instant as the drum valve
Explanation
The superheater safety valve is set to lift first so steam keeps flowing through the superheater elements when valves relieve; otherwise, with no flow, the superheater tubes could overheat and fail.
Authority: Steam Plants (USCG engineering topic)
Practice the full Engineering bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Engineering questions
- Steam — Safety
A boiler safety valve is set to:
- Steam — Safety
The single most dangerous condition for a fired boiler is:
- Steam — Safety
A water gauge glass on a boiler should be blown down regularly to:
- Diesel — Operating Cycle
In a four-stroke-cycle diesel engine, the events occur in which order?
- Diesel — Operating Cycle
Compared with a four-stroke engine of the same speed and cylinder size, a two-stroke-cycle diesel produces a power stroke:
- Diesel — Air Systems
The primary purpose of scavenging in a two-stroke diesel engine is to: