Engineering · Steam — Operations
When raising steam on a cold boiler, the pressure should be brought up slowly mainly to:
- ASave fuel
- BAvoid thermal stress from uneven heating of the boiler metal✓ Correct
- CFill the superheater with water
- DPrevent the safety valve from lifting
Explanation
Heating a cold boiler too fast creates large temperature differences between thick and thin sections, inducing thermal stress and possible cracking. A controlled warm-up keeps the metal evenly heated.
Authority: Steam Plants (USCG engineering topic)
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