USCG Exam PracticeBoiler and steam propulsion fundamentals
Under 46 CFR §63.20-1, following an emergency safety trip of an automatic auxiliary boiler, what is the required procedure for postpurge of the boiler air flow?
- A. Postpurge must be accomplished automatically by the control system before restart is permitted
- B. Air flow must automatically increase to maximum to clear the furnace, then reset
- ✓ Postpurge must be accomplished manually; air flow must not automatically increase after the tripCorrect
- D. Postpurge is not required if the low fire interlock is engaged
Why C is correct
46 CFR §63.20-1(a) states that following emergency safety trip control operation, the air flow to the boiler must not automatically increase, and postpurge must be accomplished manually. This prevents an automatic air increase from dispersing unburned fuel into the furnace in an uncontrolled manner.
Cited:46 CFR §63.20-1