USCG Exam PracticeBoiler and steam propulsion fundamentals
In a unit feed system under 46 CFR §56.50-30, which statement correctly describes the auxiliary feed pump requirement for a vessel with three boilers?
- A. One auxiliary pump must be dedicated exclusively to each boiler and cannot be interconnected
- B. A single auxiliary pump may serve all three boilers simultaneously without restriction
- ✓ Not more than two boilers may be served by any one auxiliary pump, but the auxiliary pump may be interconnected so any pump can feed any boilerCorrect
- D. Each boiler must have two auxiliary pumps, each capable of 75 percent of normal operating capacity
Why C is correct
46 CFR §56.50-30(e)(1) states that in vessels with three or more boilers using a unit feed system, not more than two boilers may be served by any one auxiliary pump, and the auxiliary pump may be interconnected so that any pump can feed any boiler. The regulation does not require dedicated or dual auxiliary pumps per boiler, nor does it allow one pump to serve all three without restriction. (46 CFR §56.50-30)
Cited:46 CFR §56.50-30