Engineering · Auxiliary — Pumps
A centrifugal pump should normally be primed before starting because it:
- ACannot develop suction lift when full of air✓ Correct
- BWill overspeed if started dry
- CNeeds water to lubricate the motor
- DBuilds too much pressure when primed
Explanation
A centrifugal pump relies on liquid in the casing to create the pressure differential; full of air it cannot prime itself or lift suction, so it must be filled (primed) or have flooded suction.
Authority: Auxiliary Machinery (USCG engineering topic)
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