Engineering · Auxiliary — Pumps
A centrifugal pump generally must be primed before starting because it:
- ACannot develop enough head when full of liquid
- BCannot pump air effectively to create suction lift✓ Correct
- CWill overheat if full of liquid
- DRequires air in the casing to seal
Explanation
A centrifugal pump moves liquid by imparting velocity; it cannot create enough suction with air in the casing. The casing and suction line must be primed (filled with liquid) so the pump can draw.
Authority: Auxiliary Machinery (USCG engineering topic)
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