Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — a liquid seal
In USCG Marine Engineering General Subjects, for engine room systems involving 'Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by', the standard operating requirement is: 'a liquid seal'.
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