USCG USCG General Eng
Set 13 • Question #139 of 498
Launch Interactive Practice Room A centrifugal pump vibrates excessively during operation. Upon disassembling the pump it is found that the impeller is out of balance. Without an available spare, you should __________.
A
drill holes through the heavy side of the impeller until it balances
B
weld counterweights to the light side of the impeller
C
remove metal from the heavy side by machining in a lathe
✓ Correct Answer
D
acid wash and scrape the heavy side until it balances
USCG NMC Regulatory Explanation
In USCG Marine Engineering General Subjects, for engine room systems involving 'A centrifugal pump vibrates excessively during operation. Upon disassembling the pump it is found that the impeller is out of balance. Without an available spare, you should', the standard operating requirement is: 'remove metal from the heavy side by machining in a lathe'.
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