CHEMCO Exit Exam • Set 3 Question 21 of 30
Which statement about a centrifugal cargo pump is TRUE?
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Direct Answer
Option B: It must have a positive suction.
Centrifugal cargo pumps require a positive suction head to operate efficiently and avoid cavitation. They are not positive displacement pumps, and increasing speed generally increases discharge pressure, not decreases it.
All Options
A
It is a positive displacement pump.
B
It must have a positive suction.
(Correct Answer)
C
Increasing rotation speed will decrease discharge pressure.
Detailed Explanation & Context
Centrifugal cargo pumps require a positive suction head to operate efficiently and avoid cavitation. They are not positive displacement pumps, and increasing speed generally increases discharge pressure, not decreases it.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).
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