Question 29 of 30
When fuel oil is being topped off during bunkering operations, the tank valve should be closed:
A
A) Slowly to prevent surge stresses
B
B) To prevent gas from escaping through the pressure-vacuum relief valves
C
C) After the shore pumps are stopped
D
D) Rapidly to prevent overflow
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Answer & Explanation
The correct answer is Option A: A) Slowly to prevent surge stresses.
Closing valves slowly is critical during the final stages of bunkering to prevent 'surge' or 'water hammer' effects. Rapidly closing valves against high-velocity flow can cause pipe ruptures or mechanical damage due to pressure spikes.