PSSR Exit Exam • Set 1 Question 29 of 30
When fuel oil is being topped off during bunkering operations, the tank valve should be closed:
✓
Direct Answer
Option B: 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.
All Options
A
Rapidly to prevent overflow
B
Slowly to prevent surge stresses
(Correct Answer)
C
After the shore pumps are stopped
D
To prevent gas from escaping through the pressure-vacuum relief valves
Detailed Explanation & Context
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.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Personal Safety & Social Responsibilities (PSSR).
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