CHEMCO Exit Exam • Set 5 Question 7 of 30
Which action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?
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Direct Answer
Option C: The tank must be vented to the atmosphere.
When a tank is isolated from the inert gas system, it is no longer protected from air ingress. Venting to the atmosphere is necessary to prevent pressure buildup and allow for safe entry or further operations.
All Options
A
The tank must be gas freed.
B
The tank must be ballasted.
C
The tank must be vented to the atmosphere.
(Correct Answer)
D
The bypass valve must also be closed.
Detailed Explanation & Context
When a tank is isolated from the inert gas system, it is no longer protected from air ingress. Venting to the atmosphere is necessary to prevent pressure buildup and allow for safe entry or further operations.
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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