OCTCO/OCTF Exit Exam • Set 1 Question 7 of 30
What device stops hydrocarbon gas backflowing from cargo tanks into the machinery space?
✓
Direct Answer
Option B: Deck Water Seal and Non-Return Valve
The deck water seal provides a water barrier stopping gas backflow to engine room.
All Options
A
Butterfly valve
B
Deck Water Seal and Non-Return Valve
(Correct Answer)
C
Fan
D
Flame screen
Detailed Explanation & Context
The deck water seal provides a water barrier stopping gas backflow to engine room.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF).
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