TASCO Exit Exam • Set 2 Question 10 of 30
What safety device prevents reverse flow of hydrocarbon gas from cargo tanks into the engine room boiler stack?
✓
Direct Answer
Option D: Deck Water Seal and Non-Return Valve
ISGOTT outlines that deck water seals combined with mechanical non-return valves act as absolute non-mechanical and mechanical barriers, stopping toxic hydrocarbon gases from migrating back into machinery spaces.
All Options
A
Flame screen on vent mast
B
High level alarm sensor
C
PV valve
D
Deck Water Seal and Non-Return Valve
(Correct Answer)
Detailed Explanation & Context
ISGOTT outlines that deck water seals combined with mechanical non-return valves act as absolute non-mechanical and mechanical barriers, stopping toxic hydrocarbon gases from migrating back into machinery spaces.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Oil Tanker Cargo Operations (TASCO).
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