CHEMCO Exit Exam • Set 5 Question 21 of 30
Each ship having an inert gas system must have a portable instrument to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure
✓
Direct Answer
Option B: oxygen
Portable instruments for inert gas systems must measure both hydrocarbon vapor and oxygen content. Oxygen measurement is crucial to ensure the atmosphere is sufficiently inert (below 8%) to prevent combustion, as mandated by ISGOTT.
All Options
A
nitrogen
B
oxygen
(Correct Answer)
C
carbon dioxide
D
carbon dioxide
Detailed Explanation & Context
Portable instruments for inert gas systems must measure both hydrocarbon vapor and oxygen content. Oxygen measurement is crucial to ensure the atmosphere is sufficiently inert (below 8%) to prevent combustion, as mandated by ISGOTT.
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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