CHEMCO Exit Exam • Set 5 Question 3 of 30
Hydrocarbon gas normally encounted in petroleum tankers cannot burn in an atmosphere containing oxygen less than
✓
Direct Answer
Option B: 11%
Hydrocarbon gases require an oxygen concentration above approximately 11% to sustain combustion. Inerting systems aim to keep oxygen levels well below this critical limit, as per fire safety principles outlined in ISGOTT.
All Options
A
2%
B
11%
(Correct Answer)
C
5%
D
8%
Detailed Explanation & Context
Hydrocarbon gases require an oxygen concentration above approximately 11% to sustain combustion. Inerting systems aim to keep oxygen levels well below this critical limit, as per fire safety principles outlined in 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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