OCTCO/OCTF Exit Exam • Set 5 Question 14 of 30
Vapor density of most of the chemical cargoes is?
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Direct Answer
Option B: Heavier than air
Most chemical and hydrocarbon cargo vapours are heavier than air (vapor density > 1.0), causing them to settle and accumulate in low-lying deck areas, scuppers, and bilges.
All Options
A
Lighter than air
B
Heavier than air
(Correct Answer)
C
Same as air density
D
None of these
Detailed Explanation & Context
Most chemical and hydrocarbon cargo vapours are heavier than air (vapor density > 1.0), causing them to settle and accumulate in low-lying deck areas, scuppers, and bilges.
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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