OCTCO/OCTF Exit Exam • Set 2 Question 19 of 30
What is the Lower Explosive Limit (LEL) of typical crude oil hydrocarbon vapors in air?
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Direct Answer
Option C: Approximately 1% by volume
Crude oil hydrocarbon vapors typically exhibit a Lower Explosive Limit of approximately 1% by volume in air. Below this concentration, the mixture is too lean to burn, while exceeding the Upper Explosive Limit makes it too rich.
All Options
A
20%
B
50%
C
Approximately 1% by volume
(Correct Answer)
D
0.01%
Detailed Explanation & Context
Crude oil hydrocarbon vapors typically exhibit a Lower Explosive Limit of approximately 1% by volume in air. Below this concentration, the mixture is too lean to burn, while exceeding the Upper Explosive Limit makes it too rich.
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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