BIGF Exit Exam • Set 7 Question 19 of 30
What does gas free certificate certified for?
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Direct Answer
Option D: 21 percent oxygen by volume
A standard Gas Free Certificate confirms that an enclosed space contains 20.9% to 21% oxygen by volume, 0% LEL of flammable vapors, and safe toxic gas limits.
All Options
A
21 percent nitrogen by volume
B
21 percent carbon dioxide by volume
C
21 percent hydrogen by volume
D
21 percent oxygen by volume
(Correct Answer)
Detailed Explanation & Context
A standard Gas Free Certificate confirms that an enclosed space contains 20.9% to 21% oxygen by volume, 0% LEL of flammable vapors, and safe toxic gas limits.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Basic Training for Ships subject to the IGF Code (BIGF).
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