OCTCO/OCTF Exit Exam • Set 2 Question 18 of 30
What parameter must be verified prior to authorizing enclosed space entry for regulatory compliance and STCW code requirements related to Basic Oil & Chemical Tanker?
✓
Direct Answer
Option B: Atmospheric oxygen level at 20.9% and zero toxic/flammable gas concentration
Confined space entry protocols under IMO guidelines demand a verified oxygen concentration of exactly 20.9% by volume alongside zero flammable and toxic gas readings before authorization is granted.
All Options
A
Oxygen level at 15% with ventilation turned off
B
Atmospheric oxygen level at 20.9% and zero toxic/flammable gas concentration
(Correct Answer)
C
Temperature check only
D
Visual inspection through access hatch without gas testing
Detailed Explanation & Context
Confined space entry protocols under IMO guidelines demand a verified oxygen concentration of exactly 20.9% by volume alongside zero flammable and toxic gas readings before authorization is granted.
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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