OCTCO/OCTF Exit Exam • Set 6 Question 11 of 30
Oxygen deficiency will begin to cause problems to personnel, do you feel to measure the atmosphere before entering clean Tanker?
✓
Direct Answer
Option B: Always necessary for ballast tanks
Atmospheric testing for oxygen (>20.9%), flammable gases (0% LEL), and toxic vapours (0 ppm) is always mandatory before anyone enters any ballast tank or void space.
All Options
A
Not necessary for ballast tanks
B
Always necessary for ballast tanks
(Correct Answer)
C
Not necessary if the tank is filled up twice and discharged at sea
D
Not necessary if the tank is ventilated by external fans
Detailed Explanation & Context
Atmospheric testing for oxygen (>20.9%), flammable gases (0% LEL), and toxic vapours (0 ppm) is always mandatory before anyone enters any ballast tank or void space.
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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