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OCTCO/OCTF Exit Exam • Set 5 Question 4 of 30

Why are inhibitors added in the cargo?

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Direct Answer

Option B: Inhibitors are added by the Terminal before loading are Toxic. Inhibited cargoes often need oxygen hence should not be carried in inerted tanks.

Certain chemical cargo inhibitors require dissolved oxygen to remain active; carrying these inhibited cargoes under total inerting without proper oxygen levels can cause premature inhibitor failure.

All Options

A
Inhibitors are added by the ship staff before loading are Toxic. Inhibited cargoes often need oxygen hence should be carried in inerted tanks.
B
Inhibitors are added by the Terminal before loading are Toxic. Inhibited cargoes often need oxygen hence should not be carried in inerted tanks. (Correct Answer)
C
Inhibitors that are added by the Terminal before loading are Non-Toxic. Inhibited cargoes do not need oxygen and can be carried in inerted tanks.
D
Once the cargo is inhibited, its temperature is never a concern for cargo carriage

Detailed Explanation & Context

Certain chemical cargo inhibitors require dissolved oxygen to remain active; carrying these inhibited cargoes under total inerting without proper oxygen levels can cause premature inhibitor failure.

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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