OCTCO/OCTF Exit Exam • Set 1 Question 29 of 30

What action is taken if inert gas oxygen content exceeds 8% during cargo discharge?

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Direct Answer

Option B: Stop cargo discharge immediately and rectify IG plant fault

ISGOTT and inert gas system manuals specify that if oxygen content in the inert gas main exceeds 8% during discharge, operations must halt immediately. High oxygen compromises tank tank inertness, increasing explosion risks within flammable vapor zones.

All Options

Open tank lids

Stop cargo discharge immediately and rectify IG plant fault (Correct Answer)

Drain scrubber

Double discharge speed

Detailed Explanation & Context

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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More Questions in OCTCO/OCTF Set 1

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Q1 What MARPOL Annex regulates prevention of oil pollution from tankers? Q2 What is the maximum oxygen content allowed in inert gas supplied to cargo tanks? Q3 What operation uses crude oil jets to clean sludges from tank walls during discharge? Q4 What condition is mandatory before starting Crude Oil Washing (COW)? Q5 What system monitors and controls oily water discharge overboard from slop tanks? Q6 What is the maximum instantaneous rate of oil discharge allowed outside Special Areas under MARPOL Annex I? Q7 What device stops hydrocarbon gas backflowing from cargo tanks into the machinery space? Q8 What instrument measures flammable vapor concentration as a percentage of LEL? Q9 What is Reid Vapor Pressure (RVP)? Q10 What device protects oil cargo tanks against overpressure or vacuum structural damage?