OCTCO/OCTF Exit Exam • Set 1 Question 3 of 30

What operation uses crude oil jets to clean sludges from tank walls during discharge?

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Direct Answer

Option A: Crude Oil Washing (COW)

Crude Oil Washing utilizes high-pressure crude oil jets from dedicated tank-washing machines to dissolve and strip waxy hydrocarbon residues from internal structural members during cargo discharge, minimizing clingage and pollution.

All Options

Crude Oil Washing (COW) (Correct Answer)

Water flushing

Steam cleaning

Solvent soaking

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?