TASCO Exit Exam • Set 2 Question 11 of 30

What is the purpose of Crude Oil Washing (COW) performed during tanker discharge operations?

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Direct Answer

Option D: Use crude oil spray to wash heavy sludge and paraffin deposits from tank walls and bottom

Crude Oil Washing (COW), mandated by MARPOL Annex I, utilizes high-pressure crude jets to dissolve and strip waxy hydrocarbon residues from structural members, maximizing cargo outturn and sludge prevention.

All Options

Clean cargo piping with chemical solvent

Wash tanks with hot sea water

Cool cargo pumps

Use crude oil spray to wash heavy sludge and paraffin deposits from tank walls and bottom (Correct Answer)

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Oil Tanker Cargo Operations (TASCO).

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Q1 What documented record must be maintained on board following completion of tasks related to regulatory compliance and STCW code requirements in Advanced Oil Tanker Cargo? Q2 What type of personal protective equipment (PPE) is essential when handling emergency procedures and alarm protocols under Advanced Oil Tanker Cargo guidelines? Q3 What parameter must be verified prior to authorizing enclosed space entry for emergency procedures and alarm protocols related to Advanced Oil Tanker Cargo? Q4 What key responsibility belongs to seafarers performing watchkeeping duties for emergency procedures and alarm protocols under Advanced Oil Tanker Cargo? Q5 Which document contains detailed hazard data and emergency handling instructions for substances involved in emergency procedures and alarm protocols during Advanced Oil Tanker Cargo? Q6 Regarding emergency procedures and alarm protocols in Advanced Oil Tanker Cargo, what is the mandatory safety standard required under STCW Code Table A-V/1-1? Q7 What is the primary function of an Inert Gas System (IGS) aboard crude oil tankers? Q8 Under MARPOL Annex I, what is the maximum instantaneous rate of oil discharge allowed from cargo tank areas of oil tankers? Q9 What device measures oxygen concentration continuously in the main inert gas supply line? Q10 What safety device prevents reverse flow of hydrocarbon gas from cargo tanks into the engine room boiler stack?