TASCO Exit Exam • Set 2 Question 7 of 30

What is the primary function of an Inert Gas System (IGS) aboard crude oil tankers?

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Direct Answer

Option C: Reduce oxygen content in cargo tanks below 8% to prevent explosive vapor-air mixtures

Inert Gas Systems maintain tank atmospheres below 8% oxygen by volume. According to ISGOTT and SOLAS, this oxygen deficit prevents the combustion triangle from forming, eliminating explosion risks during cargo operations.

All Options

Cool liquid cargo during transit

Increase cargo discharge speed

Reduce oxygen content in cargo tanks below 8% to prevent explosive vapor-air mixtures (Correct Answer)

Vent hydrocarbon gas to atmosphere

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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More Questions in TASCO Set 2

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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?