GASCO Exit Exam • Set 1 Question 5 of 30

What gas is used to inert cargo tanks on gas carriers before introducing gas cargo?

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Direct Answer

Option A: Dry Nitrogen or Inert Gas with low O2

Nitrogen gas or dry inert gas (O2 < 5%) is used to displace oxygen from cargo tanks to prevent flammable atmosphere formation.

All Options

Dry Nitrogen or Inert Gas with low O2 (Correct Answer)

Oxygen

Compressed air

Carbon Dioxide only

Detailed Explanation & Context

Nitrogen gas or dry inert gas (O2 < 5%) is used to displace oxygen from cargo tanks to prevent flammable atmosphere formation.

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

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More Questions in GASCO Set 1

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Q1 What is the primary component of Liquefied Natural Gas (LNG)? Q2 At atmospheric pressure, what is the approximate boiling point of methane? Q3 Which code governs the construction and equipment of ships carrying liquefied gases in bulk? Q4 What is the function of Boil-Off Gas (BOG) on an LNG carrier? Q5 What gas is used to inert cargo tanks on gas carriers before introducing gas cargo? Q6 What is the Maximum Allowable Relief Valve Setting (MARVS) for a Type C independent tank on an LPG carrier? Q7 What risk is associated with rapid liquid cargo release onto steel deck structures? Q8 What type of pumps are most commonly used submerged inside LNG cargo tanks? Q9 What instrument measures low concentration flammable gas by catalytic oxidation? Q10 What safety feature automatically trips cargo valves and pumps during an emergency ESD activation?