LGTCO/LGTF Exit Exam • Set 6 Question 18 of 30

What is the role of purge gas in liquefied gas cargo handling?

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Direct Answer

Option D: used to change the atmosphere in a line or tank safely

Purge gas (such as nitrogen or inert gas) is utilized to safely displace atmospheric air or hydrocarbon vapours to avoid flammable mixtures.

All Options

to prepare lifeboat provisions

to reduce navigation watch requirements

to replace fire detection systems

used to change the atmosphere in a line or tank safely (Correct Answer)

Detailed Explanation & Context

Purge gas (such as nitrogen or inert gas) is utilized to safely displace atmospheric air or hydrocarbon vapours to avoid flammable mixtures.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).

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Q1 Running two identical centrifugal cargo pumps in parallel will result in: Q2 Whether cargo tanks are of Type 'A', 'B' or 'C', a complete double hull is required for carriage of liquefied gas cargoes below what temperature? Q3 What is the minimum water application rate of the fixed water spray system for fire protection purposes on horizontal deck surfaces? Q4 What is the minimum water application rate of the fixed water spray system for fire protection purposes on vertical surfaces? Q5 In fixed gas-detection systems on board gas carriers, the Gas Codes mandate that sampling intervals from any one space must not exceed: Q6 What is the name of the statutory certificate issued by a Flag Administration confirming that a gas carrier complies with the IGC/GC Gas Code? Q7 Which space is defined as the space enclosed by the ship's structure in which a cargo containment system is situated? Q8 Which petroleum gases does commercial LPG mainly consist of? Q9 What is the primary purpose of inerting on a liquefied gas carrier? Q10 What is the function of membrane tank on a liquefied gas carrier?