LGTCO/LGTF Exit Exam • Set 3 Question 14 of 30

List the dryers used with an Inert Gas Generator on gas ships to dry the inert gas generated:

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Direct Answer

Option A: Refrigerated drier and absorption (desiccant) drier

Inert gas generators on gas carriers utilize a two-stage drying plant: a refrigerated dryer to cool gas and condense bulk water (+5°C), followed by an adsorption desiccant dryer (activated alumina) to achieve low dew points (-45°C to -65°C).

All Options

Refrigerated drier and absorption (desiccant) drier (Correct Answer)

Only refrigerated dryer

Only absorption dryer

None of the above; only demister pads are used

Detailed Explanation & Context

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 Liquefied gas tankers are categorized as per the cargoes carried, as follows: Q2 There are three types of gas tankers according to the carriage condition, such as: Q3 The cargo area of a gas tanker which is not equipped in an approved manner to ensure that its atmosphere is at all times maintained in a safe manner is a: Q4 A space other than a gas-dangerous space is known as: Q5 Air intakes for accommodation and engine-room have to be at a minimum safe distance from ventilation outlets from: Q6 Can hot work in dangerous and hazardous areas be carried out during cargo, tank cleaning, gas freeing, purging or inerting operations? Q7 Access from a gas-dangerous zone on the open weather deck to a gas-safe space is arranged through: Q8 Airlock doors should be self-closing and must not have hooks or hold-open devices. There should be a minimum distance of at least _____ between both doors. Q9 An audible and visual alarm system gives a warning on both sides of the airlock when: Q10 The gas-safe and airlock spaces within the cargo area have: