LGTCO/LGTF Exit Exam • Set 3 Question 21 of 30

What is the operation carried out prior to cooling down the tanks on fully refrigerated liquefied gas carriers?

✓

Direct Answer

Option A: Gassing up

Before cooling down cargo tanks with liquid cargo, tanks must be gassed up with warm cargo vapor to displace inert gas and prevent freezing of CO2 or moisture.

All Options

Gassing up (Correct Answer)

Inerting

Aerating

Gas freeing

Detailed Explanation & Context

Before cooling down cargo tanks with liquid cargo, tanks must be gassed up with warm cargo vapor to displace inert gas and prevent freezing of CO2 or moisture.

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

Practice Full LGTCO/LGTF Set 3

Test yourself with 30 interactive questions, live timer, and instant score.

Launch Practice Simulator →

Question Discussion & Notes

Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.

Loading mariner discussions...

« Previous Question Next Question »

More Questions in LGTCO/LGTF Set 3

View All 30 →

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: