Who needs the STCW advanced liquefied gas tanker certificate?

STCW Regulation V/1-2 requires masters, chief engineer officers, chief mates, second engineer officers and any person with immediate responsibility for loading, discharging, care in transit or cargo equipment on liquefied gas tankers to hold the advanced certificate.

What are the prerequisites for the advanced gas tanker course?

Candidates must first complete basic training for gas tanker cargo operations and then have either at least three months of approved seagoing service on gas tankers, or at least one month of approved onboard training including a minimum of three loadings and three unloadings.

Is the end-of-course exam multiple choice?

The course (about five days, following IMO Model Course 1.05) ends in a written assessment that is commonly multiple choice. The exact number of questions and pass mark are set by the flag-state-approved training centre rather than fixed by STCW.

What does the IGC Code filling limit protect against?

The filling/loading limit (generally FL 98% at the reference temperature) ensures a cargo tank cannot become liquid-full as the cargo warms and expands. A liquid-full tank has no vapour space to absorb expansion and could be hydraulically over-pressurised.

Why is LNG tank cool-down controlled to about 10 C per hour?

Rapid temperature change induces high thermal stress in thin membranes and insulation. Cool-down is performed by spraying small controlled amounts of LNG and is limited (commonly to about 10 C per hour) to prevent cracking and containment damage.

How is boil-off gas managed on an LNG carrier?

Most LNG carriers burn boil-off gas as fuel in their propulsion and power plant, which controls tank pressure and reduces SOx and particulate emissions. Some ships reliquefy the boil-off, and forcing vaporisers add fuel gas when natural boil-off is insufficient.

What firefighting medium is used for a gas fire at the manifold?

Gas carriers use fixed dry chemical powder (DCP) systems to tackle gas fires at the manifold, because powder interrupts the combustion chain reaction. Water curtains cool and protect the deck, hull and accommodation and help disperse vapour rather than extinguishing the fire.

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2026 Statistics

Key Facts: STCW Advanced Gas Tanker Exam

5 days

Typical Course Length

IMO Model Course 1.05

3 months

Gas-Tanker Service Prerequisite

STCW Reg V/1-2 para 4

FL 98%

IGC Maximum Filling Limit

IGC Code

About 10 C/hour

Typical LNG Cool-Down Rate

Cargo operations practice

-162 C

LNG Carriage Temperature

Methane boiling point

5-15%

Methane Flammable Range in Air

Gas properties

30 changes/hour

Compressor Room Ventilation

IGC Code

This advanced certificate, required by STCW Regulation V/1-2 and built on Table A-V/1-2-2 and IMO Model Course 1.05, qualifies officers with immediate cargo responsibility on liquefied gas tankers (LNG, LPG, ammonia, ethylene). The roughly five-day course ends in a written assessment, commonly multiple choice. Content spans gas carrier types (fully pressurised, semi-pressurised, fully refrigerated) and IGC Type A/B/C, membrane and Moss containment with primary and secondary barriers; cargo handling plant - submerged pumps, oil-free compressors, reliquefaction plants and boil-off gas/LNG-as-fuel management; the IGC Code, including the Certificate of Fitness, filling/loading limits, MARVS and venting; the cargo-operation sequence of drying, inerting, gassing-up, cool-down (about 10 C/hour), loading, custody transfer, and discharge with or without vapour return; ESD systems and the ship-shore link; and emergencies such as cryogenic spills, brittle fracture, water curtains and dry chemical powder firefighting. Prerequisites are basic gas tanker training plus three months gas-tanker service or one month approved onboard training (minimum three loadings and three unloadings).

Sample STCW Advanced Gas Tanker Practice Questions

Try these sample questions to test your STCW Advanced Gas Tanker exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A fully refrigerated LPG carrier of 80,000 m3 carries propane near its atmospheric boiling point. Which IGC tank type is normally fitted on such a vessel?

A.Type C pressure-vessel tanks

B.Membrane tanks with no secondary barrier

C.Type A independent prismatic tanks

D.Type B Moss spheres only

Explanation: Large fully refrigerated LPG/ammonia carriers (20,000-100,000 m3) carry cargo near atmospheric pressure and use Type A independent prismatic tanks, which require a complete secondary barrier because their material can fracture at cryogenic temperature.

2Under the IGC Code, what is the maximum allowable design vapour pressure for an independent Type A cargo tank?

A.0.25 barg

B.0.7 barg

C.2.0 barg

D.18 barg

Explanation: Type A tanks are designed using classical ship-structural methods and the IGC Code limits their maximum allowable design vapour-space pressure to 0.7 barg; above this a full secondary barrier and refrigerated carriage are required.

3A fully pressurised LPG carrier of 5,000 m3 carries propane at ambient temperature. Why does this ship require no thermal insulation or reliquefaction plant?

A.The cargo is carried as a non-volatile liquid

B.Inert gas keeps the cargo below its boiling point

C.Deck water sprays continuously cool the tanks

D.Type C tanks are designed for the saturated vapour pressure of the cargo at ambient temperature

Explanation: Fully pressurised carriers use Type C pressure vessels (typically ~18 barg) able to contain the saturated vapour pressure of LPG at ambient temperature, so the cargo stays liquid without refrigeration or insulation.

4On a membrane LNG carrier using the GTT Mark III system, what is the primary function of the secondary membrane behind the insulation?

A.To carry the static load of the cargo

B.To contain any cargo leakage through the primary membrane for a defined period

C.To act as the vapour line during loading

D.To provide structural strength to the ship's hull

Explanation: In a membrane system the inner hull provides structural strength; the thin primary membrane contains the cargo while the secondary membrane is a partial/secondary barrier required by the IGC Code to contain any leakage temporarily and protect the hull from cryogenic damage.

5Which statement correctly distinguishes a Type B independent tank (such as a Moss sphere) from a Type A tank under the IGC Code?

A.Type B requires a full secondary barrier; Type A requires only a partial barrier

B.Type B uses detailed fatigue and crack-propagation analysis and needs only a partial secondary barrier (drip tray)

C.Type B may not be used for LNG

D.Type B has a lower allowable design pressure than Type A

Explanation: Type B tanks are designed using refined analytical methods (fatigue life and crack-propagation/leak-before-failure analysis), which under the IGC Code permits only a partial secondary barrier such as a drip tray rather than the full secondary barrier required for Type A.

6At what temperature is LNG (predominantly methane) carried at approximately atmospheric pressure?

A.-42 degrees C

B.-104 degrees C

C.-162 degrees C

D.-196 degrees C

Explanation: LNG is carried as a boiling liquid at about -162 degrees C, the atmospheric boiling point of methane, in membrane or spherical (Moss) containment systems.

7During the tank preparation sequence on a gas carrier, what is the correct order of operations after a tank has been opened to air for inspection?

A.Inerting, drying, gassing-up, cool-down, loading

B.Drying, inerting, gassing-up, cool-down, loading

C.Gassing-up, inerting, cool-down, drying, loading

D.Cool-down, drying, inerting, gassing-up, loading

Explanation: The standard sequence is drying (remove moisture to prevent ice/hydrate formation), inerting (reduce oxygen to a safe level), gassing-up (displace inert gas with cargo vapour), cool-down (gradually chill the tank), then loading.

8Why is a tank dried before inerting and cool-down when loading LNG or LPG?

A.To increase the cargo's calorific value

B.To raise the oxygen content for safe entry

C.To prevent formation of ice and gas hydrates that could block valves and lines

D.To reduce the cargo's vapour pressure

Explanation: Residual moisture can freeze or form solid gas hydrates at cargo temperatures, blocking valves, gauges and lines; drying with dry inert gas removes water vapour before cool-down to prevent this.

9During inerting of cargo tanks before gassing-up, what is the typical target maximum oxygen content to be reached?

A.Below 8% by volume

B.Below 11% by volume

C.Below 21% by volume

D.Below 5% by volume

Explanation: Inerting reduces the oxygen content (typically from 21% in air) to a low value, commonly a maximum of about 5% by volume, so that when cargo vapour is later introduced the mixture cannot pass through the flammable range.

10What is the purpose of the gassing-up operation on a gas carrier?

A.To remove liquid cargo heel before dry-docking

B.To pressurise the tank above the relief valve setting

C.To displace inert gas in the tank with cargo vapour in preparation for loading

D.To warm the tank from cargo temperature to ambient

Explanation: Gassing-up introduces cargo vapour (often vaporised from a liquid heel or shore supply) to displace the inert gas/nitrogen from the tank, so the atmosphere becomes pure cargo vapour before cool-down and loading.

About the STCW Advanced Gas Tanker Practice Questions

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Key Facts: STCW Advanced Gas Tanker Exam

Sample STCW Advanced Gas Tanker Practice Questions

About the STCW Advanced Gas Tanker Practice Questions