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Liquefied Gas Cargoes & IGC Code

2nd Mate

times asked: 64; times asked
questions: 4; questions
last asked: 2026; last asked

The slides, written out

AI-drawn illustration. Simplified to explain the idea, not to scale.

Slide 1 · LEARN

LEARN PRACTICE EXCEL HIGH RISK HIGH KNOWLEDGE SAFER VOYAGES LIQUEFIED GAS CARGOES HAZARDS AND IGC CODE PRECAUTIONS KNOW THE RISKS APPLY THE CODE SAIL SAFER SAFER PEOPLE CLEANER SEAS STRONGER TOMORROW SAFETY AWARENESS CODE COMPLIANCE PROFESSIONAL GROWTH Based on IMO IGC Code, 2016 Edition, as amended (July 2026 Supplement)

Slide 2 · LEARN

LEARN PRACTICE EXCEL LIQUEFIED GAS CARGOES KEY HAZARDS ON BOARD KNOW THE RISKS SAIL SAFER LNG 01 FLAMMABILITY & EXPLOSION Liquefied gases can rapidly vaporise when released. Where vapour forms a flammable atmosphere, an ignition source can result in fire or explosion. 02 ASPHYXIATION Cargo vapour or inert gas can displace oxygen and create an oxygen deficient atmosphere. 03 TOXIC EFFECTS Some cargo vapours can produce acute toxic effects, including nervous system effects. The specific hazard depends on the cargo. 04 COLD BURNS & FROSTBITE Some cargoes are carried at cryogenic or very low temperatures. Contact with cold liquid, vapour or inadequately protected equipment can cause cold injury. 05 CORROSIVITY Certain cargoes can be corrosive to personnel or materials. Cargo specific compatibility requirements must be followed. 06 REACTIVITY Certain cargoes can react with other substances or undergo self reaction such as polymerisation. 07 BRITTLE FRACTURE Low cargo temperatures can reduce the toughness of unsuitable materials and may cause brittle fracture. 08 PRESSURE RELEASE Failure of a pressurised cargo system can cause rapid release of liquid or vapour, creating a serious release, fire or explosion hazard. Reference: IMO IGC Code, 2016 Edition, as amended (July 2026 Supplement)

Slide 3 · LEARN

LEARN PRACTICE EXCEL LIQUEFIED GAS CARGOES THE FIRST LINE OF DEFENCE DESIGN • CARGO • MATERIAL COMPLY TODAY SAIL SAFER TOMORROW LNG 01 CORRECT SHIP TYPE The required ship type depends on the individual product and is specified in IGC Code Chapter 19. Type 1G Maximum preventive measures Type 2G Significant preventive measures Type 2PG Specific Type C containment requirements Type 3G Moderate preventive measures 02 TYPE 2PG – KEY LIMITS A Type 2PG ship is a ship of 150 m length or less carrying cargo in independent Type C tanks, with the following: Ship length ≤ 150 m Tank type Independent Type C MARVS ≥ 0.7 MPa gauge Design temperature ≥ −55°C 03 MATERIAL COMPATIBILITY Cargo-system materials must be suitable for the cargo and applicable temperature conditions as per IGC Code Chapter 17. Example: Certain cargoes have restrictions on copper and copper-bearing alloys. 04 VERIFY BEFORE LOADING Confirm the following before loading: Cargo is listed for carriage Valid International Certificate of Fitness Within cargo limits Approved containment system Reference: IMO IGC Code, 2016 Edition, as amended (July 2026 Supplement)

Slide 4 · LEARN

LEARN PRACTICE EXCEL LIQUEFIED GAS CARGOES CONTROL THE CARGO BEFORE • DURING • AFTER OPERATIONS SAFE OPERATIONS STRONGER TOMORROW LNG 01 GAS DETECTION Gas detection equipment must be properly maintained and tested in accordance with applicable requirements and manufacturer instructions. O2 20.9 % LEL 0 % H2S 0 ppm CO 0 ppm DETECT MONITOR STAY SAFE Flammable vapour Toxic vapour Oxygen deficiency 02 OXYGEN MONITORING An oxygen measuring instrument is required for checking inert atmospheres where applicable. Oxygen 20.9% ! Never enter an enclosed or suspect atmosphere without proper testing and entry procedures. 03 PERSONAL PROTECTIVE EQUIPMENT (PPE) Use PPE appropriate to the specific cargo and operation. Follow the cargo information, SDS and shipboard procedures. RIGHT PPE RIGHT JOB RIGHT SAFETY Respiratory protection Cold protection Chemical protection Eye and face protection 04 TEMPERATURE CONTROL Maintain cargo and containment-system temperatures within approved operating limits. Temperature instruments and alarms must be properly maintained. -162.0 °C CARGO TEMPERATURE 05 OPERATING MANUAL Cargo operations must be conducted in accordance with the approved ship-specific cargo operating procedures and manuals. CARGO OPERATING MANUAL FOLLOW PROCEDURES SAFER OPERATIONS Reference: IMO IGC Code, 2016 Edition, as amended (July 2026 Supplement)

Slide 5 · LEARN

LEARN PRACTICE EXCEL LIQUEFIED GAS CARGOES THE FINAL SAFETY CHECK CONTROL THE REACTION VERIFY THE CERTIFICATE SAME CODE SAFER VOYAGES 01 SELF REACTIVE CARGOES Cargoes liable to self reaction (e.g. polymerisation) must be sufficiently inhibited to prevent self reaction during the voyage, as required by the IGC Code. Certain cargoes also have specific inerting requirements. CONTROLLED TODAY SAFER TOMORROW 02 INHIBITOR INFORMATION Verify the following from the inhibitor certificate: Inhibitor name Quantity / concentration Date added Expected effectiveness Temperature limitations Required action if effectiveness expires INHIBITOR CERTIFICATE Inhibitor details Quantity / concentration Date added Effectiveness Temperature limits Validity confirmed 03 CERTIFICATE OF FITNESS Before loading, the Master should ascertain that: The product is listed on the International Certificate of Fitness The quantity and characteristics are within the certificate limits The cargo and operating conditions comply with the IGC Code and loading and stability information INTERNATIONAL CERTIFICATE OF FITNESS FOR THE CARRIAGE OF LIQUEFIED GASES IN BULK 04 FINAL CHECK RIGHT CARGO Check product, properties and limits RIGHT SHIP Correct type and approved systems RIGHT CONDITIONS Follow procedures and monitor RIGHT PROCEDURES Use manuals Do not rely on memory Reference: IMO IGC Code, 2016 Edition, as amended (July 2026 Supplement) KNOW MORE SAIL SAFER GO FURTHER

In exams

Asked 64 times across 4 different questions, most recently in 2026. Asked most in 2nd Mate (64).

Drafted by SailR from our daily lessons. AI-drawn illustration. Simplified to explain the idea, not to scale. Last updated 19 Oct 2026.

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