Gas Tanker Course

Lesson 1 • Types of Gas Tankers

Covers fully pressurised, semi-refrigerated, and fully refrigerated vessel designs. Connects hull and tank configuration to cargo compatibility decisions.

Lesson 2 • International Regulatory Framework

Introduces the international gas carrier codes, flag state requirements, and port state control expectations. Grounds students in compliance obligations before operational topics.

Lesson 3 • Liquefied Gas Cargo Categories

Distinguishes LPG, LNG, petrochemical gases, and ammonia by physical state and hazard profile. Provides the cargo knowledge base for all subsequent chapters.

Lesson 1 • Toxicity and Asphyxiation Risks

Covers exposure limits, physiological effects, and oxygen deficiency hazards for toxic gas cargoes. Prepares students to select and use appropriate personal protective equipment.

Lesson 2 • Flammability and Explosion Hazards

Defines flammable limits, ignition energy, and vapour cloud behaviour for common gas cargoes. Establishes the scientific basis for gas detection and hot-work controls.

Lesson 3 • Reactivity and Cargo Compatibility

Analyses polymerisation, corrosion, and incompatibility reactions relevant to gas cargoes. Guides students in preventing dangerous cargo interactions during loading and carriage.

Lesson 4 • Physical Properties of Liquefied Gases

Examines boiling point, vapour pressure, density, and specific volume for key cargoes. These properties directly govern tank design limits and cargo handling parameters.

Lesson 1 • Pressure and Temperature Control Systems

Explains reliquefaction plants, boil-off management, and cargo heater operation. Demonstrates how thermal control maintains cargo within safe design parameters.

Lesson 2 • Cargo Piping and Valve Systems

Details liquid and vapour line configurations, valve types, and emergency shutdown integration. Students trace cargo flow paths and identify isolation points.

Lesson 3 • Instrumentation and Alarm Systems

Reviews level gauging, pressure transmitters, gas detection, and high-level alarms. Connects instrument accuracy to safe cargo quantity management and hazard detection.

Lesson 4 • Cargo Pumps and Compressors

Covers deepwell, submerged, and centrifugal pump types alongside vapour compressor operation. Links pump selection to cargo properties and discharge rate requirements.

Lesson 1 • Hazardous Zone Classification

Defines zone 0, 1, and 2 areas on gas tankers and the equipment standards required in each. Enables students to enforce electrical and ignition source controls correctly.

Lesson 2 • Atmosphere Control in Cargo Spaces

Addresses ventilation strategies, purging sequences, and atmosphere verification for cargo holds and void spaces. Directly supports safe enclosed space entry procedures.

Lesson 3 • Portable Gas Detection Equipment

Covers bump testing, calibration, and correct use of portable detectors in various atmospheres. Prepares students for enclosed space entry and hot-work gas testing.

Lesson 4 • Principles of Gas Detection

Explains catalytic bead, infrared, electrochemical, and photoionisation sensor technologies. Grounds equipment selection in the physical and chemical properties of target gases.

Lesson 1 • Loading Operations Management

Guides students through connection, initial flow, topping-off, and disconnection during loading. Emphasises rate control, ullage monitoring, and overflow prevention.

Lesson 2 • Tank Preparation and Inerting

Details gas-freeing, inerting, and gassing-up sequences for tank changeover. Prepares students to manage atmosphere transitions without creating flammable or explosive conditions.

Lesson 3 • Discharging Operations Management

Covers pump start-up, stripping, and tank stripping to maximise cargo outturn. Links discharge efficiency to commercial performance and terminal requirements.

Lesson 4 • Ship-Shore Interface and Communication

Addresses information exchange, emergency signal systems, and terminal coordination throughout transfer. Reinforces that effective communication is a primary safety control.

Lesson 1 • Enclosed Space Hazard Identification

Identifies oxygen-deficient, toxic, and flammable atmospheres found in gas tanker enclosed spaces. Establishes the hazard baseline that justifies the permit-to-work system.

Lesson 2 • Rescue from Enclosed Spaces

Trains students in non-entry rescue methods, resuscitation, and coordination with emergency services. Prevents the common tragedy of rescuers becoming additional casualties.

Lesson 3 • Pre-Entry Atmospheric Testing

Details the sequence and acceptance criteria for oxygen, flammable gas, and toxic gas testing before entry. Ensures students can make a scientifically sound entry decision.

Lesson 4 • Permit-to-Work System Operation

Explains permit issuance, authorisation levels, validity periods, and cancellation procedures. Connects permit discipline to the prevention of unauthorised and unsafe entries.

Lesson 1 • Gas Tanker Emergency Scenarios

Analyses cargo release, fire, explosion, and toxic gas escape scenarios with structured response sequences. Builds decision-making speed and accuracy under simulated pressure.

Lesson 2 • Emergency Plans and Drills

Covers shipboard emergency plan structure, drill design, and post-drill critique methodology. Reinforces that practised procedures reduce response time and error rates.

Lesson 3 • Personal Protective Equipment for Gas Hazards

Details chemical protective suits, SCBA, and escape breathing devices appropriate to gas tanker hazards. Ensures students can select, don, and maintain PPE correctly.

Lesson 4 • Fire Prevention and Protection Systems

Covers dry powder, water spray, and foam systems specific to gas tanker fire scenarios. Connects system selection to the flammability characteristics of gas cargoes.

Lesson 1 • Boil-Off Management and Cargo Conditioning

Explains boil-off rate calculation, reliquefaction decisions, and cargo conditioning for delivery specification. Links thermal management to commercial and safety outcomes.

Lesson 2 • Structural Stress and Sloshing

Addresses longitudinal bending stress, shear force limits, and sloshing loads in partially filled tanks. Guides students in avoiding structural damage during cargo operations.

Lesson 3 • Stability Principles for Gas Tankers

Applies metacentric height, free surface effect, and dynamic stability concepts to gas tanker loading conditions. Connects stability theory to practical loading sequence decisions.

Lesson 4 • Cargo Calculation and Planning

Covers density correction, volume-to-mass conversion, and multi-grade cargo planning for gas tankers. Provides the quantitative foundation for accurate cargo documentation.