The regulatory frame
Gas carrier management sits at the technical top of the industry. The cargo is cryogenic or pressurised, the containment systems are unforgiving, the charterers are typically large energy companies with their own inspection regimes, and the crew competency requirement is the highest of any commercial segment.
It is also the segment where management fees are least negotiable, for the straightforward reason that the pool of managers with a credible gas track record is small.
Gas carriers are built and operated under the IGC Code (International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk), which sits alongside SOLAS and MARPOL. Ships using gas as fuel — an expanding category — fall under the IGF Code. Crew competency requirements sit in STCW, with specific basic and advanced training for liquefied gas tanker cargo operations.
| Instrument | Governs |
|---|---|
| IGC Code | Construction and equipment of gas carriers |
| IGF Code | Ships using gases or low-flashpoint fuels |
| STCW V/1-2 | Gas tanker crew training and certification |
| SIGTTO guidance | Industry best practice, widely treated as de facto standard |
| Terminal requirements | Ship-shore compatibility, often the binding constraint |
Containment systems and what they demand
| Type | Characteristic | Management implication |
|---|---|---|
| Membrane (LNG) | Thin primary barrier on hull insulation | Extreme care on thermal cycling; nitrogen monitoring |
| Moss / spherical (LNG) | Self-supporting tanks | Different inspection regime; deck visibility |
| Type A (LPG, fully refrigerated) | Prismatic tanks with secondary barrier | Temperature control discipline |
| Type C (LPG, pressurised/semi-ref) | Pressure vessels | Simpler, but pressure and relief valve integrity critical |
Membrane systems in particular impose operating limits that a manager must enforce absolutely — cooldown rates, filling limits and sloshing avoidance in partial fillings. A single serious membrane incident can put a vessel out of service for a very long time.
Boil-off: the commercial-technical intersection
LNG boils continuously. What happens to that gas is simultaneously a technical question, an environmental question and a commercial one.
| Handling method | Effect |
|---|---|
| Burn in dual-fuel engines | Boil-off becomes propulsion fuel |
| Reliquefaction | Cargo retained; consumes power |
| Gas combustion unit | Disposal without propulsion benefit |
| Venting | Not acceptable in normal operation |
Methane slip — unburnt methane passing through the engine — matters more now than it did. EU ETS covers methane and nitrous oxide alongside CO₂ from 2026, and FuelEU Maritime's greenhouse gas intensity metric is calculated on a well-to-wake basis, which captures methane's high global warming potential. A vessel whose LNG advantage is eroded by slip is a different commercial proposition from one whose engines are well managed.
UNCTAD reports that more than half of newbuilding tonnage on order is designed for alternative fuels, while over 90% of the active fleet by tonnage still runs on conventional fuel. That gap is a competency transition problem, and gas carrier managers are the group best placed to sell into it.
Crew competency: the real barrier to entry
Gas carrier officers require advanced liquefied gas tanker cargo operations training plus documented sea service on gas carriers. Building that pool takes years, and it cannot be bought quickly in a market short 39,100 certificated officers overall.
What a credible gas manager should be able to evidence:
- Senior officer retention specifically on gas tonnage, three-year series
- Number of officers with more than five years of gas experience
- Simulator training programme for cargo operations, with hours per officer
- Cadet-to-gas-officer development pathway, with actual conversions
- Emergency response exercises covering cryogenic release and fire
- Terminal familiarity across the trading pattern
Technical priorities
| System | Why it dominates attention |
|---|---|
| Cargo containment and insulation | Catastrophic failure mode |
| Nitrogen and inert gas generation | Barrier space integrity |
| Reliquefaction / gas handling plant | Availability drives cargo retention |
| Dual-fuel main engines | Methane slip, fuel changeover reliability |
| Gas detection | Dense, safety-critical, calibration-intensive |
| Emergency shutdown and ship-shore link | Terminal acceptance depends on it |
| Cryogenic PPE and enclosed space procedures | Crew survivability |
Why fees are higher
Gas management carries a premium because it must fund: more superintendent attendance, higher officer wages against a scarce pool, simulator and specialist training, denser inspection preparation, and technical staff ashore with genuine gas expertise. Owners tendering gas management against tanker benchmarks will get either a refusal or a proposal that is not what they think it is.
fleet fuel data from UNCTAD Review of Maritime Transport 2025; workforce data from BIMCO/ICS 2026; regulatory references to the IGC and IGF Codes, STCW, Directive (EU) 2023/959 and Regulation (EU) 2023/1805. Reviewed by the Zeaclub Editorial Team, 24 August 2026.
Frequently asked questions
What qualifications do LNG crew need?
STCW basic and advanced training for liquefied gas tanker cargo operations, supported by documented sea service on gas carriers, plus company and terminal-specific familiarisation.
What is boil-off gas?
LNG vaporising in the cargo tanks due to unavoidable heat ingress. It is managed by burning it as fuel, reliquefying it, or consuming it in a gas combustion unit.
Is LNG a clean fuel?
It reduces sulphur oxides, particulates and — depending on engine technology — carbon dioxide relative to conventional fuel oil. Its benefit under well-to-wake accounting depends heavily on how much methane escapes unburnt, which is why methane slip is now a central engineering question.
Can a tanker manager move into gas?
Only with a deliberate multi-year investment in officers, shore staff and training. The management systems transfer; the competency pool does not.