OSSA LNG
Carrier library
Conventional Ocean-Going LNG CarrierConventionalEducational data

Membrane-type LNG carrier

The volumetric workhorse behind most modern LNG newbuilds.

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Class overview

Membrane carriers use a thin primary barrier supported directly by the inner hull, with the insulation carrying the cargo load. GTT NO96 and Mark III systems dominate the order book because they maximise cargo volume for a given hull and deliver very low boil-off with modern insulation.

Classification

Operational role
Conventional Ocean-Going LNG Carrier
Containment system
GTT Mark III Membrane · GTT NO96 Membrane
Tank geometry
Hull-conforming prismatic membrane tanks
Capacity class
Conventional — indicative: approximately 125,000–180,000 m³
Propulsion options
ME-GI · X-DF · DFDE / TFDE · Steam turbine
BOG management
BOG as fuel · Gas combustion unit · Reliquefaction

Key systems

ContainmentCorrugated stainless or invar primary barrier bonded to insulation panels
InsulationReinforced polyurethane foam or perlite-filled plywood boxes
Cargo handlingFull reliquefaction or boil-off gas routed to the main engines as fuel

Operational environment

Baseload ocean transport between major liquefaction and import terminals.

Safety and operational considerations

  • Membrane integrity monitoring and barrier space management are central to safe cargo operation.
  • Filling-level and sloshing guidance is project-specific and defined in the vessel's operating manuals.
  • Membrane repair requires qualified personnel and controlled conditions.

Strengths

  • Best cargo volume per metre of hull, lowering unit freight cost
  • Very low boil-off with reinforced insulation systems
  • Broad shipyard availability and a deep spares ecosystem

Considerations

  • Filling-level restrictions on some systems to avoid sloshing loads
  • Primary barrier repairs require specialist yard capability

Technical information

Status
Educational overview — editorial review required
Seeded educational summary awaiting editorial and technical review.
Last reviewed
15 September 2026
Source status
Sources pending editorial review.

Technical parameters are indicative and may vary by vessel design, generation, shipyard, operator and intended service.