OSSA LNG
Carrier library
FSUConventionalEducational data

FSU — floating storage unit

Storage capacity on the water, without regasification on board.

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Class overview

An FSU is a moored vessel used purely for LNG storage. Regasification, if required, happens on a separate unit or ashore. FSUs are often older carriers redeployed as storage, and they support transhipment hubs, bunkering operations and terminals whose onshore tankage is limited.

Classification

Operational role
FSU
Containment system
GTT NO96 Membrane · Moss / Spherical Self-Supporting Type B
Tank geometry
Membrane or spherical tanks, storage only
Capacity class
Conventional — indicative: approximately 125,000–180,000 m³
Propulsion options
Steam turbine · DFDE / TFDE
BOG management
BOG as fuel · Gas combustion unit

Key systems

StorageCargo tanks held cold and managed for long station-keeping periods
TransferShip-to-ship transfer arms or hoses for loading and discharge
Boil-offVapour handled as fuel or through a gas combustion unit

Operational environment

Permanently or semi-permanently moored storage, typically paired with separate regasification capacity.

Safety and operational considerations

  • Long mooring periods shift the inspection and maintenance regime away from trading patterns.
  • Cargo transfer operations to and from the unit follow ship-to-ship procedures.
  • Hull and containment condition management reflects limited or no transit time.

Strengths

  • Extends usable life of older carrier hulls
  • Adds storage volume without onshore tank construction
  • Buffers supply between large carriers and smaller distribution vessels

Considerations

  • Provides no regasification capability on its own
  • Requires a compatible partner unit or shore plant

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.