LNG as a fuel

GTT and its partners offer competitive storage and handling solutions along the LNG supply chain dedicated to vessel bunkering. These services cover the whole logistics chain, from the LNG liquefaction and export terminal in gas producing countries down to the propulsion engine, generator set or other gas consumers onboard a merchant vessel.

GTT applications for LNG bunkering include: 

  • Small and medium scale LNG land storage, LNG floating storage, LNG Gravity Based fuel gas handling system Storage
  • Small and medium scale LNG carriers used as feeders or bunkering ships / barges used for ship to ship transfer
  • LNG fuel tanks for commercial ships using Natural Gas as fuel
  • LNG transfer systems
  • Assisting clients in specifying their requirements and translating these into a membrane based solution
  • Elaborating concept designs
  • Developing basic designs including sloshing assessment, bill of materials, cost evaluations and building methods
  • Developing detailed engineering during project ex­ecution. GTT is committed to provide guidance and assistance all along the project phase for the Fuel Gas Handling Systems, thanks to its experience and know-how acquired over several decades in the design of cargo handling systems for LNG carriers, GTT is able to produce basic design for FGHS taking into account cost, ar­rangement and operational constraints. Through its network and knowledge of the market for the supply of process equipment, GTT can provide cost estimates for turnkey FGHS and assistance dur­ing the bidding and procurement phases
  • GTT can provide assistance to set up the indus­trial scheme for the supply of the turnkey package adapted to the geographical area of construction of the LNG fuelled ship through its network of partners (engineering companies, EPC contractors, process integrators, shipyards)
  • GTT studies and deliverables cover process diagrams (blocs, PFD, P&ID), equipment sizing (list, capacity, utilities, outline specification), system integration (lay­out, overall weight, footprint & cost), BOG manage­ment sizing (compliance with regulations, technical economical optimization along operational profiles)
  • GTT continuously develops innovative solutions and products to further improve the efficiency of LNG / gas handling solutions from bunker station to gas consumers

Main advantages of membrane are:

  • Optimization of the ratio LNG volume / space oc­cupied
  • Minimum loss of cargo capacity

Membrane solutions are easily implemented either via a retrofit or a newbuild and can be installed afloat in parallel to other on-going construction activities thereby minimizing the building retrofit schedule.
Pressure in the tank up to 0,7 barg (and up to 2 barg under certain conditions) allowing flexibility of use for boil-off Gas management. Boil-off rate and BOG handling system optimized to fit idle condition of the ship (lowest electric con­sumption).

LNG fuelled vessel
Tank of a LNG fuelled vessel        

LNG fuelled contenership
Tank of a LNG fuelled containership


The volumetric efficiency and space optimization advantages of membrane technology are shown in LNG barge applications. The first dedicated LNG barge (2,200 m3) for the marine market in North America is based on a conceptual design fully developed by GTT and the first of its kind was ordered in February 2015.

Main barge features:

  • Single cargo tank of robust GTT Mark III Flex technology with no operational liquid level restriction and achieves optimized BOR of 0.38%/day
  • Flexible onboard reliquefaction BOG handling system ensures cold LNG delivery to receiver vessel
  • GTT REACH4 bunker mast ensures safe and reliable LNG transfer, including vapor return capability from receiver vessel

bunker barge in North Amercia
LNG Bunker Barge in North Amercia (2,200 m3)


While the logistic and storage facilities for large LNG volumes intended for the supply of the gas grid at national level are well in place thanks to large LNG import terminals and large LNG carriers, the distribution and storage of smaller volumes of LNG intended for use as fuel on ships are only in their infancy. GTT membrane technologies are already available for building storage facilities of small to medium size (typically 5.000 m3 to 30.000m3 or more).


Target Capacity: from 2k to 30k m3

- Metallic outer tank
- Without secondary barrier
- Single containment
- Associated to a simplified mem­brane arrangement
- Sump is a relevant option


Target Capacity: from 2k to 10k m3

- Metallic outer tank, simple design easy to prefabricate
- Membrane system similar to LNG carriers


- Precast concrete pieces for sur­rounding structure
- Horizontal assembly
- Insulation and membrane pre-assembly on concrete surfaces in factory


- Geometric adaptability minimizing footprint and maximizing storage
- Low pressure containment eliminating the risk of BLEVE (boiling liquid expanding vapor explosion)
- Flexible choice of construction method: building onsite or pre-fabricate


The Ship-to-Ship LNG transfer solution is a key element of the supply chain of LNG as fuel. Although similar systems already exist in the offshore industry, they appear to be quite complicated and unsuitable for LNG Bunkering.

GTT has developed REACH4TM, an innovative adapta­tion of a well proven system, already used for bunkering of conventional fuel. REACH4TM is designed to fit on the LNG bunker vessel, permitting a simple and safe transfer of LNG fuel to a client vessel.

The bunker mast has been adapted to LNG constraints, with pipes suitable for cryogenic conditions and a reinforced structure. It is well-suited to bunker most ships, whatever their bunker station arrangement and can be also used to load the bunker vessel.

Bunker barge tank scanner

LNG fuelled passenger ship tank scanner

LNG fuelled container ship tank scanner