GTT Pursues Developments of Alternative Fuels with Three AiPs from ABS

Mark III concept

Published Sep 7, 2023 9:00 AM by The Maritime Executive

[By: GTT]

GTT has received three Approvals in Principle (AiP1) from the classification society American Bureau of Shipping (ABS), and has signed a Joint Development Project (JDP) with this same classification society, along with the crude oil tanker company, DHT Holdings Inc., on its latest projects in alternative fuels.

The three AiPs were presented to Philippe Berterottière, Chairman and CEO of GTT, by John McDonald, Group President and COO of ABS, during the Gastech exhibition in Singapore.

These AiPs cover the following projects:

  • A concept for an LNG dual-fuel Very Large Crude Carrier (VLCC) developed in collaboration with the Finnish ship designer Deltamarin, fitted with a LNG fuel tank of 12,500 m3 equipped with GTT’s Mark III system;
  • A concept for an LNG dual-fuel Suezmax tanker also developed in collaboration with Deltamarin, fitted with a LNG fuel tank of 5,500 m3 equipped with GTT’s Mark III system;
  • A concept for a Mark III LNG fuel tank with a design pressure up to 1 bar gauge (barg) for LNG fuel application.

The concepts developed by GTT and Deltamarin aim at maximising vessel autonomy through the use of a large capacity tank, which allows ship-owners and charterers to benefit from longer trade navigation with a single refuelling operation without any impact on cargo capacity. The energy efficiency of these concepts was studied with the latest simulation tools and a holistic approach, providing the lowest emissions level in this ship size class.

The 1 barg design improves operational flexibility, for many types of LNG-fuelled vessels from container ships to bulk carriers and tankers, by providing an increased pressure range in the LNG fuel tank, with longer pressure holding time (increase in pressure in the event of zero or very low consumption) and an ability to bunker and store LNG at warmer temperatures.

Furthermore, the Joint Development Project signed with ABS, and the crude oil tanker company, DHT Holdings Inc. focuses on optimising the design of the VLCC, exploring the total cost of operation with the analysis of the operating profile and fuel availability at frequently visited ports. The collaboration also addresses topics such as LNG fuel volume, tank size optimisation and the impact on regulatory measures such as Carbon Intensity Indicator (CII).

Philippe Berterottière, Chairman and CEO of GTT, declared: "Obtaining three AiPs from ABS and launching a JDP represents a significant achievement for GTT. Our innovative concepts, encompassing LNG-fuelled VLCCs, Suezmax tankers, and advanced LNG fuel tank designs, underline our dedication to advancing sustainable maritime solutions. These steps reinforce our commitment to operational excellence, with ABS as a valued partner in our journey.”

John McDonald, Group President and COO of ABS, said: “LNG has significant potential to improve the emissions performance of vessels, including VLCCs. The flexibility offered by dual-fuel operations, combined with the potential to improve CII rating, could well contribute to a longer lifespan and increase attractiveness to charterers. ABS is proud to be able to use its experience to contribute to these important development projects.”

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