Classification and technical services provider American Bureau of Shipping (ABS) has released a guide to help the maritime industry prepare new-builds for future conversion to LNG fuel.

Titled The Guide for LNG Fuel-Ready Vessels, the document offers a detailed review and approval, as well as associated class notation for clients to plan conversions.

ABS global gas solutions vice-president Patrick Janssens said: "The projects ABS has already worked on demonstrate the variability from the designer’s and owner’s perspective of the requirements associated with the term LNG-ready.

"The ABS Guide and notation…go beyond the basics to help clients specify work to be done in the construction phase and when they are ready to convert."

"Rather than rely solely on current notations and descriptive notes to express to what extent a ship is LNG-ready, the ABS Guide and notation are powerful tools that go beyond the basics to help clients specify work to be done in the construction phase and when they are ready to convert."

The instructions consist of a basic level of concept design approval along with a design review for approval in principle (AIP) and two optional levels for general design approval and installed equipment.

Within this, the first optional level is a general design review, which helps the owner choose a conversion with a reviewed design package for the gas-fuelled system.

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Level two is detail design approval and installation offering a comprehensive design review and survey of a system that will be installed on the LNG-ready ship.

The first level gives an AIP and a descriptive note in the ABS record, while the second level is a statement of compliance with a descriptive note listing the parts of the system that have been reviewed.

The third level, LNG Fuel-Ready class notation, confirms that the fuel system is in full compliance with the ABS Guide for gas-fuelled ships.