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Class notations

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DNV GL offers the class notations GAS FUELLED and GAS READY.

GAS FUELLED

This is a mandatory class notation for ships using gas as fuel. The class notation is granted when the vessel complies with the DNV rules for classification of ships, Part 6, Chapter 13 Gas Fuelled Ship Installations .

The requirements cover all aspects of the gas-fuel installation, from the ship’s gas-fuel bunkering connection all the way up to and including all gas consumers. The rules are applicable for installations where natural gas is used as fuel. Other gases are subject to special consideration.

By the end of 2015, the new gas-fuelled rules will be published incorporating the latest developments from IMO, making the content consistent with the IGF Code draft. The class notation is mandatory for any newbuilding being built with gas as fuel, either with gas-only or dual-fuel concepts.

GAS READY

This is a voluntary class notation for ships prepared for conversion to the use of gas as fuel. The class notation is granted when complying with DNV rules for classification of ships, Part 6, Chapter 35 Tentative Rules for Gas Ready Ships.

The GAS READY notation assists owners who, at the newbuilding stage, want to include preparation for a potential future conversion to gas-fuel operation. It provides clear guidance across a relevant scope of topics for all parties involved in the newbuilding project: yard, owner, designer, approval engineers and surveyors.

The notation has different levels and corresponding requirements. The minimum mandatory level for obtaining the class notation includes:

  • Verification of compliance with GAS FUELLED rules for a future LNG-fuelled version of the design
  • Installation of main engine(s) capable of being converted to dual-fuel operation

In addition, optional levels may be included. For example, you can choose to include preparation for later installations or for actual installation and certification of parts of the LNG fuel systems.

LFL FUELLED

This is a mandatory class notation for ships using methyl alcohol or ethyl alcohol as fuel. The class notation is granted when complying with DNV rules for classification of ships, Part 6, Chapter 32 Tentative Rules for Low Flashpoint Liquid Fuelled Ship Installations.