ClassNK issues guidelines for vessels using low-flashpoint fuels besides LNG

Japanese classification society, ClassNK, has released guidelines for ships using low-flashpoint fuels besides liquefied natural gas (LNG).

In order to reduce atmospheric pollution caused by sulphur oxides (SOx) and particle matter (PM) found in vessel emissions as well as weather effects caused by GHG emissions, environmental regulations have been getting more strongly enforced.

In theory, ships using alternative fuels such as LNG, LPG, and methyl/ethyl alcohol can reduce the amount of CO2 emissions by 10 percent to 20 percent compared to conventional oil fuels, and they do not contain sulphur. For this reason, alternative fuels are expected to be an effective solution for the regulations, ClassNK said.

These alternative fuels have lower flashpoints compared to traditional fuels, therefore particular attention needs to be given to ensuring adequate safety precautions when using low-flashpoint fuels in order to decrease the potential risk of fire and explosions that may arise as a result of fuel leakage onboard the ship.

International safety requirements for low-flashpoint fuels have been discussed at IMO and as a result, the International Code of Safety for Ships using Gases or other Low-flashpoint Fuels (IGF Code) has been adopted and enforced. The current code however, does not address specific regulations for alternative fuels other than LNG.

ClassNK released the guidelines for ships using low-flashpoint fuels (Methyl/Ethyl Alcohol / LPG) which outline safety requirements for other viable alternative fuels besides LNG, based on the latest technology and regulation trends in order to promote the design of alternative fueled ships.

The guidelines divide targeted vessels into three categories: ships using methyl/ethyl alcohol as fuel, ships fuelled by LPG, and liquid gas carriers fuelled by LPG. They take into consideration the properties of each fuel type and ship regulations and indicate safety requirements for the arrangement and installation of the low-flashpoint fuel related systems for minimizing risks to vessels, crew, and the environment.

The guidelines reflect current trends and will be amended periodically in accordance with any changes in the IGF Code during future IMO discussions and the rapid development of new technologies.

Speaking on the occasion, Hayato Suga, corporate officer and director of plan approval and technical solution division said, “in addition to LNG, low-flashpoint fuels like Methyl/Ethyl Alcohol and LPG are providing ships with alternative fuel options that have diverse characteristics in terms of environmental performance, availability, price, and more. Regardless of the choice, adequate safety measures are essential.”

He added that the latest guidelines have incorporated regulatory trends and our expertise proposes the appropriate requirements tailored to Methyl, Ethyl Alcohol, and LPG respectively.