SHIP classification society ClassNK has issued an approval in principle for a dual-fuel generator engine designed to use hydrogen gas as fuel.
The AiP also covers related machinery systems and arrangements for a 160,000 cubic metre liquefied hydrogen carrier developed by Kawasaki Heavy Industries.
ClassNK said this is the first time they have issued an AiP for a generator of this kind.
In its latest examination, ClassNK reviewed the design of the dual fuel generator engines based on guidelines incorporating the International Maritime Organization’s interim recommendations for carriage of liquefied hydrogen in bulk.
It also conducted a safety assessment based on hazard identification risk assessment results.
ClassNK and Kawasaki Heavy Industries said the generator engine can switch between hydrogen and low-sulphur fuel oil.
“When hydrogen fuel is selected, boil-off gas naturally evaporated from the ship’s liquefied hydrogen cargo tanks is used as the main fuel at a calorie-based mixed ratio of 95% or higher to generate and supply electricity in board,” ClassNK said.
It expects the process to significantly reduce greenhouse gas emissions from the ship.
ClassNK said it has been working to establish standards for the use of hydrogen as a clean energy source for maritime transportation.
It has also issued AiPs for the integrated design of Kawasaki Heavy Industries’ liquefied hydrogen carrier, and for its cargo containment system and cargo handling systems.
It has also given AiPs for the vessel’s dual fuel main boilers that use hydrogen boil-off gas as fuel.
“ClassNK will actively continue to take part in advanced initiatives toward decarbonisation and also support the decarbonisation of the entire maritime industry by incorporating the knowledge gained through collaboration with front runners into rules and guidelines,” it said.
