Kawasaki Receives AiP for LPG Fuel Supply System

Feb. 05, 2020


Simulated image of an LPG dual-fuel LPG carrier

Tokyo, February 5, 2020 — Kawasaki Heavy Industries, Ltd. announced today that it has obtained approval in principle (AiP) from Nippon Kaiji Kyokai (ClassNK) and the American Bureau of Shipping (ABS) for a liquefied petroleum gas (LPG) fuel supply system that enables LPG to be used as ship fuel.

As the industry faces increasingly strict gas emission regulations from the International Maritime Organization, LPG fuel is receiving increased attention as a clean-fuel alternative to heavy fuel oil. Particularly in the LPG trade market, increasing emphasis is being placed on transitioning to LPG fuel sources. By using LPG fuel, Kawasaki's LPG carriers achieve emission reductions for CO2, sulfur oxides (SOx) and other harmful substances in exhaust gases and comply with EEDI Phase 3 regulations.*

Kawasaki's fuel supply system was developed using knowledge gained through LPG carrier, liquefied natural gas (LNG) carrier, and LNG-fueled vessel design and construction, as well as marine engine design and manufacturing operations. The LPG fuel supply system received AiP from more than one classification society, which proves its high reliability. Kawasaki has started building Japan's first LPG-fueled LPG carrier equipped with this system at its Sakaide Works, with the support of ClassNK and relevant supervisory agencies.

Kawasaki plans to continue developing and providing environmentally friendly ship technologies for LPG-fueled LPG carriers, LNG-fueled vessels, liquefied hydrogen carriers (liquefied hydrogen is gaining increasing attention as a next-generation energy source), and other vessels with the aim of achieving low carbon emissions throughout society.

The main features of Kawasaki's LPG fuel supply system are as follows:

  1. Cyclical system design that is compatible with propane and butane and circulates LPG in a pressurized state capable of usage at normal ambient temperature
  2. Features a control system with established high safety performance based on a risk assessment conducted in accordance with the IGC Code
  3. Consists of equipment that can be used in LPG carriers and any other type of vessel

Diagram of the LPG fuel supply system that obtained AiP
(excluding the engine and fuel tank)

Approval in principle (ClassNK)


Approval in principle (ABS)


*  EEDI: Energy Efficiency Design Index. Compulsory international regulations requiring energy-efficiency compliance in newly built ships based on EEDI values, which specify CO2 emissions in grams for transporting one ton of cargo for one mile. EEDI regulation values apply in increasingly strict phases based on the construction-contract conclusion date and finished-ship delivery date. Phase 3 regulations (30% CO2 emissions reduction compared with baseline levels) will be introduced for certain ship types including large LPG carriers and LNG carriers contracted to be built in 2022 or later.


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