Mitsui E&S starts ‘world’s first’ test run of large-bore low-speed ammonia dual fuel engine

Japanese ship equipment manufacturer Mitsui E&S has commenced test operation of the large-bore low-speed ammonia dual fuel engine as “a major step” toward decarbonizing the shipping industry.

Ammonia dual fuel engine. Courtesy of Mitsui E&S

As the company revealed, the test operation of the MITSUI-MAN B&W 7S60ME-C10.5-LGIA-HPSCR ENGINE with a maximum continuous output of 17,430 kW started on February 10, 2025, at its Tamano factory.

According to Mitsui, this is the world’s first test run with an ammonia fuel on a large-bore, low-speed, two-stroke commercial engine.

In addition to the engine, the company is developing peripheral equipment with the support of the New Energy and Industrial Technology Development Organization (NEDO) as a part of an ‘Integrated project for development and social implementation of ammonia fueled ships’, and during this test run, the verification of the safety and performance of the ammonia fuel supply system and other peripheral systems will also be carried out.