Objective/Scope: International Maritime Organization (IMO) announced the initial strategy for GHG (Green-House Gas) emission of ships according to “Paris Climate Agreement”. In order to resolve the GHG emission issue from ships, a demand for GHG solution technologies is increasing such as alternative fuels and energies. Recently, some reports by some companies and research centers have been presented some positive results on NH3 for ship GHG reduction. And MAN Energy Solutions presented some development plans on ammonia engines for ship CO2 emission reduction. DSME (Daewoo Shipbuilding & Marine Engineering) also thinks that ammonia can be one of options as ship fuel…