Former gas shipowner Jacques de Chateauvieux has re-emerged in the industry as he signed an initial deal with China's Jiangnan Shipyard for up to four of a new type of very large green ammonia carrier.

Jiangnan said on Friday that it has inked a memorandum of cooperation with de Chateauvieux's investment company JS & Co for two ammonia-fuelled, 93,000-cbm vessels, plus an option for two more.