Boxship owner Seaspan is switching the LNG bunker tank design on the five later-delivering 15,000-teu containership newbuildings from a 10-ship order for Israeli liner operator Zim, so that the vessels can be ammonia ready.

Samsung Heavy Industries will now fit half of Seaspan’s neo-panamax vessels with 12,000-cbm, GTT-designed Mark III bunker tanks —a change from 9% nickel steel type-B tanks originally specified for the ships.