Mitsui OSK Lines has emerged as the buyer of an LPG carrier sold by StealthGas in April as the Japanese shipping giant re-enters the ammonia business.

The Tokyo-listed company said the 35,000-cbm Green Pioneer (built 2010) has entered into a time-charter contract with Trammo, a leading international merchandising and ammonia trading company.

The 173-metre ship is now operated by the MOL Tankship unit after acquired it from Harry Vafias-led StealthGas for a price quoted by shipbrokers at $34m.