Imperial Petroleum, the tanker company spun off from LPG player StealthGas, has acquired two more vessels that will boost its fleet to six ships.

The company, which was spun off from the Vafias family-controlled firm late last year, on Tuesday said it spent an aggregate $31m to buy the MR pair. It did not identify the vessels.

The ships are described as having been built at SLS Shipbuilding and Shin Kurushima Dockyard in 2008 and 2011 respectively, which strongly suggests they are the 46,000-dwt Clean Justice (built 2011) and the 50,300-dwt Clean Nirvana (built 2008).