Energy Duchess, the first of two platform supply vessels ordered by Norway’s Golden Energy Offshore, was launched on Tuesday at the ROC yard in Nantong, China.

Energy Dutchess and her sister vessel are scheduled for deliveries in 2016. The vessels are based on the PX121 design from Ulstein, and customised with one extra accommodation deck.

The PSVs have an overall length of 83.4 metres, a beam of 18 metres, and a deadweight (dwt) of 4,000 tonnes.

The vessels are equipped with DP2 dynamic positioning, as well as oil recovery and fire-fighting systems. They are recognized as medium-sized PSVs and have a cargo deck of approximately 850 square meters.

The PSVs can accommodate up to 30 persons, and are being built according to IMO’s SPS code for Special Purpose Ships.

In addition, the vessels will be prepared for the installation of an AHC Crane with up to 67 tonnes capacity and an ROV mezzanine deck, which means they can be configured for IMR (Inspection, Maintenance, Repair), ROV support, trenching and light subsea construction work.