owner is the Singapore based Otto Offshore Ltd., who will receive all vessels in 2016. The contract also includes an option for four vessels.
These PX121 vessels are capable of supporting offshore activities which are being carried out further from shore and in deeper waters. The vessels can carry flexible loads. In addition to tanks for various contents such as oil, water, and drilling fluids, they have four stainless steel tanks for flammable liquids or corrosive chemicals (LFL tanks).
The vessels are certified by DNV and carry the ‘Clean Design’ notation. Measuring 83.4 metres in length and a beam of 18 metres, they have a cargo deck of 840 square metres and a load capacity of 4,000 tonnes (dwt). Each ship has a maximum speed of approximately 14.5 knots and accommodates 30 people. They carry the X-BOW hull line design, which is efficient on all draughts, a factor critical for PSVs, as they frequently operate with varying draughts.
Each ship will be equipped with dynamic positioning system Class II and meets the requirements of Comfort Class. “The PX121 vessels boast a performance you would normally expect from a larger PSV. Being able to do this at a medium-sized PSV cost, with reduced emissions and fuel consumption, the ship owner gets a favourable combination of two market areas,” said Sigurd Viseth, managing director in Ulstein Design & Solutions.
The contract with Ulstein includes the deliveries of design, engineering and main equipment. An extensive delivery from Ulstein Power & Control includes integrated control systems, bridge (radio, navigation), switchboard, diesel electric propulsion and frequency converters, and communication systems. The vessels will be prepared for offshore crane and mezzanine deck for ROV. With this latest ship design contract for Wuchang Shipbuilding and Otto Offshore, the total number of PX121 PSV designs have reached 30.
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