sx121 ulstein psv design

Ulstein’s SX121 design

Ulstein announced today they have entered into a contract with Island Ventures II LLC, a joint venture partnership between Norwegian offshore operator Island Offshore, and Louisiana-based Edison Chouest Offshore, for the delivery of a multifunctional offshore vessel based on their SX121 design, with an option for an additional vessel. The vessel is prepared and tailored for the well intervention, IMR and SURF segments, and meets the latest requirements for both well intervention and offshore construction work. The newbuild is scheduled for delivery in May 2014.

“We are very happy that Island Offshore once again has ordered an advanced offshore construction vessel from ULSTEIN. We will do our utmost to deliver a quality vessel that they can benefit from for many years to come,” says Gunvor Ulstein, CEO in Ulstein Group.

“We are looking forward to adding this vessel to our fleet. The cooperation between our two companies has been very good on previous building projects, and we are looking forward to working with ULSTEIN on the construction of this multifunctional vessel,” says HÃ¥vard Ulstein, Managing Director in Island Offshore.

The ship will be based on the proven and solid SX121 design, a platform on which ULSTEIN has previously built five ships. She will be customised to meet Island Offshore’s functional requirements and wishes, which are based on their experience from the type of operations the vessel will be performing.

The 130 metre long and 25 metre wide ship will be DP3 equipped and capable of performing subsea operations at depths down to 3000 metres. The vessel can be rigged for well intervention and is prepared for the laying of flexible pipes and cables on the seabed through a VLS tower (vertical lay system). It also has room for a rotating carousel below deck with a capacity to load 2500 tons.

An active heave compensated (AHC) offshore crane with a 250-ton capacity at 14 metres outreach and a below-deck winch will be installed on board. The vessel will carry two deep-sea work ROVs (remotely operated vehicle), one to be launched from the starboard side and one through the vessel’s moon pool. The ship is designed with a large cargo deck for transport of equipment for a multitude of operations. She will be equipped with diesel electric propulsion and three azimuth main thrusters powered by six large generator sets.

The vessel with a crew capacity of 130 will be built in accordance with the latest international environmental and safety requirements and will meet the most stringent HSE requirements on the Norwegian continental shelf as well as regulations for floating oil and gas installations. Consequently, the ship also complies with the ESD requirements (Emergency Shut-Down). In the event of evacuation, both the starboard and port side life boat can accommodate the entire crew.

Island Offshore currently has four vessels delivered by ULSTEIN in their fleet: The well stimulation vessel ‘Island Patriot’, the subsea construction vessel ‘Island Pioneer’, and the two subsea construction and intervention vessels of SX121 design, ‘Island Constructor’ and ‘Island Intervention’.

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