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be lowered down to 3000m water depth, fall, and 20-40m/min in twin fall mode. specifcation helicopter-deck, and accom-

Vessels having a large radius, and higher lowering Wire diameter has been kept to 109mm modation for 132 people. speeds for greater effciency,” Smith says. to avoid the heating and subsequent deg- It has a 2600sq m deck area and

The crane employs a knuckling system radation problems associated with heave 4500-tonne deck load capability at up to on the main boom, which is actuated compensation on larger diameter wires, 5m above deck, combined with a large using wire ropes, or “rope luffng,” rather Smith says. strengthened deck area for load outs of than hydraulic cylinders. Smith says it large heavy equipment.

Deck and marine equipment also allows for a higher lifting point for It also features an ice-strengthened hull lifting tall, heavy loads. The vessel has two additional cranes, for and winterization features, including

The crane is primarily designed for effcient deck operations, and complex de-icing equipment on deck, to extend subsea construction in single and double or simultaneous operations. One of the the operating season in the far North, and fall confguration, but will have triple for additional cranes, and the bulwarks, are air conditioning for operation in tropical capability, with some limitations. removable for long overhanging items. regions.

In single fall mode, the crane’s radius “Some additional simple features The vessel has two shaft-driven propel- can cover the entire deck, with up to 300- include extra deck strengthening, for lers, with diesel electric drive, and a total in double fall mode, the crane tonne load, additional capacity, and the 7000-tonne installed power capacity of 25MW, split will be able to install a 580-tonne module under-deck umbilical and fexibles between two engine rooms. to 2000m water depth, covering a 29m carousel,” Smith says. “Most compara- The new vessel will increase the capac- radius and lower to 3000m, due to having tive vessels have 5000-tonne, or less, ity in Subsea 7’s feet. Its existing heavy 6000m of hoist wire. capacity. To help install these umbilicals construction vessels mostly have up to

In double fall mode, the crane also has and fexibles, stored onboard, we have a 400-tonne capacity cranes, Smith says. a hook system and wire handling system 325-tonne vertical lay system.” “This vessel gives us either 600-tonne to ensure twisting is prevented. In triple

Preliminary vessel design was con- capacity, a 50% increase, or 900-tonne. fall, the main hoist capacities is up to 900- ducted jointly by Subsea 7 and Wärtsilä, It has also increased the hoisting speed tonne, with 21m radius. with detailed design and construction to compared to other vessels in the feet,”

The main hoist can lift 600-tonne out be completed by HHI. he says.

to 30m radius, in harbor, and the same The vessel is DP3, can transit at “It also has very good loading capaci- subsea, but at a slightly lesser radius, 15knots and operator in up to 4.5m sig- ties. It can cope with 5000-tonne under subject to the physical size of the load. nifcant wave height. It is special Purpose deck with 4500-tonne up to 5m above

Hoisting speed is 14-18m/min in single Ship code compliant, has a Norwegian deck.”

Norwegian energy analysts Rystad predict the subsea processing market will grow from US$500 million a year today,

Powerful jumper and umbilical monitoring to $8 billion by 2020.

Developments are also moving into deeper and deeper waters, with subsea

As subsea field umbilical arrays grow ever more complex then infrastructure growing in size to meet the the integrity of the components becomes increasingly critical. demands placed on it by the higher pres-

C-Kore is designed to provide assurance to field installation sures. “We see subsea lifts getting heavier engineers that their umbilical systems will meet the client and deeper,” Smith says. requirements by checking electrical integrity immediately “Spool pieces are getting longer and prior to connector make-up.

more diffcult to handle. Umbilicals and

For further information visit our website or call our sales cables are getting longer and heavier, and team on 01653 602020 project load-outs are getting heavier, with more equipment. “Heavier lifts are required for mani- folds, and subsea processing plant, caissons, and suction piles. We wanted a versatile vessel to carry out all these tasks.”

Key features of the new vessel are a new active heave compensation sub- sea construction crane, developed by

Huisman, with Subsea 7, and the vessel’s capacity—it could load out with 5000- tonne in its under-deck carousel and 4500-tonne up to 5m high on deck.

Knuckle boom crane

Tel: +44 (0) 1653 602020 | Email: [email protected] | Web: www.zetechtics.com

Zetechtics Ltd “We spent a lot of time on the crane, looking at the weights that are going to oedigital.com March 2014 | OE 75 000_OE0314_Vessels_Heavylift.indd 75 2/21/14 9:35 AM