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Ustein Unveils Heavy Lift Jack-up

By  AOG Staff Tuesday, 26 February 2019 07:36
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With the newly developed J102 heavy lift jack-up design, Ulstein says it presents its answer to the offshore wind industry’s need for fit-for-purpose, cost efficient yet future proof wind turbine installation vessels. 

Photo: Ulstein
Photo: Ulstein

The new design is part of Ulstein’s X-JACK series of heavy lift jack-up designs. “This underlines Ulstein’s firm commitment to serve the offshore renewables industry,” says Tore Ulstein, COO Design & Solutions.

“Floating vessels we see as the preferred solution for foundation installation, where self-propelled jack-ups are the chosen tool for installing wind turbines,” continues Ko Stroo, product manager at Ulstein Design & Solutions BV. “With the Ulstein J102, the latest addition to our X-JACK series, we believe it is the closest one can get to an optimal yet cost effective jack-up design. Using a high capacity crane of up to 2,500 t and 160m hook height above deck, the J102 design will allow contractors to efficiently carry and install 4 x 15MW wind turbines per round trip.”

Key in the X-JACK design is its patented lay-out with a simple cruciform primary structure to achieve weight savings of 10 to 15% and create the most direct load path during preload operations, the designer says. Positioning the legs widely apart in a square pattern results in efficient use of available deck space, at the same time effectively counteracting the crane overturning moments. This set-up also creates more body around the legs, enabling the use of large spud cans to reduce loads on the seabed.

Key features:

  • Kite-shaped hull allowing for large leg spacings
  • Main crane around stern leg on centerline
  • Cruciform primary structural arrangement superior to torsion box solution
  • No ballast water needed for lifting as the vessel is naturally balanced
  • Large spud cans, reducing bearing pressures on seabed
  • Vessel beam enables floating lift operations
  • Increased propulsion efficiency as wake of spud cans does not interfere with thruster inflow

Main dimensions:

  • Length: 145 m
  • Width: 88.4 m
  • Depth: 11 m
  • Complement: 120 POB
  • Water depth: 65 m
  • Free deck area: 6,500 m2
  • VDL: 10,500 t
  • Wind turbine capacity: 8 x 8 MW,  4 x 15 MW
  • Main crane: 2,500 t @ 39 m, 1,250 t @ 65 m
  • Main hook height: 160 m above deck

The X-JACK series includes the smaller J101, tailored for maintenance and exchange of wind turbines and the larger J103, designed to carry and install six next generation wind turbines to realize even the world’s most remote wind farm locations.

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