Seafastening system for marine transportation

Seafastening system for marine transportation

Transportation by sea of monopiles for offshore wind farms. Commissioned by Conbit Engineering, Holmatro supplied a seafastening system.

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Commissioned by: Conbit Engineering
Location: United Kingdom


For the installation of offshore wind farms, the components, including monopiles (hereinafter: MP’s) are transported by sea on specially constructed heavy-lift vessels.


Conbit Engineering in Best, Holland, designed the so-called seafastening construction for the UK installation company Seajacks that ensure that the MPs remain securely in position, even in the most extreme circumstances. The MPs (weight: 600 ton p/pcs) rest on two support points and are secured to the deck with straps with the aid of a saddle construction. Four straps, each with a pre-stressed capacity of a minimum of 50 tons, must be anchored to each support point. The pre-stressing is ensured with the aid of an auxiliary construction with 2 large stud ends.


Holmatro supplied the pulling cylinders, each with a capacity of 60 tons, for this purpose. In view of the fact that cylinders remain in the construction for a long period of time, they have been made resistant to the conditions at sea. They are also fitted with special couplings that are suitable for offshore applications.

Would you like to know more about this project? Contact us via e-mail [email protected] or call +31 (0)162 751500.