Crane ship conversion to feature Wärtsilä thruster

Malcolm Latarche

Malcolm Latarche · 25 February 2020


A comprehensive thruster solution from Wärtsilä will enable Netherlands based Boskalis to convert Forte its existing heavy lift semi submersible to create the crane vessel Bokalift 2. In addition to addressing the technical challenges imposed by the project, Wärtsilä has also committed to meeting a demanding delivery schedule for the equipment.

Wärtsilä will supply four retractable steerable thrusters and thruster controls, as well as two tunnel thrusters. The proven retraction system, combined with the energy efficient 8° tilted thruster, is a key factor in enabling effective station-keeping performance. The thrusters’ retractability also enables shallow draft operations.


“Wärtsilä’s thruster solutions enable this kind of high specification vessel to operate successfully in sustainable energy installation projects. Furthermore, the energy efficiency of our thrusters reduces fuel consumption, which at the same time limits emission levels,” said Stefan Wiik, Vice President, Asset Management Services, Wärtsilä Marine.

Last year Boskalis together with a local partner was awarded the contract for an offshore wind project in Taiwan. On the back of this project Boskalis decided to invest in a new crane vessel. It will do so by converting Forte to create the Bokalift 2 crane vessel, with 7,500m2 of free deck space and a crane with a lifting capacity of 4,000 tonnes and a lifting height of over 100m. Bokalift 2 will make its debut on the wind project in Taiwan and is suitable for a wide range of projects: offshore wind projects, the installation and decommissioning of oil and gas structures, and salvage work. Boksalis previously converted Forte’s sister vessel Finesse into Bokalift 1 in 2017.

The Journal

Published every February the journal is now recognised as the highest quality publication that covers all aspects of maritime technology and regulation and a must read for the industry.

More Details