Sheerlegs primarily carry out specialist heavy lift activities around the world on projects, requiring specialist in-house engineering skills. Most of the floating sheerlegs have their own means of propulsion.
Boskalis' floating sheerlegs have lifting capacities ranging from 400 to 5,000 tons.
Bokalift 1 crane vessel
In 2017 Boskalis converted one of its semi-submersible heavy lift vessels into a self-propelled crane vessel, including a 3,000 ton revolving crane. The available deck space of 165m x 43m is unique in its sort. The Bokalift will be used:
- to install jackets and monopiles for offshore wind turbines
- for the decommissioning of obsolete oil and gas platforms
- for transport and installation of new-build oil and gas production platforms.
Due to its DP-2 capabilities there is no loss time for anchor spread deployment. The vessel can accommodate 150 persons and will have a helicopter deck available for offshore transfers. Delivery is expected at the beginning of 2018.
A sister vessel is also scheduled for conversion into a 3,000 ton crane vessel.
In 2016 the Giant 7 has been converted into a construction vessel with a 600 ton revolving crane and accommodation for 73 persons.