SSCV Sleipnir is a semi-submersible crane vessel (SSCV) owned and operated by Heerema Marine Contractors. It is named for Sleipnir, the eight-legged horse ridden by Odin in Norse mythology. The vessel is equipped with two revolving cranes built by Huisman Equipment B.V., each with a capacity of 10,000 t (11,000 short tons); the main cranes can be operated in tandem to jointly lift 20,000 t (22,000 short tons). It was ordered in 2015 and built in Singapore by Sembcorp Marine. After its completion in 2019, SSCV Sleipnir succeeded Heerema’s earlier SSCV Thialf as the largest crane vessel in the world.
The vessel is used for the installation and decommissioning of major offshore facilities worldwide. The dual cranes provide for heavy lifting capacity both to install and remove jackets, topsides, and new types of seabed processing equipment. Furthermore, the cranes can be utilised for the installation of foundations, moorings and structures in deep water. It can work in shallow water as well as ultra-deep water.
The vessel has two heavy-lifting offshore cranes with a 10,000-tonne lifting capacity each, which can lift the equivalent weight of 20,000 cars in tandem.
The 129m (423-ft) high lifting capacity provided by the cranes’ main hoist also facilitates the placement of heavy topsides modules at higher elevations. Other stand-out features include greater workability in harsher environments due to the design of the columns. The vessel also boasts a large reinforced work deck area for carrying multiple modules.
When the cranes are fully extended, the vessel will reach 220 metres – more than 20 metres higher than the iconic Marina Bay Sands in Singapore (or 85 metres higher than the London Eye).
The Sleipnir is self-propelled and has a minimum service speed of 10 knots, with power generated by means of dual-fuel engines – Marine Diesel Oil (MGO) & LNG. Station-keeping is by means of dynamic positioning (DP3) or mooring system.
The living quarters accommodate up to 400 persons in single and double cabins. All quarters have heating and air conditioning facilities.
Sleipnir’s dynamic ballast and de-ballast system is a joint engineering effort by Sembcorp Marine and Heerema. Its Liquefied Natural Gas (LNG) system is the world’s first Type-C LNG tank installed in an enclosed column.
- Sleipnir sets 15,300-tonne lift record. Cranepedia. 29 Sep 2019.
- Sleipnir completes 1st decommissioning project. Cranepedia. 21 May 2020.
- Heerema’s Sleipnir Bunkers Almost 3,300t LNG Setting World Record. Cranepedia. 4 April 2020