Huisman celebrate project to build 10,000t cranes for Heerema
21 July 2015 by Will NorthHuisman has held a ceremony at its facility in China, where it is to build two 10,000t cranes for a Heerema semi-submersible crane vessel.
The two tub-mounted cranes are, Huisman says, the world's largest. The new vessel, known as the NSCV or New Semi-submersible Crane Vessel, will be Heerema's main construction vessel for the next 30 years.
Each crane will be capable of lifting 10,000y in revolving mode, which qualifies as the largest offshore crane in the world. The crane boom will have a length of 145m and with the boom up, the crane will reach a height of 210m above the waterline. The NSCV will have a length of 214m and a width of 97.5m, making it the largest crane vessel in the world. The NSCV will be self-propelled with a transit speed of 10 knots.
Unlike traditional tub cranes which make use of either bogies or large wheels for their slew system, the new cranes will make use of large bearings of Huisman's own design, which are manufactured in-house. One of the largest benefits of a bearing is that this allows for a substantial weight saving on the crane, an important feature for semi-submersibles. The slew bearings of these cranes will have a diameter of 30m. The two cranes will each be able to lift 10,000mt at 48m radius in offshore conditions.
