Sarens has introduced an electric version of its SGC heavy lift ring cranes in the form of the 99,000 tonne/metre SGC-90 with a maximum capacity of 1,650 tonnes.
The new crane sits on a 35 metre diameter ring, with a maximum counterweight of 2,700 tonnes. It can be configured with main boom lengths of 100, 120, and 130 metres and a 200 tonne capacity 27.5 metre jib. Sarens' heavy duty and light duty jibs from its existing SGC-120 heavy lift crane can also be used to achieve a greater hook heights.
The big difference with the new model is that all of the hydraulic drive motors - which power the hoists and slew bogies - have been replaced with electric motors. The idea is that the crane is wired into a main power source in the same way as some big mining shovels/draglines, port cranes or tower cranes. Where a mains electric source is not available the crane can of course use diesel powered generators, although that defeats the purpose. However the electric drive motors are likely to be a great deal smoother and more efficient than the hydraulic alternatives, while eliminating oil usage and the potential for leaks.
Sarens claims when working on mains power energy consumption is 40 percent lower than for a diesel hydraulic version, while dramatically reducing maintenance parts usage. The crane also generates power when lowering the boom or hook and can input that power into the national grid.
As with all Sarens SGC models, the crane was fully developed in house, with fabrications made by sub-contractors. The new crane has been given the name ‘Little Celeste’. The following detail shows further detail: