Heavy-lift cranes don鈥檛 get much bigger than the SGC range of ring-mounted cranes from Belgian lifting specialist Sarens. The latest model to join the range 鈥� the SGC-90, nicknamed听Little Celeste听鈥� can lift a maximum load of 1,650 tonnes. And not only is the new crane powered by electricity, but it can also regenerate its own electrical power.
Despite its impressive dimensions,听Little Celeste听is aptly-named being the smallest machine in the SGC (Sarens Giant Crane) range. It is the little sister of听Big Karl, the 5,000-tonne-capacity SGC-250 that is claimed to be the world鈥檚 most powerful land-based crane.听Big Karl听is currently working on the Hinkley Point C power station project in Somerset.
While all of Sarens鈥� other SGCs are regular diesel-powered hydraulic听cranes, the SGC-90 is designed for connection to the electric grid. All of its functions are electric; no diesel, no hydraulics. It can even produce its own energy, recovering and reusing some of the electricity it uses for lifting, each time it lowers a load. When connected to the mains electricity network,听Little Celeste听recovers energy and feeds it back, reducing energy consumption by up to 40%, according to Sarens.
Because it runs on electricity, the SGC-90 in operation is much quieter than a comparable diesel-powered machine. There are also no exhaust emissions and there is no risk of oil contamination. And with no hydraulic听pumps, filters or engines, maintenance requirements are significantly lower.
The听crane鈥檚 ring diameter is 35m, maximum counterweight is 2,700 tonnes and maximum load moment is 99,000 tonne-metres. It can be configured in a variety of ways, with main boom lengths of 100, 120 and 130m. The Sarens heavy duty and light jib can also be used to reach further or attain a higher hook height.
Sarens says that it already has a project lined up for the new听crane听before the end of the year but did not disclose the location.
No sooner had Sarens unveiled the all-electric SGC-90 than German crane manufacturer Liebherr announced the development of its own debut electric models which it claims are the world鈥檚 first full-sized battery-powered crawler cranes.
Liebherr听says that the LR 1200.1 Unplugged and LR 1250.1 Unplugged have maximum rated lifting capacities of 200 tonnes and 250 tonnes respectively. In fact, they have exactly the same performance specification and load charts as the existing diesel-powered versions of the same machines. The only difference is that these models are driven by 255kW electric motors instead of diesel engines.
Laing O鈥橰ourke鈥檚 plant division, Select听Plant, has already ordered an LR 1250.1 Unplugged (which Select is calling the LR 1250e) with delivery expected in February or March 2021. The crane will be the first of this series in the UK and only the second in the world.
The cranes can be recharged on a conventional site electric supply (32A or 63A) in four and a half hours and optionally with 125A in two hours 15 minutes. The capacity of the battery is designed for four hours of lifting operation. Unlike Sarens鈥� new SGC-90, the Liebherr cranes听can be operated without a power cable, hence the 鈥渦nplugged鈥� suffix thanks to the battery-electric drive design.
There are several electrically-powered mini crawler听cranes听on the market, from manufacturers such as Unic, Jekko and Meada, but these can only lift up to about five tonnes. Nothing of this size, and nothing with a lattice boom, has been available in battery power before.
The LR 1200.1 Unplugged and LR 1250.1 Unplugged are produced in Austria by听Liebherr-Werk Nenzing, which also makes a battery-powered drilling rig.
鈥淭he year 2020 has shown that one must be open-minded and bold to break new ground,鈥� says Gerhard Frainer, managing director for sales at听Liebherr-Werk Nenzing. 鈥淲ith our unplugged听cranes听we offer our customers an alternative drive design. As we have already seen with the LB 16 Unplugged, the first battery-powered drilling rig, the strategy is a complete success.听
鈥淪trict requirements regarding environmental sustainability in tenders for construction projects increase the demand for advanced technologies,鈥� adds Frainer. 鈥淔or us, it was clear that we extend and successfully establish the design in further product groups.鈥�
Such is the interest in听Liebherr鈥檚 latest innovation that the video released for its launch received more than 25,000 views in its first 14 hours.
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