RING CRANES Ӏ MATTHIAS SARENS INTERVIEW
With the SGC-170 (left) Sarens is
well-prepared for ‘electric-only’ heavy lifting project tenders
of 30 years. Parts can be swapped if necessary but aside from minor components this is not likely.
Does the modularity of the crane aid with assembly and disassembly times? What are the quickest assembly and disassembly times you’ve achieved so far? Yes, because we can limit the configuration of the crane to the necessary components for the specific job. We have only assembled the crane once and this is not representative as the components arrived gradually on site. We estimate, however, that in the minimal configuration an assembly/ disassembly time of four weeks is possible.
In terms of physical space how much area is required for setup and disassembly? This is largely dependent on the configuration of the crane: a longer main boom with jib requires more site space. Also, site organisation, auxiliary cranes etc. will have a big influence. For the configuration with all 120 metres of main boom it would be approximately 10,000m2 – but this is only a ballpark figure.
And how much operating space does the crane require once in use? The outer diameter of the ring is 48 metres; with an extra safety zone of one metre, a circle with a diameter of 50 metres is sufficient for the crane to operate.
Why did you decide to make the SGC-170 fully electric and how did you go about designing a crane that can lift such huge loads using grid power alone? The electrical powertrain has many advantages over the conventional, hydraulic system: lower costs, less maintenance, no oil leakage or spillage, and a higher efficiency. Several drivetrain components
were released to the market during the development of the crane, emphasising that very recent advanced technology is used, like the synchronous permanent magnet motors with reluctance used on the winches.
38 CRANES TODAY
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