Condra builds superspan maintenance crane for platinum concentrator
Condra has completed a customised double-girder electric overhead travelling crane with an unusual design for a platinum concentrator.
The unusual crane, which weighs 33.3 t and has a lifting height of 18.7 m, boasts a wide span of no less than 35 m – more than double the average of 15 m and nearly reaching the manufacturer's record span of 42 m.
Condra completed the final assembly, alignment and testing of the concentrator maintenance crane during the last week of March, using 260 m2 of factory floor space, with the crane set to be delivered to the platinum concentrator for maintenance duty.
Controlled remotely by radio, the crane also has box girders the height of an average man and a 20 t two-speed hoist mounted on a 7-m-wide crab with a 6 m wheel base.
A working platform of open-grid walkway and solid-forge handrail runs the full length of the machine.
The very wide-span crane is fitted with the company’s patented storm brake to counter the excessive wind forces expected at the installation site.
“The storm brake is activated by anemometers in two stages, the first sounding a siren when the wind speed reaches 30 km/h and the second automatically engaging the brake at a wind speed of 50 km/h,” a Condra spokesperson says. At this point, any crane operation is deactivated and the machine automatically secured against all movement.
Three specialised vehicles will be required to transport the crane to the site, namely two horse-and-dolly movers for the two box- girders and one flat-bed trailer to be loaded with the hoist, crab, end-carriages, bottom-block, panels and ancillary equipment.
Installation and commissioning at the concentrator will be undertaken by an independent contractor supported by Condra engineers.
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