AFRICA | REGIONAL REPORT
are for the filter building and the plant workshop; one of the machines has dust- ignition-proof rating to ATEX Zone 21/22 standard. Lifting capacity of the single- girder crane is five tons; the double-girder crane will lift loads up to ten tons. Control of both cranes will be by radio remote with manual pendant back-up. Two hoists accompanied delivery of
the cranes: a short-headroom hoist for the tailings filter, and a K-Series hoist for the mill feed conveyor. Both will be used for maintenance work. Condra was selected to manufacture
the machines by consulting engineers Dowding Reynard and Associates. The overhead cranes and hoists are currently being installed. Another Condra project is the
manufacture of a service and maintenance crane for a pulp dryer line at Saiccor Mill at Umkomaas on South Africa’s KwaZulu- Natal south coast. The double-girder electric overhead
travelling crane will replace an existing machine supplied some years ago by a rival European firm, and has been designed
Morris Material Handling’s steel mills crane.
to incorporate three hoists: a 25 ton main lifting unit and two 12,5-ton auxiliaries, all of them mechanically synchronised for tandem operation as well as offering individual lift.
The crane is intended to service all the machinery on the dryer line’s floor area of 80 x 25 metres, so its dimensions and capabilities are impressive. Its crane’s 25-metre span will deliver a maximum capacity of 50 tons and a lift height of 16 metres. Alternatively, the crane will lift up to 25 tons using the main hoist while, simultaneously, two independent loads of up to 12,5 tons can be managed by each auxiliary. Condra undertook the contract as a
turnkey project. Manoeuvrability on the dryer line floor is limited by in machinery already in place, making conventional access and installation impossible. Installation will therefore be done through the plant’s roof. Production will continue uninterrupted during the process. All components of the new crane, including end-carriages, 25-metre-long box girders, crabs and hoists, will be lowered through a hole in the roof for in- situ crane assembly. Three Durban-based lifting
subcontractors will work with Condra to install the crane. Yellow Dot Coatings has been appointed to open the plant’s roof, after which Lovemore Bros will rig all components and use its 550-ton mobile crane to luff them one by one above and through the roof opening, lowering them precisely into position for assembly by Natal Cranes, Condra’s Durban-based agent.
A double-girder electric overhead
travelling crane undergoing load test at Condra’s Johannesburg factory.
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