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Local assembly of MACC drives aims to slash lead times

Home Engineering Mechanical – Gears & Gearboxes Local assembly of MACC drives aims to slash lead times

SEW-Eurodrive’s expanded local capability out of its new Aeroton facility will include the assembly of SEW modular air-cooled condenser (MACC) drives for delivery at a rate of three units per week, slashing current lead times from overseas OEMs by approximately 36 weeks.

That’s according to Jonathan McKey SEW-Eurodrive’s National and Africa Manager for Business Development, who said the the MACC is a purpose designed gearbox solution for driving the modern fan-based air-cooled condenser (ACC) systems used in steam-driven power generation plants.

“The first SEW-MACC drives were installed in the Northern Cape. This was followed by a further 24 units, which have now been installed at a utility station in Limpopo – and these Size 09 MACC drives are the largest ever built by SEW-Eurodrive,” McKey said.

The units were assembled in SEW-Eurodrive’s factory in Nelspruit, but a new assembly line is now being built in Johannesburg to take production capacity to the next level.

“An ACC fan works in the same way as any cooling fan, but in power stations and industrial condensing systems, they need to generate huge air flows to efficiently condense exhaust steam from turbines. Our M-Series… drives adopt a modular design concept and gearing technology with specific optimisations to make them better suited to these applications.”

McKey said a stiffer case with built-in cooling veins has been developed for improved cooling. “Our internal EBD (extended bearing distance) system has also been incorporated, which better enables the gearbox bearings to accommodate the very high axial and radial forces transferred through the fan and the drive shaft.”

He said an optional dry-well is also included to better prevent oil leakage at the output shaft, while still allowing standard mounting dynamics to be used.

With the EBD and the stiffer casing, SEW’s MACCs offer larger service factors, can handle higher loads and the whole drive train is stronger and more robust.

“We have also built-in a maintenance brake so that when servicing is required, wind from the outside can be prevented from turning the fan and the main shaft, improving safety risks and making the boxes easier to maintain in-situ.”

Compelling

These, he said, are compelling reasons for power stations to replace faulty ACCs with SEW-Eurodrive MACCs. “To make this easier for plant operators, we build customised adapter plates to enable our design to be easily retrofitted as a direct replacement for any older-generation boxes currently in use.

“We also customise the output shaft length to perfectly match the ACC infrastructure onsite and to establish the ideal fan position for maximum efficiency.”

He said a single casing with key ratios will be able to accommodate all of the different ACC requirements of South Africa’s Power Stations. “Our stocking policy is very simple. We will stock a single casing size with multiple components and specific ratios depending on which power station requires the drive.”

This modular approach, he added, will enable the new facility to custom-assemble SEW MACCs to suit any local power station at a rate of two to three units per week.

“We have already ordered the components for the 30 units we intend to hold in stock, and we expect to be assembling units here by September 2022. Current typical lead times from overseas OEMs is around 36 weeks, no matter how many boxes are being ordered. Our new local assembly capability gives South and Southern African clients massively reduced lead times for replacement ACC drives.”

Commenting on service and repairs, McKey said, “We are already up and running, both here and in Nelspruit. Our new assembly line equipment and test bench is on its way, and these precisely replicate SEW-Eurodrive’s assembly and testing capability in Finland”.

He said this was part of the company’s “mission to localise our modular drive concept for a variety of industrial drive applications… to best meet local needs and conditions and massively reduce lead times. Local assembly is key to achieving this and, going forward, we hope to be closing the local supply and service loop for all users of our drives”.

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