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Turbine drive train overhauled in just six weeks

August 2019 News

In a recent major overhaul of a 70 MVA turbine generator set, Marthinusen & Coutts took responsibility for the entire drive train refurbishment. Working in collaboration with business unit Actom Turbo Machines, the company completed the work successfully within six weeks for the electrical generation plant at Metalloys’ manganese plant in Meyerton, Gauteng.

According to Mike Chamberlain, Marthinusen & Coutts’ marketing executive, this achievement showcased the capacity of the divisions to take full control of large mechanical and electrical refurbishments. Chamberlain highlights that the customer did not want to split the responsibility for the complete generator and turbine drive train between separate contractors.

“Marthinusen & Coutts and Actom Turbo Machines’ capabilities enable us to control the entire process, offering peace of mind to customers, coupled with optimised cost efficiencies,” says Chamberlain. “This also reduces customers’ risk and managerial effort in dealing with multiple suppliers.”

The scope included a complete inspection of the turbine rotor and internal components, as well as runout and dimensional inspection on the rotor. Inspections incorporated glass bead blasting and non-destructive testing of many components.

High-speed balancing of the 13 tonne rotor was conducted, and turbine rotor journals were repaired. White metal bearings were relined, and the thrust bearing was modified to improve fitment in the bearing casing. Positive material identification tests were conducted on all the studs, nuts and shaft seals. A complete 3D scan was done of the centreline to allow reverse engineering drawings.

At its repair facility in Cleveland, Johannesburg, Marthinusen & Coutts also performed a number of inspections, tests and repairs on the rotor. Dimensional inspections and electrical tests were conducted, as well as non-destructive testing such as the phase array test. Slip rings were ground, the diode wheel was inspected, and the diodes were tested.

For more information contact Marthinusen & Coutts, +27 11 607 1700, support@mandc.co.za, www.mandc.co.za





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