GGB's Bearings Tested for Extended Service in Brazil's Belo Monte Hydro Project
Conducted by Powertech Labs in accordance with U.S. Army Corps of Engineers specifications, testing simulated actual operating conditions at Belo Monte, including the use of water from the Xingu River where it is being constructed. The bearings were subjected to tests that were modified to simulate 30 years of operation rather than the standard 8 years.
The bearings, which consist of a fiberglass-reinforced, epoxy resin support layer and a sliding layer of polyester fibers with PTFE and other additives, were first subjected to a static load with rotary and oscillating motion under both dry and wet conditions. They then underwent accelerated wear testing with a dynamic radial load on a journal moving continuously +/- 1°. The static load remained constant, but the dynamic load was paused every 15 minutes to simulate a turbine wicket gate opening +/- 15°.
The bearings performed well with little evidence of operating stress. Significantly it was demonstrated that their coefficient of friction and wear rate decrease as running time increases. This data is used by engineers specifying self-lubricating bearings for prolonged service and maintenance-free operation in hydropower turbines.
For more information contact Yves Flávo Silva at yves.silva@ggbearings.com.
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