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The U.S. Army Corps of Engineers (USACE) has approved GGB Bearing Technology’s new HPMB™ filament-wound bearings for use in hydropower turbine wicket gates. The approval is based on simulation testing performed by Powertech Labs.
Conducted in April 2015 in accordance with USACE specifications, the
testing simulated the operating conditions of a wicket gate in a Francis
turbine. Test results showed an extremely low stick-slip effect,
indicating smooth operation of the regulating mechanism in a turbine, as
well as a low wear rate with no visible bearing damage in wet, dry, or
According to the test report, “The dynamic and static coefficients of
friction were quite close to each other, which indicates a smooth end
of stroke direction reversal. The test ran smoothly and quietly and the
coefficients of friction remained stable for the duration of the test.
Overall the bearing was in excellent condition…the wear rate was
HPMB™ features a machinable liner that provides tight dimensional
control and tribological properties for hydropower applications.
Post-installation ID machining allows IT7 diametrical tolerance to be
achieved with improved concentricity and cylindricity. Liners can be
machined with commercially available inserts.