Wicket Gate Bushings Grease vs Greaseless Greaseless Bushing

Wicket Gate Bushings Grease vs. Greaseless

Greaseless Bushing Applications 1. Linkage bushings 2. Bearing 3. Wear pads 4. Wicket gate bushings 5. Wicket gate bushings 6. Packing wear strips 7. Wicket gate bushings 1. Bearing 2. Linkage bushings 3. Wicket gate bushings 4. Wicket gate bushings 5. Wear pads 6. Trunnion bushings 7. Trunnion bushings 8. Wicket gate bushings

Types of Greaseless Bushings ØMetallic ØNon-metallic

Experience & Problems Delamination Plug swell MAIN PROBLEMS: Stalling and Stiction (stick-slipping)

Why?

Why? Threshold Chatter Vibration

Servomotor Pressure Monitor DISPLAY • Realtime pressure (5 sec. update) • Max. pressure in last 24 hour period • Graph of max. pressure per day for last 365 days. Data storage • Graph of max. head per day for last 365 days. a 0 m 4 -2 Wide area network View data at office or any location on WAN Rosemounted on wheel pit wall and connected to wicket gate servomotors’ existing taps in most units or in governor cabinet of some units. Rosemount Differential pressure transmitter

X-Y, Gate - Pressure Chart (Wet) AFTER

X-Y, Gate - Pressure Chart (dry) LARGE KAPLAN UNIT 400 300 Differential Pressure 200 100 Before After 0 -10 10 30 50 -100 -200 -300 -400 % Gate 70 90 110

Future of Greaseless Options to consider: ØGreaseless materials Ø“Green” grease and bronze* ØStandard greased bronze* *Hybrid: install greased bronze for stem bushings and pads, use greaseless for linkages.

Things to Consider for greaseless installation: ØForce – servomotors ØFriction – coeff. of friction & head ØFatigue – will the material last?

APPENDIX OTHER CHARTS OF INTEREST

X-Y, Gate - Pressure Chart (Dry)

X-Y, Gate - Pressure Chart (Wet)