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Tony Dzubay Rochester Public Utilities E & O TECHNICAL CONFERENCE Memphis, Tennessee

Converting Journal Bearings to Tilting Pad Bearings to Control Oil Whip & Vibration in a Gas Turbine. Tony Dzubay Rochester Public Utilities E & O TECHNICAL CONFERENCE Memphis, Tennessee April 20, 2005. History. RPU - SWPC 251 B-2 Built 1974, Low Hours Controls and Equipment Upgrade 2001

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Tony Dzubay Rochester Public Utilities E & O TECHNICAL CONFERENCE Memphis, Tennessee

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  1. Converting Journal Bearings to Tilting Pad Bearings to Control Oil Whip & Vibration in a Gas Turbine Tony Dzubay Rochester Public Utilities E & O TECHNICAL CONFERENCE Memphis, Tennessee April 20, 2005

  2. History • RPU - SWPC 251 B-2 • Built 1974, Low Hours • Controls and Equipment Upgrade 2001 • Dual Fuel, Simple Cycle, Peaking, Black Start, 30MW

  3. Reason for Concern • Vibration • 1st-Critical Trips • Unpredictable Online Trips • High Average • Not Seen Before • New Control/Vibration System • Bentley Nevada 3300

  4. Vibration & Exh Brg Supply Temp60 minutes, 6MW

  5. Trip Caused by Vibration30 minutes, 6MW

  6. Reasons for Vibration • Oil Whip/Whirl • Journal Bearing Design • Cold Oil • Tight Clearances

  7. Initial Attempts to Remedy • Balance Move #1 • Turbine Center Plane • Turbine Inlet Plane • Verify/Modify Vibration Trip Limits • <95% speed – Alarm 7.0mils Trip 10mils Delay 3.0sec • >95% speed – Alarm 3.5mils Trip 5.0mils Delay 3.0sec • Balance Move #2 • Generator N.E.E. • Filtered Vibration Analyses • Rotor Unbalance 0.7 mils • Oil Whip 0.5 – 3.0 mils

  8. Initial Attempts to Remedy cont’d • Check Mechanical Components • Exhaust Manifold Spring Hanger • Turbine Trunions

  9. Possible Solutions • Warmer Oil • Refurbish Original Bearings • Overhaul in 1991 Show Dimensions Acceptable • Modify Original Bearings • 160 degree to 90 degree arc of contact • Increase in Babbitt Temps • Oil Coolers had Trouble in Past • Install Tilting Pad Bearing

  10. Tilting Pad Bearing Design • Kingsbury • Four-Pad Design • Type of Pad - Pivot Point

  11. Bearing Installation • Ease of Installation • Took 10 Days • Tools Used • Roll old Bearing Out, Roll New In • Three SWPC Staff + One RPU

  12. Tilting Pad Bearing Performance60 minutes, 6MW

  13. With New Bearing Installed • Another Balance Move • Lower Bearing Drain Temps • Exhaust Bearing Much Lower • Inlet Vibration Increased • Generator N.E.E Increased • Not enough to Cause Concern • Able to Hot-Start Unit

  14. Other Benefits • Audit of Other Equipment • Need to Install New Seals Next Outage

  15. Questions

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