Tony Dzubay Rochester Public Utilities E & O TECHNICAL CONFERENCE Memphis, Tennessee
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Transcript of Tony Dzubay Rochester Public Utilities E & O TECHNICAL CONFERENCE Memphis, Tennessee
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Converting Journal Bearings to Tilting Pad Bearings to
Control Oil Whip & Vibration in a Gas Turbine
Tony DzubayRochester Public Utilities
E & O TECHNICAL CONFERENCEMemphis, Tennessee
April 20, 2005
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History
• RPU - SWPC 251 B-2• Built 1974, Low Hours• Controls and Equipment Upgrade 2001• Dual Fuel, Simple Cycle, Peaking, Black
Start, 30MW
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Reason for Concern
• Vibration– 1st-Critical Trips– Unpredictable Online Trips– High Average
• Not Seen Before– New Control/Vibration System
• Bentley Nevada 3300
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Vibration & Exh Brg Supply Temp60 minutes, 6MW
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Trip Caused by Vibration30 minutes, 6MW
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Reasons for Vibration
• Oil Whip/Whirl• Journal Bearing Design• Cold Oil• Tight Clearances
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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
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Initial Attempts to Remedy cont’d
• Check Mechanical Components– Exhaust Manifold Spring Hanger– Turbine Trunions
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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
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Tilting Pad Bearing Design
• Kingsbury• Four-Pad Design• Type of Pad - Pivot Point
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Bearing Installation
• Ease of Installation• Took 10 Days• Tools Used• Roll old Bearing Out, Roll New In• Three SWPC Staff + One RPU
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Tilting Pad Bearing Performance60 minutes, 6MW
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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
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Other Benefits
• Audit of Other Equipment• Need to Install New Seals Next
Outage
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Questions