Root Cause Analysis on a Multistage Centrifugal Pump ... - TurboLab

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242 Introduction • Two multistage barrel type pumps for each 1200 MW Unit were installed in 1986 in a large power plant. • The 11 stage centrifugal pumps were designated as Pump(s) 1A/B and Pump(s) 2A/B. All impellers were designed with 6 vanes and 8 diffuser vanes. • The pumps are driven by 600 HP four-pole induction motors (1,770 rpm or 29.5 Hz) through a gear increaser (output speed of 4,860 rpm or 81 Hz). • Rated capacity: 350 GPM and 2,516 ft of TDH • Normal capacity: 150 GPM (43% BEP).
243 Introduction Barrel Type - 11 stage Pump Outline Drawing
Page 1: 241 Root C
Page 5 and 6: 245 Background History • Three pu
Page 7 and 8: 247 Background History 2007 Failure
Page 9 and 10: 249 11 th Stage Impeller EMA Testin
Page 11 and 12: 251 Impeller Model Vibration EMA Te
Page 13 and 14: 253 Frequency (Hz) 5000 4000 3000 2
Page 15 and 16: 255 Vibration Monitoring Pump 1B Ty
Page 17 and 18: 257 [mil] [mil] Autospectrum(Signal
Page 19 and 20: 259 Experimental Modal Anal
Page 21 and 22: 261 Operating Deflection Shape •
Page 23 and 24: 263 Operating Deflection Shape Pump
Page 25 and 26: 265 Operating Deflection Shape Pump
Page 27 and 28: 267 Axi-symmetric Model and FEA Bre
Page 29 and 30: 269 Axi-symmetric Model Impeller Lo
Page 31 and 32: 271 Axi-symmetric Model FEA Results
Page 33 and 34: 273 FEA-Based Fracture Mechanics Ap
Page 39 and 40: 279 Conclusions • The root cause
Page 41 and 42: 281

Root Cause Analysis on a Multistage Centrifugal Pump ... - TurboLab

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