RCM ANALYSIS Pump

Pump vibrates or is noisy at all flows

2. Pump suction pipe not completely filled with liquid16. Clogged impeller37. Too close a gap between impeller vanes and volute tongue or diffuser vanes43. Transients at suction source (imbalance between pressure at surface of liquid and vapor pressure at suction flange)44. Foreign matter in impellers45. Misalignment46. Foundation insufficiently rigid47. Loose foundation bolts48. Loose pump or motor bolts49. Inadequate grouting of base plate50. Excessive piping forces and moments on pump nozzles51. Improperly mounted expansion joints52. Starting the pump without proper warm-up53. Mounting surfaces of internal fits (at wearing rings, impellers, shaft sleeves, shaft nuts, bearing housings, and so on) not perpendicular to shaft axis

54. Bent shaft55. Rotor out of balance56. Parts loose on the shaft57. Shaft running off-center because of worn bearings58. Pump running at or near critical speed59. Too long a shaft span or too small a shaft diameter60. Resonance between operating speed and natural frequency of foundation, baseplate, or piping61. Rotating part rubbing on stationary part78. Excessive axial thrust caused by excessive wear at internal clearances or, if used, failure or excessive wear of balancing drive79. Wrong grade of grease or oil80. Excessive grease or oil in rolling element bearing housings81. Lack of lubrication82. Improper installation of rolling element bearings such as damage during installation, incorrect assembly of stacked bearings, use of unmatched bearings as a pair, and so on83. Dirt getting into bearings 84. Moisture contaminating lubricant85. Excessive cooling of water-cooled bearings

*