Pump Vibration Troubleshooting

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Axially Split Case Dbl. Suction Pump

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• 180 degree “drip pocket” allows bearing hsg and stuffing box to flex downward due to pressure pulsations, e.g. at 1x or vane pass

• Double suction impeller typically equalizes thrust side-to-side, but at off-design is prone to axial shuttling

• Suction recirc & cav have been issues

Boiler Feedwater Ring-Section Pumps

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• 180 Less robust than barrel pump, but fewer Fn problems. 

• Designs where thrust disk Totally replaces oil lubricated thrust bearing have encountered rub and binding problems during process upsets

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