Vibration - Pump TS

Probable Cause	Possible Solutions
1. Misalignment between pump and driver	Check pump and driver alignment.
2. Warn bearings in driver	Inspect motor bearings and replace if required.
3. Structural integrity of pump mounting nozzle or pump tank may lack rigidity	Check for excessive corrosion of the pump tank roof, structural steel and pump mounting nozzle. Repair as require. Additional structural support/stiffening may be required.
4. Mechanical defects	The pump shaft may be bent. Rotating elements may be binding. The packing may be too tight. Bearings may be faulty. Take the pump out of service and inspect.
5. Impeller partially clogged	A partially clogged impeller will cause and imbalance at the pump suction resulting in excessive vibration.
6. Excessive flow	The static head or pressure drop of the system is lower than the total discharge head for which the pump was designed. For large pumps (size 10 or greater) vibration may result from operation at flows lower than nameplate rating.
7. Cavitation	Cavitation is the result of insufficient suction head to the pump. The causes of cavitation are low liquid level, excessive turbulence at pump suction and/or entrainment of gases into the pump suction.

Any difficulties in operation which are not covered by these general instructions should be taken up with the Chas S. Lewis & Co., Inc.

Contact:    Chas S. Lewis & Co., Inc.
                8625 Grant Road
                St. Louis, Missouri
                USA   63123

Telephone: (314) 843 4437
Fax: (314) 843 7964


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