Excessive Power

Probable Cause	Possible Solutions
1. Pump speed too high	Check voltage and current of each motor phase
2. Total dynamic head too low	The static head and pressure drop of the system is less than the total discharge head for which the pump was designed. The impeller may need to trimmed. Large pumps (size 10 or greater) are of a design in which maximum power is absorbed at shutoff. Check the pump curve to ensure that the pump is operating at or near its design rating.
3. Liquid properties	Pump will draw more power is the specific gravity or viscosity of the liquid is higher than that for which the pump was designed. Acid may be colder than normal.
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 diameter too large	The impeller may need to be trimmed.

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


Sulphuric Acid on the Web^TM	Technical Manual	DKL Engineering, Inc.