Insufficient Discharge

Probable Cause	Possible Solutions
1. Insufficient pump speed	Check voltage and current of each motor phase
2. System head (pressure losses) too high	The static head and pressure drop of the system is greater than the total discharge head for which the pump was designed. A larger impeller and motor may be required.
3. Partial obstruction at pump suction	Impeller clogged or suction basket strainer blocked. Clean pump suction of debris.
4. Insufficient suction head (NPSH)	Cavitation may be occuring due to insufficient suction head. Increase acid level in tank which will increase suction head.
5. Air or gas entrained in liquid	Increase acid level in tank which will minimize the possibility of entrainment. The location of the pump and acid return lines may be too close resulting in gas being draw directly from the acid return into the pump suction.
6. Mechanical defects	Pump wear rings are worn or impeller has been damaged. The pump must be removed and inspected to determine if parts must be replaced.
7. Incorrect pump rotation	Check for correct rotation. The correct direction of rotation of all pumps is shown on the upper part of the ball bearing housing or driver support base.
8. Impeller diameter too small	The static head of the system is greater than the total discharge head for which the pump was designed. A larger impeller and motor may be required.

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.