igure 10 Centrifugal Pump Components

CENTRIFUGAL PUMPS DOE-HDBK-1018/1-93 Pumps Some wear or erosion will occur at the point where the impeller and the pump casing Figure 10 Centrifugal Pump Components nearly come into contact. This wear is due to the erosion caused by liquid leaking through this tight clearance and other causes. As wear occurs, the clearances become larger and the rate of leakage increases. Eventually, the leakage could become unacceptably large and maintenance would be required on the pump. To minimize the cost of pump maintenance, many centrifugal pumps are designed with wearing rings. Wearing rings are replaceable rings that are attached to the impeller and/or the pump casing to allow a small running clearance between the impeller and the pump casing without causing wear of the actual impeller or pump casing material. These wearing rings are designed to be replaced periodically during the life of a pump and prevent the more costly replacement of the impeller or the casing. ME-03 Rev. 0 Page 8