Teikoku USA Inc and the Chempump Division offer both internally- and externally-circulated canned motor pumps supplied based on specific pumping application requirements. Both circulation paths offer unique benefits.
Canned motor pumps with internal circulation are commonly used for standard transfer applications, when pumping a fluid with a high melt point and the entire pump can be equipped for heat tracing, or with highly toxic or lethal fluids to eliminate the potential leak paths created by an external circulation line and fittings.
Canned motor pumps with external circulation are equipped with a connection off the discharge of the pump casing going to either the rear bearing housing or pump casing adapter. The advantage of an external-circulated pump is that the fluid in the recirculation line can be filtered, cooled, and monitored. It is common to place a self-cleaning filter in the discharge flange of the pump to eliminate any particles from coming in contact with the bearings. Heat exchangers can be used to cool the fluid prior to it entering the motor. Flow and pressure detectors can be installed on the circulation line to monitor the condition of the pump.
Split Internal Flow
Combines the advantages of both Internal & External Circulation in one pump design