Difference Between Magnetic Drive Pump And Canned Motor Pump

Magnetic Drive Pump

Canned Motor Pump

Magnetic drive pump has only one sealed boundary; fluid escapes into the atmosphere when it ruptures.

It has two containment zones, the can and motor housing. If can rupture, the motor housing prevents the fluid from escaping to the atmosphere.

Foundation or base required.

Foundation is not required.

There is a possibility of misalignment of motor and pump.

No problem of misalignment.

Better NPSH (net positive suction head) head.

Poor NPSH due to the warm up of liquid inside the pump.

It can use to pump fluid having a temperature upto 400°C. The magnet can tolerate higher temperatures than canned motor winding.

It cant handle high temperatures as easily as a magnetic drive.

It cannot handle higher pressure. The maximum pressure is limited by can thickness.

It can handle high pressure. The maximum pressure limit is independent of can thickness.

Not suitable for a high viscous fluid.

Since fluid gets warmed inside the motor section, higher viscous fluid can be pumped.

Noise level is higher due to the fan of a standard motor as prime mover.

Quiet operation since there is no separate prime mover.

No need for special instrumentation to determine the direction of rotation.

Can not see the direction of rotation, special instrumentation is needed.

The containment shell is five times thicker than the canned motor.

Containment can is thin.

There is a severe problem of decoupling.

No problem of decoupling.

Cost is high, but maintenance cost is low.

Cost is low, but the maintenance cost is high.