Centrifugal pumps and magnetic drive pumps for different industrial applications

The family of industrial pumps usually includes API, ANSI and ISO models. On the other hand, magnetic driven pumps are designed for services where leakages cannot be tolerated. Complete understanding of processing involved is the key in finding best pump solution to each particular pumping problem.

Magnet drive pumps (also known as magneticallycoupled pumps) vary from the traditional pumping style, as the electric motor is coupled to the pump by magnetic means rather than by a direct mechanical shaft. The pump works via a drive magnet, ‘driving’ the pump rotor, this eliminates any shaft sealing required by the pump. if the load of the pump is too great. By the magnetic coupling ‘breaking’, it means the pump does not overload and get damaged. Eliminating the drive seals gets rid of leaks, friction loss, wear and noise. It provides complete separation of liquid from the pump drive, and nearly 100 percent transfer of motor power into pumping power.

Liquids containing ferrous particles are problematic when a magnetic drive pump is used. This is due to the particles collecting on the impeller magnet, and over time causing the pump to stop working. Some energy is lost in the coupling. This is primarily due to some magnetic resistance; this is not a significant factor in many pumping applications.

The recirculation flow (a flow form pumped liquid) for any magnet drive pump has three basic functions; these are: • Removal of the heat generated from magnetic losses. • Lubrication of the internal radial and thrust bearings. • Thrust balancing of the free floating rotating assembly.