Magnetic drive pump: great advantages and special applications
How does a magnetic drive pump work?
On the magnetic drive pump it is not the shaft that directly drag the impeller, but it’s the two permanent magnets, one internal and the other one external, which are moved by the magnetical interaction between themselves. The isolation shell is placed in the free space between the magnets. Since shaft and impeller are not in contact, any leak of liquid is avoided.
That one is the main characteristic that differentiate the magnetic drive centrifugal pump from the mechanical seal one.
That kind of technology offers undeniable advantages.First of all, the environment is safe from leak of fluid, especially if it’s toxic, corrosive, flammable or dangerous. Magnetic drive is recommended for special applications for very high or very low temperature, from – 100° a + 300° Celsius. This guarantees high safety standards, including Atex area.
A magnetic drive pump is recommended to pump high value fluids. Indeed, being completely leak free, money loss is avoided. The magnetic pump doesn’t mount a mechanical seal, that’s why the cost of maintenance is considerably lower. The mechanical seal, indeed, needs to get recursive maintenance or eventually to be replaced. A mechanical seal needs an external flushing and a barrel, but a magnetic drive pump doesn’t, and that save economical resources.
In order to avoid negative consequences due to dry run, it is possible to mount Runsafe Sic bushes.It is also possible to mount sensors on suction, in order to get a signal in case of dry run and stop pumping. As an alternative, on metallic pumps, a PT100 can be installed to monitor the temperature on the isolation shell.