Magnetic Drive Pump non-metallic-pumps-overview.html::MKNS Non-metallic ISO 2858 Pump

MAGNETIC DRIVE - Overview

Magnetic Drive Pump non-metallic-pumps-overview.html

In a standard centrifugal pump, the power is delivered to the pump end either through a direct connection between the rotating element and the motor shaft or through a coupling between the pump end shaft and the motor shaft.

In these cases, the pumping chamber needs to be sealed from the outside. Traditionally, packing or some other sort of mechanical seal accomplishes this.

The principle of a magnetic drive pump is that the rotation from the motor shaft is transferred to the pump end via a magnetic coupling which eliminates the need for the shaft seal or packing.

A drive magnet is mounted to the motor shaft, which transfers the motor torque through a sealed housing to an internal driven magnet. The driven magnet is coupled directly to the impeller. This configuration is categorized as seal-less.

The following will give an idea of approximate leakage rate for various Sealing arrangements:

Gland Packing	> 1000 ppm
Single Mechanical Seal	10 - 1000 ppm
Double Mechanical Seal	< 10 ppm
Sealless	0 ppm

Lined Magnetic Drive Pump Offers Several Advantages:

	Improved Corrosion Resistance: Outer Body in Ductile Iron give rigidity to handle pump internal pressure and nozzle loads. PFA lining provides improved corrosion resistance.
	Lower Initial Costs: A significant factor while considering metallurgies like Hastalloy or Titanium.
	Zero Eddy Current Losses: Power losses due to electrical currents produced by the rotating lines of magnetic flux cutting through a stationary conductor. These power losses translate into heat which is transferred to the pumping media. In case of metal shells, these losses could range from 10-20% of magnetic drive rating. For Non-Conductive shells, this is not observed since no eddy currents are generated.
	Close Coupled Design: Outer magnet directly mounted on Motor shaft which does not require a separate pump bearing frame. This eliminates the need for coupling alignment allowing much shorter overall length.