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MKNS Series are PFA Lined Magnetic Drive Pumps designed as per ISO 2858 Standard, excellent for pumping corrosive and toxic media such as chlorine, bromine and fluorine compounds.

MKNS Series

MKNS series Lined Magnetic Drive Pumps are designed as per ISO 2858 standard with PFA-P linings. PFA-P linings give improved corrosion resistance as compared to high alloy, expensive metals magnetic drive pumps.

PFA-P stands for Perfluoroalkoxy – Permeation Grade. PFA-P is processed in a transfer moulding operation and as a result the lining wall thicknesses can be accurately defined and reproduced. Thanks to its dense molecular structure, PFA-P has generally much lower permeation rates than PTFE with the same wall thicknesses, but it has the same chemical and thermal resistance properties. PFA-P is justifiably the material of first choice in applications with media which especially tend to permeate, such as chlorine, bromine or fluorine compounds.

If the chemical penetrates the lining, this may cause corrosion on the pressure-bearing metal body and perhaps even failure of the unit. MKNS Lined Magnetic Drive Pumps have PFA-P lining thickness to 6-9 mm, lining locked by multiple locking grooves, producing substantially longer service lives.

Magnetic Drive Pump Overviwe

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

ADVANTAGES :

1. Improved Corrosion Resistance – Outer Body in Ductile Iron give rigidity to handle pump internal pressure and nozzle loads. PFA lining provides improved corrosion resistance.
2. Lower Initial Costs – Significant factor while considering metallurgies like Hastalloy or Titanium
3. 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.
4. Enhanced Dry Running Performance – Dry running more precisely “Broken Prime” may occur for transfer or unloading services, means there is enough liquid in the pump to lubricate the Silicon Carbide Bearings which are essentially “Product Lubricated” Because the heat input is low, Dry Running could be sustained for short periods.
5. 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. The above Magnetic Drive Pump Overview with Advantages to be incorporated as a Link under MKNS Series.

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