A mag drive centrifugal pump (magnetic drive centrifugal pump) is a sealless pump that uses a magnetic coupling to transfer torque from the motor to the impeller, eliminating the need for a traditional mechanical seal. This design prevents leaks, making it ideal for handling hazardous, toxic, or expensive fluids.
Magnetic Coupling
Outer magnets (drive magnets) – Attached to the motor shaft.
Inner magnets (driven magnets) – Connected to the impeller inside the pump casing.
The pump has two sets of magnets:
When the motor spins, the magnetic field transfers rotation without physical contact.
Containment Shell
A hermetically sealed barrier (usually metal or ceramic) separates the wet and dry sides, preventing fluid leakage.
No Mechanical Seal
Since there’s no shaft penetration, leakage is impossible, reducing maintenance and contamination risks.
✔ Leak-Free Operation – Ideal for toxic, corrosive, or volatile chemicals (e.g., acids, solvents, hydrocarbons).
✔ Low Maintenance – No seals to replace, reducing downtime.
✔ Safe for Hazardous Fluids – Compliant with EPA and OSHA regulations for fugitive emissions.
✔ Energy Efficient – No friction loss from mechanical seals.
✔ Wide Material Options – Can be made from PP, PVDF, stainless steel, or Hastelloy for chemical resistance.
✖ Not for Slurries/Solids – Particles can damage the containment shell.
✖ Limited High-Temp/High-Pressure Use – Magnets may demagnetize at extreme conditions.
✖ Higher Initial Cost – More expensive than sealed pumps but saves on long-term maintenance.
Chemical Processing (acids, caustics, solvents).
Pharmaceuticals (sterile, high-purity fluids).
Semiconductor Manufacturing (ultra-pure liquids).
Oil & Gas (hydrocarbons, VOCs).
Waste Treatment (aggressive chemicals).
| Feature | Mag Drive Pump | Mechanical Seal Pump |
|---|---|---|
| Leak Risk | Zero (sealless) | Possible seal failure |
| Maintenance | Low (no seals) | High (seals wear out) |
| Solids Handling | Poor (risk of clogging) | Better (if designed for it) |
| Cost | Higher upfront | Lower initial cost |
| Efficiency | Slightly lower (eddy currents) | Higher (direct drive) |
ITT Goulds – Goulds MDX Series
Flowserve – Durco Mark III Mag Drive
Iwaki – Magnetic Drive Pumps
March Pump – TE-5.5-MD (for chemicals)
✅ Handling dangerous or expensive fluids (no leakage).
✅ In regulated industries (pharma, chemicals).
✅ Where maintenance access is difficult.
Avoid if: You need to pump slurries, high-viscosity fluids, or high-temperature liquids (>250°C can weaken magnets).
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