Conventional Centrifugal Pumps with Double Mechanical Seals.

• Separate motor and coupling required. These are susceptible to environmental deterioration.
• Double mechanical seals wear out and call for replacement time to time. Seals and buffer fluid systems to be monitored continuously. Periodical maintenance and downtime are unavoidable.
• Coupling misalignment may lead to seal and bearing failures.
• No provision for secondary containment in case of fluid leakage. Leakages can prove expensive, hazardous or catastrophic.
• Multiple bearings and gaskets cause frequent maintenance.

Magnetically Driven Pumps

• Separate motor and coupling susceptible to environmental deterioration. Coupling misalignment may lead to total system failure.
• No secondary leak containment. Leakages into atmosphere cannot be avoided on pump failure.
• Single containment shell vulnerable to rubbing and gall through both internal and external magnets. When containment shell ruptures outer magnet can be flung away.
• Magnet slip can cause severe vibration and mechanical damage on every part.
• The pumps have pressure limitations.
• External lubrication is required.
• No arrangement for detection of bearing wear.
• Large base plate and rigid foundation required.
• Large, heavy base plate and rigid foundation required to dampen vibrations which may cause seal and bearing failure.
• Large space requirement to accommodate pump and the auxiliary system, piping etc.
• For field repair, almost all the pump parts including the driven magnet must be kept in stock. The magnet may be demagnetized while in warehouse.
• Virtually impossible to disassemble and/or reassemble the drive and driven magnets at site, or even in a plant repair shop. Special tools and skills are needed for maintenance.
• Strong magnetic field influence other instruments nearby either at installation site or in the ware house.