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MAG drive for peace of mind pumping
Reliability and safety are of paramount importance for pumping operations, especially those in the chemical and process industries that require the safe transfer of corrosive, toxic or expensive liquids. To meet these demands SPX Process Equipment has added a new model to their Johnson pump range: the seal-less, leak-proof TopGear MAG.
As the name may suggest, TopGear MAG internal gear pumps are magnetically driven; so they are seal-less by design and specifically developed for handling low or high viscosity hazardous or toxic liquids, or for liquids that are problematic to seal-off.
The pumps provide a maximum capacity of 80m3/h, a maximum differential pressure of 16 bar and can operate on liquids with a maximum temperature of 250°C.
Total containment is achieved using a hermetically sealed can, which effectively isolates the liquid from the surrounding environment. This eliminates the need for shaft seals and the associated wear and leakage that would normally occur. The MAG drive ensures a clean, safe and leak-free operation, which is important for safe and reliable pumping of aggressive liquids.
An important feature of the pump is the large gap between the inner magnet and can, which minimises friction losses when pumping high viscosity substances. TopGear MAG pumps are available with silicone carbide bearings; materials that are extremely wear resistant and enable efficient handling of low viscosity media. Also, a built-in safety system is incorporated into the pump which prevents both the inner and outer magnetic rotors from running against the can in case of bearing failure.
Thanks to the use of highly chemically resistant Hastelloy C4 can material between the magnets, eddy current losses are reduced to a minimum whilst also increasing pumping efficiency and minimising the pump’s operating temperature. Simple inspection and maintenance is enabled by the back and front pull out design.
The TopGear MAG, which is designed for complete interchangeability with the existing TopGear range of pumps (GM and H models), is also available with options such as heating and cooling jackets, which safeguard the pump in start-up and shut-down processes. Steam or thermal oil options are also available.
Typical applications include pumping a wide range of hazardous or toxic liquids like phenol, solvents, isocyanates, sodium hydroxide, epoxy resin, fuel additives, caustic solutions, oils, bitumen and alcohols.