DESIGN IDEAS
HYBRID CONTAINMENT SHELL BOOSTS TEMPERATURE AND PRESSURE PERFORMANCE OF MAGNETICALLY DRIVEN PUMPS
generates eddy currents that in turn generate heat. The amount of heat generated depends on thematerial of the barrier. Hastelloy C and titaniumgenerate less eddy current than stainless steel,while non-metallicmaterials generateminimal losses. Also, the strength of amagnetic field
Rear containment shell (inset) improves energy efficiency of magnetically driven pumps
The significant benefits of themagnetically driven pumpsmanufactured byMPumps in the process and chemical industries derive fromits hermetically sealed designwith no rotating seals to fail. Thismeans zero leakage, no cross-contamination of the pumped liquid, nowastage, no environmental hazards and improved operator safety,with longer service intervals. Thanks to their leak-free design,MPumps
are particularly suited to handling toxic, flammable or other dangerous liquids. Models are available for handling capacities up to 4,000m3
/hr, differential heads up to
220m(single stage) and up to 700m(multi- stage),with systempressures up to 150bar. Demands fromend-users include handling
higher pressures and higher temperatures with improved energy efficiency. In response to these demands,MPumps has
8 /// Environmental Engineering /// April 2017 developed an innovative rear containment shell,which is nowfitted
to the CNMAG-MSeries of centrifugal process pumps. This patented hybrid containment shell
combines the reliability and chemical resistance of a standard innermetallic shell with the strength of a carbon fibre outer shell. It is suitable for applicationswith liquids at temperatures up to 200ºC and systempressures up to 50bar.With an inner shellmade of either titaniumor the nickel alloy Hastelloy C, theMPump Hybrid Containment Shell enhances the operational efficiency and competitiveness of these pumps, compared to standardmag-drive pumps. The operating principle ofmag-drive
pumps involves a rotatingmagnetic field which is separated by a stationarymetallic barrierwhich cuts themagnetic field and
reduces in proportion to the square of the distance fromit, so the closer themagnets are together, themore efficient the coupling. TheMPumps hybrid design minimisesmagnetic losses by featuring a very thin barrier (in either Hastelloy or titanium),with a thin carbon outer shell, thereby reducing the amount of heat from eddy currents and the distance between the rotatingmagnets. Consequently for a given duty,MPumps
hybrid technologywill consume less power in operation, in turn enabling a smaller motor to be installed, compared to a pump with a traditional containment shell. In addition to the benefits of improved
energy-efficiency and amore compact design, CNMAG-Mpumps retain the important advantages ofmag-drive pumps. Close coupled versions are also available which reduce possible alignment issues and minimise on-site space requirements. Furthermore, a choice of chemically resistant wettedmaterials helps to extend pump life and increase time between servicing. For critical applications, secondary containment options are available. TheMPumps range is available in the UK
fromMichael Smith Engineers. The range includesmagnetically coupled centrifugal, vane, turbine and side-channel options.
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