Sealless pumps reduce risk of leaks
A
Michael Smith Engineers product story
Edited by the Engineeringtalk editorial team
Jul 29, 2003
The Dickow NM centrifugal pump is ideally suited to handling aggressive liquids because its magnetically coupled design eliminates the need for seals.
Toxic, explosive and other potentially dangerous liquids place tough demands on process systems and pumps, where the potential for leakages has to be kept to an absolute minimum.
In these situations magnetically coupled pumps offer important advantages over other pump types by virtue of their sealless design.
Put simply: eliminate mechanical seals and the risks of dangerous leaks through seal failure are minimised.
The Dickow NM centrifugal pump, distributed in the UK by Michael Smith Engineers, is ideally suited to handling aggressive liquids because its magnetically coupled design eliminates the need for seals.
These pumps also help to reduce costs because they do not require external fluid reservoirs and the associated control equipment used with mechanical seal systems.
The pump is designed with large internal clearances between its inner magnets and the containment shell, and this, combined with the use of wear-resistant sleeve bearings, enables the pump to handle liquids containing some solids, without any problems.
In the unlikely event of ball bearing failure on the motor or the bearing bracket, the outer magnet is designed to rub on the outer housing and not the containment shell, thereby preventing process fluid spillage.
Internal circulation within the pump is taken from behind the impeller at the discharge point, through the magnet area and the pump shaft to the balance holes on the rear of the impeller.
This system creates pressure, forcing the circulation back to the volute casing, with the net result of pressurising the magnet end and therefore preventing vaporisation of the process fluid in the magnet area.
Standard versions of the NM pump are fitted with silicone carbide sleeve bearings with a diamond coating to ensure a short-term dry-running capability.
They are extremely robust and cover capacities up to 270m3/h at differential heads up to 150m.
Standard models can be used on liquids at temperatures up to 240C, and special design models (NMW) can be used at temperatures up to 400C.
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