Product category:
Pumps, Vacuum pumps
News Release from: Michael Smith Engineers | Subject: Dickow NM centrifugal pump
Edited by the Processingtalk Editorial
Team on 28 July 2003
Sealless pump minimises risks of
dangerous leaks
Toxic, explosive and other potentially dangerous liquids place tough demands on process systems and pumps, where the potential for leakages has to kept to an absolute minimum
Toxic, explosive and other potentially dangerous liquids place tough demands on process systems and pumps, where the potential for leakages has to kept to an absolute minimum In these situations magnetically coupled pumps offer important advantages over other pump types by virtue of their sealless design
This article was originally published on Processingtalk on 26 Aug 2008 at 8.00am (UK)
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Quite 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 it's 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 270cubic metres per hr at differential heads up to 150m.
Standard models can be used on liquids at temperatures up to 240C, while special design models (NMW) can be used at temperatures up to 400C.
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