Leak-free for hot oil
September 1st 2006

A magnetically coupled centrifugal pump from Michael Smith Engineers offers sealless design combined with a hermetically sealed liquid end to give zero leakage.

The magnetically-driven Dickow NMW Series is suitable for hot oil and other similarly challenging applications, without the need for external cooling.

Should a leak of hot oil occur at high temperature as a result of pump failure, it is likely to react with the atmosphere, turning it into coke or tar. If the vapour pressure at operating temperature is above the atmospheric pressure, the leak will vaporise. To protect against this risk, conventional pumps usually have double mechanical seals.

Dickow NMW pumps include a containment shell that is said to ensure a hermetically sealed liquid end, without the need for mechanical seals. The shell is designed as a pressure vessel to separate the pumped liquid from the atmosphere only and is not used as an additional bearing holder, so no dynamic stresses occur.

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