Sealless Magnetic Coupled Hot Oil Circulation Pumps

General DICKOW pumps of series NMWR / NMWB / NMW are sealless centrifugal pumps with magnet coupling. The static containment shell forms a closed system with hermetically sealed liquid end. The standard containment shell is a one piece deep-draw design without additional welds made of 2.4610 (Hastelloy C). Applications The leakage free pumps are designed for handling thermal oil with a temperature range from 250 to 400 °C (482 to 752 °F) without water cooling. The containment shell replaces double acting mechanical seals with external fluid reservoirs and the necessary control equipment. Max....

Bearing housing with cooling fins The transmissible power of the Cobalt Samarium coupling depends on the operating temperature of the magnets which should not exceed 250 °C (482 °F). For applying the pumps also with temperatures between 250 and 400 °C (482 and 752 °F), the bearing housing is designed as a cooling device with cast-on fins. The heat dissipation to the atmospheres keeps the temperature in the containment shell well below the system temperature in the volute casing. The magnet temperature depends on the magnet losses. The containment shell temperature with a loss of 1,1 kW is appr....

venting device volute casing, foot mounted wear ring closed impeller drain plug double sleeve bearing

containment shell protection heavy duty bearing bracket, oil lubricated containment shell rear impeller external magnets internal magnets bearing housing with cooling fins confined gaskets

NPSH-conditions / Inducer The impellers are designed to achieve low NPSH-values over the complete operating range. The magnet chamber and the volute casing are provided with separate drain connections. To improve NPSH-required conditions, additional inducers are available. Venting NMWR / NMWB / NMW-pumps are not selfventing. They must be vented with open suction valve through the venting device under consideration of the operating instructions before start-up. Balanced thrust loads The thrust loads of the closed impellers are hydraulically balanced by wear rings, balance holes, back vanes and...

Optional designs Type NMWB - close coupled design magnet coupling motor adapter Type NMW - with grease lubricated ball bearings magnet coupling bearing bracket bearings, grease lubricated

Performance range Performance curves of the individual pump sizes, also for 1750 / 3500 rpm, are available on request. Technical changes reserved. Printed in Germany. 100-02.18 S&W DICKOW PUMPEN GmbH & Co. KG P.O.Box 1254 84465 Waldkraiburg · Germany Phone: +49 8638 602-0 Fax: +49 8638 602-200 + 602-201 [email protected] / [email protected] http://www.dickow.de