August 2008

Special Report: Fluid Flow and Rotating Equipment

Canned motor pumps make important inroads in refinery service

Difficult applications drive increased use

Fegan, S. D., Hermetic Pumps, Inc.

Magnetic drive and canned motor pumps have had relatively low acceptance rates in refineries, especially in the US, even though thousands of these units are successfully operating in hydrocarbon services around the world. The importance of these pumps is well recognized in the efforts of the American Petroleum Institute (API). A working committee was formed in 1990 to compile data for a document covering sealless pumps in refinery services. The resulting standard (API-685) was formally adopted in 2000 and a revision to this standard is due for publication in 2008. Initially slow acceptance overcome. In a typical canned motor pump (Fig. 1) the motor rotor shares its shaft with the pump impel

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