Canned Motor And Magnetically Coupled Pumps - Applications, Operations, And Maintenance In A Chemical Plant

Lecturepg. 109The environmental requirements that drive chemical producers to move more and more to the use of the “sealless” pump are described. The development of the sealless pumps in the European industrial community and their application in various chemical services is traced. More significant developments are enumerated in the areas of design and materials as applied to this complex problem. Finally, a summary of the successes and failures of the sealless pump in various services are documented. The term sealless pump applies to the canned motor pump and the magnetic drive or magnetically coupled pump. Both of these designs are discussed along with their relative merits. The sealless pump was developed specifically to totally eliminate the need for a mechanical sealing system. The mechanical seal, by its very design must, leak to survive and this feature is not acceptable in certain liquid services. The driving force behind this development was originally the handling of toxic (lethal) or pyrophoric, flammable liquids. This technology has, in recent years, found a new more formidable champion in the almost universal concern for the environment and in the governmental legislation relating to those concerns