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There should be no more axial movement allowed with a flexible coupling than there would be with a rigid coupling. In either case the shaft is restrained axially by ball bearings (motor bearings or pump bearings). In my experience motor manufacturers tend to leave more axial float (axial clearance) in their ball bearing arrangements than do pump manufacturers. If this is the case, then you will get less axial movement with the flexible coupling with the pump shaft supported on its own bearings. You describe this as a steam condensate pump. Most of the ones we have are vertical turbine pumps rather than vertical in-line. This affects some of my earlier comments. A vertical turbine pump will have a line shaft down to the impellers in the bottom of the "can" and thus will have support bushings even if it has the flexible coupling configuration. My concerns about radial movement (shaft deflection) are not valid in this case. The shaft will have the same opportunity for radial displacement regardless of the choice of coupling arrangements.
Johnny Pellin