Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)

Chemical Pumps Metallic and Nonmetallic 303
Figure 15-12B. Thrust bearing positioned with a solid ring in bore of an end
cover.
is usually done with closures. Closure lips usually point out to prevent
liquid from entering the housing especially during wash down. Closures
can be supplied with garter-type springs or leaf-type springs. The gartertype
spring is usually easier to assemble with this type of design. It is
important that the finish of the shaft be within the manufacturer's recommendation,
usually 16 RMS or less. A light film of castor oil should be
applied to the closure for ease of assembly. There should be a 30° chamfer
on the shaft for assembly of the closures over the shaft.
On the outer diameter of the closure, even though boring is correct and
stamped casement is correct, the pieces are not always completely round.
Therefore, it is recommended that some type of adhesive be put between
the outer diameter of the closure and the housing to prevent leakage.
When it is known that there is excess environmental water or vapor or
contamination, magnetic-type closures or labyrinth-type closures are
used. They can fit in place of the clipper-type of closure.