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Centrifugal Pumps

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Figure 1.8: Typical ANSI pump casing/cover

the discharge column. Further details on vertical pumps will be found
in Section 9.2.

1.3.2 Back cover arrangements
One of the major differences between the ANSI and API pump casings
is in the manner in which the back cover is secured to the casing.
In the ANSI design shown in Figure 1.8, the back cover and gasket are
held against the pump casing by the bearing frame adaptor, which is
most frequently supplied in cast iron. This usually results in a gap

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Figure 1.9: Typical API pump casing/cover