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The Practical Pumping Handbook ....... - ---~- 7---_ .......... J

Figure 1.5: Vertical inline pump (Reproduced by
permission of Goulds Pumps, ITl Industries) Figure 1.6: Diffuser casing

1.3.1 Diffuser casings
Another design style incorporates
a circular casing with a diffuser
which has the interior passages
needed to transfer the velocity
energy to the pressure energy
prior to discharge from the casing.
In this design, the impeller runs
concentrically within the diffuser
and the casing. This arrangement
is used extensively in multistage
pump designs in both vertical and
horizontal configurations.
Diffuser vanes arc used in a
slightly different arrangement, yet
with the same purpose, in a
vertical turbine pump. Where the
impeller discharges into the bowl
assembly casing, the diffuser vanes Figure 1.7: Vertical turbine bowl assembly
in that casing guide the liquid into (Reproduced by permission of Goulds Pumps,
the eye of the next stage or into ITT Industries)

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