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Figure 8.1. Solids handling pump with wear plate (Reproduced with permission of Goulds
Pumps, ITT Industries)

For special industrial applications a variety of pump designs have been
developed. A popular option to the large closed impeller in some
industries is the open impeller that operates with a tight clearance
against a casing fitted with sacrificial wear plate as shown in Figure 8.1.

8.1.2 Municipal waste
In municipal waste management applications, solids handling pumps as
shown in Figure 8.2, are designed with the capability of handling
specified spherical diameters. A few models of such pumps will have an
open impeller while many will be designed with closed impellers having
the necessary clearance between the vanes of the impeller and also
between the shrouds.
For example, a 4 inch pump would have the ability to pass a 4 inch
sphere through the impeller. The same pump would have at least a 4
inch diameter suction nozzle and a 4 inch diameter discharge outlet.

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