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Figure 12.24 classifies the slurry based on its particle size, concentration and specific gravity. Slurries in Class 4 are the most difficult to pump considering erosive wear.

Figure 12.24

Table 12.8 shows the suitability of different wetted materials for resisting wear.

Table 12.8. General suitability of wetted materials.

Mechanical design is dictated by the material of the wetted parts. Cast iron and stainless steel usually do not require any special design. White irons and similar very hard materials are difficult to machine and are also brittle. For this reason, they are clamped together instead of being bolted. Elastomers are usually made as replaceable liners that are clamped inside the casing and cover. Impellers are bonded with the elastomeric materials.

The Hydraulic Institute has published a ninety-page standard on this subject designated as ANSI/HI 12.1-12.6 Rotodynamic (Centrifugal) Slurry Pumps, which is available at www.pumps.org.

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