8.7 Special Pumps
313
8.7.4 Slurry Pumps
Clogging of the rotor channels must be avoided by providing large passages. Open
impellers with one or two blades are applied (Fig. 8.25). Vaned or vaneless diffuser
rings are not used because of the clogging risk. A ring-shaped stator channel with
constant cross section around the rotor is typical. If a volute is used, the tongue must
leave sufficient clearance to allow the passage of the largest solid particles. Packing
seals are rinsed with pressurised clean water in order to prevent sand entrance. The
presence of solid elements in the pumped liquid decreases the pump performance.
This is also the case after strong wear, which may be reduced by using wear-resistant materials.
Fig. 8.23 Canned motor chemical pump. (courtesy Grundfos)
Fig. 8.24 Magnetic drive chemical pump. (courtesy Klaus Union)
313
8.7.4 Slurry Pumps
Clogging of the rotor channels must be avoided by providing large passages. Open
impellers with one or two blades are applied (Fig. 8.25). Vaned or vaneless diffuser
rings are not used because of the clogging risk. A ring-shaped stator channel with
constant cross section around the rotor is typical. If a volute is used, the tongue must
leave sufficient clearance to allow the passage of the largest solid particles. Packing
seals are rinsed with pressurised clean water in order to prevent sand entrance. The
presence of solid elements in the pumped liquid decreases the pump performance.
This is also the case after strong wear, which may be reduced by using wear-resistant materials.
Fig. 8.23 Canned motor chemical pump. (courtesy Grundfos)
Fig. 8.24 Magnetic drive chemical pump. (courtesy Klaus Union)