Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
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Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)

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Slurry Pumps 233 Figure 13-3. Classification of pumps according to solid size.

234 Centrifugal Pumps: Design and Application Abrasion Class Mildly abrasive Abrasive Severely abrasive Primary circuit Dredge Table 13-3 Pump Selection Guide for Wear Resistance Nature of Slurry Concentrations of relatively soft solids or very low concentrations (measured as ppm) of hard silt-sized particles. Low concentrations of hard fines or high concentrations of soft material. High concentrations of hard fines or lower concentrations of coarse material. Maximum concentrations of fines or coarse material up to 10 mm usually. Large concentrations of boulder-sized solids. Selection Cast iron construction usually satisfactory, but hard- faced impeller rings and special attention to stuffing box area is justified. Consider stainless steel impeller. No limits on pump speed. Slurry pump design required with Ni-hard, chrome iron, or rubber construction. Open impellers are acceptable. Although no limits are placed on pump speed, discretion is advised. Slurry pump design required with chrome iron construction. Restrictions are placed on allowable pump speed and total head. Severe-duty slurry pump design required with chrome iron construction. Large restrictions placed on allowable pump speed and total head. Parts life is measured in months. Dredge type design required with manganese steel construction to resist impact, \fery low rotational speed required, Casing Areas of Wear The rate of wear and the hydraulic forces within the pump will be reduced if concentric-type casing volutes are adopted over conventional spiral volutes. At "off" design point operation, the static pressure around the impeller's outside diameter will be relatively uniform, and turbulence in the vicinity of the cutwater will be effectively reduced as will the slurry velocity entering the casing throat. Recirculation flows from the

Slurry <strong>Pumps</strong> 233<br />

Figure 13-3. Classification of pumps according to solid size.

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