Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
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
- Page 198 and 199: High Speed Pumps 183 This expressio
- Page 200 and 201: High Speed Pumps 185 Figure 11-3. P
- Page 202 and 203: High Speed Pumps 187 As an aside, p
- Page 204 and 205: High Speed Pumps 189 Figure 11-5. I
- Page 206 and 207: High Speed Pumps 191 Figure 11-7. I
- Page 208 and 209: High Speed Pumps 193 Figure 11-9. R
- Page 210 and 211: High Speed Pumps 195 Figure 11-10.
- Page 212 and 213: High Speed Pumps 19? Figure 11-11.
- Page 214 and 215: High Speed Pumps 199
- Page 216 and 217: High Speed Pumps 201 Figure 11-13.
- Page 218 and 219: High Speed Pumps 203 nal bearings a
- Page 220 and 221: High Speed Pumps 205 Barske, U, M.,
- Page 222 and 223: Double-Case Pumps 207 jected to ext
- Page 224 and 225: Double-Case Pumps 209 Figure 12-3.
- Page 226 and 227: Double-Case Pumps 211 Figure 12-4.
- Page 228 and 229: Double-Case Pumps 213 ally by split
- Page 230 and 231: Double-Case Pumps 215 The throttle
- Page 232 and 233: Figure 12-11. pump for 4,000 psi In
- Page 234 and 235: Double-Case Pumps 219 so that the t
- Page 236 and 237: Double-Case Pumps 221 Figure 12-12.
- Page 238 and 239: Doubte-Case Pumps 223 Volute Casing
- Page 240 and 241: Double-Case Pumps 225 5. Survey of
- Page 242 and 243: Slurry Pumps 227 An approximate com
- Page 244 and 245: Slurry Pumps 229 Figure 13-2. Nomog
- Page 246 and 247: Slurry Pumps 231 Table 13-2 Alloys
- Page 250 and 251: Figure 13-4, (A) (B) (C)
- Page 252 and 253: Slurry Pumps 237 There is little to
- Page 254 and 255: Figyre 13-7, (courtesy Pumps, Inc.)
- Page 256 and 257: Flgyr« 13-8, with (courtesy Goulds
- Page 258 and 259: Slurry Pumps 243 ing the pump speed
- Page 260 and 261: Slurry Pumps 245 Where there exists
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- Page 280 and 281: Figure 14-14. Internally adjustable
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234 <strong>Centrifugal</strong> <strong>Pumps</strong>: <strong>Design</strong> <strong>and</strong> <strong>Application</strong><br />
Abrasion Class<br />
Mildly abrasive<br />
Abrasive<br />
Severely abrasive<br />
Primary circuit<br />
Dr<strong>ed</strong>ge<br />
Table 13-3<br />
Pump Selection Guide for Wear Resistance<br />
Nature of Slurry<br />
Concentrations of relatively<br />
soft solids or very low concentrations<br />
(measur<strong>ed</strong> as<br />
ppm) of hard silt-siz<strong>ed</strong> particles.<br />
Low concentrations of hard<br />
fines or high concentrations<br />
of soft material.<br />
High concentrations of hard<br />
fines or lower concentrations<br />
of coarse material.<br />
Maximum concentrations of<br />
fines or coarse material up<br />
to 10 mm usually.<br />
Large concentrations of<br />
boulder-siz<strong>ed</strong> solids.<br />
Selection<br />
Cast iron construction usually<br />
satisfactory, but hard- fac<strong>ed</strong><br />
impeller rings <strong>and</strong> special attention<br />
to stuffing box area is<br />
justifi<strong>ed</strong>. Consider stainless<br />
steel impeller. No limits on<br />
pump spe<strong>ed</strong>.<br />
Slurry pump design requir<strong>ed</strong><br />
with Ni-hard, chrome iron, or<br />
rubber construction. Open impellers<br />
are acceptable. Although<br />
no limits are plac<strong>ed</strong> on<br />
pump spe<strong>ed</strong>, discretion is advis<strong>ed</strong>.<br />
Slurry pump design requir<strong>ed</strong><br />
with chrome iron construction.<br />
Restrictions are plac<strong>ed</strong><br />
on allowable pump spe<strong>ed</strong> <strong>and</strong><br />
total head.<br />
Severe-duty slurry pump design<br />
requir<strong>ed</strong> with chrome<br />
iron construction. Large restrictions<br />
plac<strong>ed</strong> on allowable<br />
pump spe<strong>ed</strong> <strong>and</strong> total head.<br />
Parts life is measur<strong>ed</strong> in<br />
months.<br />
Dr<strong>ed</strong>ge type design requir<strong>ed</strong><br />
with manganese steel construction<br />
to resist impact, \fery<br />
low rotational spe<strong>ed</strong> requir<strong>ed</strong>,<br />
Casing<br />
Areas of Wear<br />
The rate of wear <strong>and</strong> the hydraulic forces within the pump will be r<strong>ed</strong>uc<strong>ed</strong><br />
if concentric-type casing volutes are adopt<strong>ed</strong> over conventional<br />
spiral volutes. At "off" design point operation, the static pressure around<br />
the impeller's outside diameter will be relatively uniform, <strong>and</strong> turbulence<br />
in the vicinity of the cutwater will be effectively r<strong>ed</strong>uc<strong>ed</strong> as will the<br />
slurry velocity entering the casing throat. Recirculation flows from the