Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
Double-Case Pumps 207 jected to external differential pressure, so any bolting required to hold it together is minimal. The outer barrel is designed as an unfired pressure vessel, and can be constructed to the requirements of well established industry codes. Volute Casing with Opposed Impellers Figure 12-1 illustrates the volute-type opposed-impeller configuration, The inner case assembly is horizontally split and consists of two identical halves, cast from the same pattern. The double-volute construction provides radial hydraulic balance. The opposed impeller arrangement minimizes resultant axial thrust, providing inherent axial thrust balance, Figure 12-1. Volute-type opposed-impeller double-case pump (courtesy BW/IP International, Inc. Pump Division, manufacturer of Byron Jackson/United Pumps).
208 Centrifugal Pumps: Design and Application Diffuser Casings with Balance Drum Diffuser-type pumps have all impellers facing in one direction, resulting in high axial thrust forces. Figure 12-2 shows a diftuser-type pump with a balance drum to carry the axial thrust forces. The inner case assembly is vertically split, and the symmetry of the diffusers provides radial hydraulic balance. Diffuser Casings with Balance Disk Figure 12-3 shows the diffiiser-type configuration with a balance disk that carries the axial forces. Except for the axial balancing device, the construction is similar to the previous diffuser-type design. Balance disk construction is used for clean services such as boiler feed because of its ability to completely balance axial thrust at all operating flow rates. Figure 12-2. Diffuser-type in-line impeller, double-case pump with balance drum (courtesy Dresser Pump Division, Dresser Industries, Inc.). Applications Common applications for double-case pumps are: « Boiler feed pumps in central station and large industrial fossil-fueled power plants. • High pressure and/or high temperature pumps in oil refineries or chemical plants.
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- Page 188 and 189: 11 By Edward Gravelle Sundstrand Fl
- Page 190 and 191: High Speed Pumps 175 History and De
- Page 192 and 193: High Speed Pumps 177 Figure 11-2. (
- Page 194 and 195: High Speed Pumps 179 some portion o
- Page 196 and 197: High Speed Pumps 181 This is to say
- 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 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 248 and 249: Slurry Pumps 233 Figure 13-3. Class
- 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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Double-Case <strong>Pumps</strong> 207<br />
ject<strong>ed</strong> to external differential pressure, so any bolting requir<strong>ed</strong> to hold it<br />
together is minimal. The outer barrel is design<strong>ed</strong> as an unfir<strong>ed</strong> pressure<br />
vessel, <strong>and</strong> can be construct<strong>ed</strong> to the requirements of well establish<strong>ed</strong> industry<br />
codes.<br />
Volute Casing with Oppos<strong>ed</strong> Impellers<br />
Figure 12-1 illustrates the volute-type oppos<strong>ed</strong>-impeller configuration,<br />
The inner case assembly is horizontally split <strong>and</strong> consists of two identical<br />
halves, cast from the same pattern. The double-volute construction provides<br />
radial hydraulic balance. The oppos<strong>ed</strong> impeller arrangement minimizes<br />
resultant axial thrust, providing inherent axial thrust balance,<br />
Figure 12-1. Volute-type oppos<strong>ed</strong>-impeller double-case pump (courtesy BW/IP<br />
International, Inc. Pump Division, manufacturer of Byron Jackson/Unit<strong>ed</strong><br />
<strong>Pumps</strong>).
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