Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
Vertical Pumps 121 Figure 9-8. Barrel-mounted pump (courtesy BW/IP International, Inc. Pump Division, manufacturer of Byron Jackson/United Pumps). pense. Often a special first-stage impeller with superior NPSH characteristics is furnished. Otherwise, the bowl assembly is of a multi-stage design with identical impellers of the radial or semi-radial flow type. The bowl assembly is either directly suspended from the discharge head or connected to the head with a discharge spool, the length of which is determined by the NPSH required. The configuration shown in Figure 9-9 is of the pull-out type that permits removal of the pump without disturbing either the discharge or suction nozzle connections. Pump alignment is, within reason, not affected by any nozzle forces imposed. The suction nozzle can be located either in the suction barrel or in the discharge head, in line with the discharge nozzle. The latter "in-line" construction is commonly used for booster applications in pipelines. The shaft sealing device in the discharge head is usu-
122 Centrifugal Pumps: Design and Application Figure 9-9. Barrel-mounted pulf-out pump. ally a face-type mechanical seal. The discharge head supports the driver, which should preferably be of the solid shaft design, either as a direct electric motor drive or a horizontal driver through a right angle gear. The unit is typically supported under the top flange of the suction barrel and bolted to an adequate foundation with a desired mass of five times the total unit weight. If desired, the entire barrel can be embedded in concrete or thermally insulated for high or low temperature applications. Weil Pumps Applications The most common applications for well pumps are: * Water well, or bore hole installations, using either a surface-mounted driver or a close-coupled submersible motor. • Incline-mounted water pumps installed on lake or river banks and driven by a conventional electric motor or a close-coupled submersible motor.
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122 <strong>Centrifugal</strong> <strong>Pumps</strong>: <strong>Design</strong> <strong>and</strong> <strong>Application</strong><br />
Figure 9-9. Barrel-mount<strong>ed</strong> pulf-out pump.<br />
ally a face-type mechanical seal. The discharge head supports the driver,<br />
which should preferably be of the solid shaft design, either as a direct<br />
electric motor drive or a horizontal driver through a right angle gear. The<br />
unit is typically support<strong>ed</strong> under the top flange of the suction barrel <strong>and</strong><br />
bolt<strong>ed</strong> to an adequate foundation with a desir<strong>ed</strong> mass of five times the<br />
total unit weight. If desir<strong>ed</strong>, the entire barrel can be emb<strong>ed</strong>d<strong>ed</strong> in concrete<br />
or thermally insulat<strong>ed</strong> for high or low temperature applications.<br />
Weil <strong>Pumps</strong><br />
<strong>Application</strong>s<br />
The most common applications for well pumps are:<br />
* Water well, or bore hole installations, using either a surface-mount<strong>ed</strong><br />
driver or a close-coupl<strong>ed</strong> submersible motor.<br />
• Incline-mount<strong>ed</strong> water pumps install<strong>ed</strong> on lake or river banks <strong>and</strong><br />
driven by a conventional electric motor or a close-coupl<strong>ed</strong> submersible<br />
motor.
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