Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
Vertical Pumps 117 Figure 9-4. Submersible well pump (courtesy BW/IP international, Inc. Pump Division, manufacturer of Byron Jackson/United 1 " Pumps). sure, plus the static liquid level above the first-stage impeller, less correction for the liquid vapor pressure at the pumping temperature. Because the cost of a pit or intake structure is high and dependent on the depth of the structure, the submergence is typically kept to a minimum in line with sound design practices. As a result, the maximum pump speed is limited by the NPSH available and the required flow rate. Single-stage pumps can usually be furnished for pumping heads up to 200 feet, but multi-stage pumps are required for higher heads. The bowl diameters of well pumps and their corresponding flow rates are restricted. However, wet pit pumps can be furnished in any size and therefore for
118 Centrifugal Pumps: Design and Application Figure 9*5. Wet pit pump (courtesy BW/IP international, inc. Pump Division, manufacturer of Byron Jackson/United Pumps). any desired flow rate (see Figure 9-6). Considerations, other than the pump itself, usually dictate that requirements for large flow rates be split between two or more pumps operating in parallel. The pump setting (the axial length of the bowl assembly plus the length of the discharge column from which the bowl assembly is suspended) is normally less than 100 feet. The column houses the lineshaft, which is connected to the driver shaft with a rigid coupling in the discharge head (see Figure 9-5). The discharge head also houses a shaft sealing device. The driver, which is supported on the top of the discharge head, is generally provided with a thrust bearing of adequate size to carry the weight of the motor rotor and pump rotating element plus the hydraulic axial thrust developed by the pump. When the driver is not designed to carry the total axial thrust from the pump, a thrust bearing assembly must be provided in the discharge head above the shaft sealing device. A flexible type coupling must then be provided between the pump and the driver. While the discharge elbow is normally located in the head above the pump mounting floor, it may be advantageous for certain applications to
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118 <strong>Centrifugal</strong> <strong>Pumps</strong>: <strong>Design</strong> <strong>and</strong> <strong>Application</strong><br />
Figure 9*5. Wet pit pump (courtesy BW/IP international, inc. Pump Division,<br />
manufacturer of Byron Jackson/Unit<strong>ed</strong> <strong>Pumps</strong>).<br />
any desir<strong>ed</strong> flow rate (see Figure 9-6). Considerations, other than the<br />
pump itself, usually dictate that requirements for large flow rates be split<br />
between two or more pumps operating in parallel. The pump setting (the<br />
axial length of the bowl assembly plus the length of the discharge column<br />
from which the bowl assembly is suspend<strong>ed</strong>) is normally less than 100<br />
feet. The column houses the lineshaft, which is connect<strong>ed</strong> to the driver<br />
shaft with a rigid coupling in the discharge head (see Figure 9-5). The<br />
discharge head also houses a shaft sealing device. The driver, which is<br />
support<strong>ed</strong> on the top of the discharge head, is generally provid<strong>ed</strong> with a<br />
thrust bearing of adequate size to carry the weight of the motor rotor <strong>and</strong><br />
pump rotating element plus the hydraulic axial thrust develop<strong>ed</strong> by the<br />
pump. When the driver is not design<strong>ed</strong> to carry the total axial thrust from<br />
the pump, a thrust bearing assembly must be provid<strong>ed</strong> in the discharge<br />
head above the shaft sealing device. A flexible type coupling must then<br />
be provid<strong>ed</strong> between the pump <strong>and</strong> the driver.<br />
While the discharge elbow is normally locat<strong>ed</strong> in the head above the<br />
pump mounting floor, it may be advantageous for certain applications to
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