Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
Vertical Pumps 115 Figure 9-2. Well pump with hollow shaft, electric motor (courtesy BW/IP international, Inc. Pump Division, manufacturer of Byron Jackson/United 1 Pumps). An alternate well pump design uses a submersible electric motor drive, which is close coupled to the pump as shown in Figure 9-4. The motor can either be of the "wet winding" or "dry winding" design. For large motors, 250 HP and up, the preferred construction is the dry winding with the motor sealed and oil filled [2]. The motor is typically mounted below the pump, so there will be continuous flow of liquid around the outside of the motor for cooling. The submersible configuration eliminates the need for a lineshaft
116 Centrifugal Pumps: Design and Application Figure 9-3. Vertical hollow shaft motor (courtesy U.S. Electrical Motors, Division of Emerson Electric Co.). with bearings and its inherent, critical alignment requirements. Only a conventional, taper thread discharge pipe with the power cable attached leads to the surface. Here it is connected to a discharge elbow on which the electrical conduit box is also mounted. It should be noted that the well casing must be sized so that there is room alongside the bowl assembly for the power cable and a protective guard. Wet Pit Pumps This pump configuration, illustrated in Figure 9-5, can be either of the single-stage or multi-stage design, depending on the application requiremerits and covers the complete range of specific speeds. Installed in a pit or inlet structure, the water surface on the suction side of the pump is free and subject to atmospheric pressure. The available NPSH for a pump in an open system of this type is therefore equal to the atmospheric pres-
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116 <strong>Centrifugal</strong> <strong>Pumps</strong>: <strong>Design</strong> <strong>and</strong> <strong>Application</strong><br />
Figure 9-3. Vertical hollow shaft motor (courtesy U.S. Electrical Motors, Division<br />
of Emerson Electric Co.).<br />
with bearings <strong>and</strong> its inherent, critical alignment requirements. Only a conventional,<br />
taper thread discharge pipe with the power cable attach<strong>ed</strong> leads to<br />
the surface. Here it is connect<strong>ed</strong> to a discharge elbow on which the electrical<br />
conduit box is also mount<strong>ed</strong>. It should be not<strong>ed</strong> that the well casing must be<br />
siz<strong>ed</strong> so that there is room alongside the bowl assembly for the power cable<br />
<strong>and</strong> a protective guard.<br />
Wet Pit <strong>Pumps</strong><br />
This pump configuration, illustrat<strong>ed</strong> in Figure 9-5, can be either of the<br />
single-stage or multi-stage design, depending on the application requiremerits<br />
<strong>and</strong> covers the complete range of specific spe<strong>ed</strong>s. Install<strong>ed</strong> in a pit<br />
or inlet structure, the water surface on the suction side of the pump is free<br />
<strong>and</strong> subject to atmospheric pressure. The available NPSH for a pump in<br />
an open system of this type is therefore equal to the atmospheric pres-
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