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