Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
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Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)

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Pipeline, Waterflood and CO 2 Pumps 159 Figure 10-25. Performance for one stage of multi-stage pipeline pump selected for "future" condition. Figure 10-26. Performance of pump from Figure 10-25 for single pump operation and two pumps in series plotted against system head curves.

160 Centrifugal Pumps: Design and Application Figure 10-27. Performance from Figure 10-25 modified by installation of low-capacity impellers for "initial" condition, 4,850 ft. The system requires only 3,750 ft, therefore 1,000 ft is lost to friction (head) across the control valve. Note with one pump operating and no throttling, the capacity will be 630 GPM and pump efficiency will be 72%. For reduced rates, throttling and wasting of energy will be avoided by running one pump as much time as possible and making up by running two only as necessary. Having determined size and configuration for the mainline units, let's consider how operation and efficiency can be improved in the initial 437 to 875 GPM capacity range. Figure 10-27 shows performance of the pump selected with impellers changed to pattern #2010-H (low capacity). This impeller, which peaks at 800 GPM, is more efficient at capacities below 760 GPM and would be a good choice for initial operation. One of the five-stage pumps, say the #1 unit, can be furnished destaged to four stages. By operating with four, five, or nine stages, various rates can be

Pipeline, Waterflood <strong>and</strong> CO 2 <strong>Pumps</strong> 159<br />

Figure 10-25. Performance for one stage of multi-stage pipeline pump select<strong>ed</strong><br />

for "future" condition.<br />

Figure 10-26. Performance of pump from Figure 10-25 for single pump operation<br />

<strong>and</strong> two pumps in series plott<strong>ed</strong> against system head curves.

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