Rate Of Flow

FIGURE 9 System-head curves for pump and tanks shown in Figure 6 with bypass valve open total from both systems. Therefore, the combined system-head curve B + C should take this into consideration. Similarly, curve C is added to curve A to obtain curve A + C. Note that when the flow is directed to tank B with the bypass open, pump flow is increased from Qb to QR and tank flow is decreased from QB to Q'B. When the flow is directed to tank A with the bypass open, pump flow is increased from QA to Qp and tank flow is decreased from Qa to Q A.

If it is desired that there be no reduction in flow or that there be no waste of pumping power when flow is to tank A, the bypass can be closed either manually or automatically. If pump flow is monitored, this measurement can be used to open, close, or modulate the bypass valve automatically to maintain desired flow. Refer to Subsection 2.3.4 for more detailed information.

If operating procedures require that the pump occasionally be run with a closed valve (at the pump discharge or at tanks A and B), the bypass line must be designed to recirculate all of the minimum required pump flow QR, dissipating head HR, shown as curve C and Figures 8 and 9.

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Survival Treasure

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