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This siphon effect relies on atmospheric pressure to allow the pressure and pressure potential energy to drop as the water travels upward inside the sealed pipe. But eventually the pressure of the rising water reaches zero and no further reductions in pressure and pressure potential energy are possible.
Figure 22 Flow rate is limited by friction in the system when the static head is zero. In Figure 23, the discharge pipe end is raised vertically until the flow stops, the pump. cannot raise the fluid higher than this point and the discharge pressure is at its. maximum.