ENGR 120 Using Pump Curves to Select Pumps
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1 ENGR 120 Using Pump Curves to Select Pumps Let s close the loop. How does the pump testing that you have done connect to real-world engineering?
2 Pumps come in a variety of configurations. Motor Here are a few examples of centrifugal pumps. Pump Drive shaft connected to tractor PTO Pump
3 This is a submersible pump consisting of 4 stages connected in series. Each stage is a centrifugal pump in itself. The entire pump is submerged under water. Water out Pump stages In this submersible pump water flows from one stage to the next. The pressure (or head) increases as water moves through the pump, but the discharge remains constant. This is analogous to batteries connected in series. The total voltage is the sum of the voltage from each battery, but the current remains constant. Water in
4 Procedure for Selecting a Pump (1) Calculate the system head curve (2) Select the design discharge for the pump (3) Check pump manufacturer s catalogs and select a pump that will operate at maximum efficiency near the design discharge.
5 System Head Curve (1) Static lift vertical distance between the static water surface and the ground surface (2) Static discharge vertical distance between the ground surface and the ultimate point of use (3) Well drawdown decrease in water level in the well in response to pumping (4) Friction loss in the system head loss due to friction as water flows through the pipe, valves, bends, etc. (5) Operating head pressure (or head) required at the point of use. For example, irrigation sprinklers require a certain amount of pressure to operate correctly; a well system for a home typically pumps water into a pressure tank which then supplies water to the house.
6 These are all dynamic they increase with increasing discharge from the pump. To otal Head, H (ft) System Head Curve Operating Head Friction Loss Well Drawdown Static Discharge Static Lift Discharge, Q (gpm)
7 Operating head is determined by whatever is required at the ultimate point of use (sprinkler, pressure tank, etc.) Friction loss, h f, can be calculated from the Darcy-Weisbach equation where Well drawdown, s, can be calculated from the Jacob equation where
8 Select a submersible pump that will deliver 900 gpm to a water tank. Static lift = 20 ft Static ti discharge = 30 ft Dynamic head is discussed on the SE next slide. motor Static Discharge Static lift Drawdown pump
9 Let s assume we are able to calculate the friction loss, h f, from the Darcy-Weisbach equation. Note that h f varies with velocity of the water. This means it also varies with pump discharge, Q. where We can also calculate drawdown, s, from the Jacob equation. Note that this also varies with pump discharge, Q. where
10 We calculate and plot the total system head curve as the sum of static lift, static discharge, well drawdown, friction loss and operating pressure. The system head curve will be a function of pump discharge. Let s assume we have done these calculations and plotted the system head curve as shown of the following graph.
11 System Head Curve Now we superimpose this curve on the pump curves obtained from the pump manufacturer. Static Lift + Static Discharge The pump curves from the manufacturer were determined in essentially the same way you determined your pump curves.
12 System Head Curve Static Lift + Static Discharge Operating Point If we operate this pump at 1600 RPM, it will deliver 900 GPM against a total system head of 120 ft. Efficiency is 71% (slightly less than peak efficiency of 72%.)
13 System Head Curve Static Lift + Static Discharge What will happen if we operate the pump at 1200 RPM? The total system head drops to 75 ft, and the pump will deliver only 550 GPM. The efficiency drops to 69%. New Operating Point
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