Laserfiche WebLink
7 &,0^0 on.I, <br /> F-15 <br /> I �F -c EI�cN Paix ion;-,�;, <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> 1 . Minimum suggested is 600 gallons per hour (10 gpm) <br /> to stay ahead of water use rate <br /> 2. Maximum suggested for delivery to a drop box of a home <br /> system is- 2700 gallons per hour (45 gpm) to prevent <br /> buildup of pressure in drop box <br /> 3. Use value from design of pressure distribution system <br /> SELECTED PUMP.CAPACITY . . . . . . . . . . . . . . . . ,j S <br /> ----- gpm <br /> B. Determine head requirements: <br /> I . Elevation difference between pump and point of discharge _ <br /> i <br /> 2• If pumping to a pressure distribution system, acid 5 feet � " � feet <br /> for pressure required at manifold <br /> 3. Friction loss S__ feet <br /> a. Enter friction loss table with gpm and pipe diameter. <br /> Read friction•loss in feet per 100 feet from page F-18. <br /> F. L. = y 7� ft/100 ft <br /> b. Determine total pipe length from pump to discharge <br /> Point. Add 25 percent to pipe length for fitti�ig <br /> loss, or use a fitting loss chart. Equivalent I,ipe <br /> length = 1.. 25 times pipe length = 1.25 x 12- 5 <br /> c. Calculate total friction loss by multiplying - �.s 6 -- feet <br /> friction loss in ft/100 ft by equivalent pine <br /> length. V. 7 6 <br /> Total friction loss = pp x l 6 = 7. Y feet <br /> 4. Total head required is the sum of elevation difference, <br /> special head requirements, and total friction loss. <br /> TOTAL HEAD . . y <br /> feet <br /> C. Pump selection w <br /> 1 • A pump must be selected Eo deliver at least SS' <br /> with at least — gpm <br /> /�. feet of total head. <br /> D. To maximize pump life select sump size for 4 to 5 pump <br /> operations per day. <br /> X. Calculate drainback <br /> I . Determine total' pipe Ltillgeli, _ Z__s fent <br /> pit . <br /> Determine liquid volume of �c�_17 y,�- gallons per <br /> . 100 feet . (See page 1i-.i$) <br /> 3. Multiply length by volume: Drainback quantity = <br /> 12 S feet x t7p yZ gallons/100 ft - Z/, gallons <br /> 4 . Suggested drainback quantity is 10 percent of pumped quantity. <br /> A larger drainback percentage will decrease pump station <br /> efficiency- slightly but pumping energy costs are usually a <br /> relatively small part of the total lhounehold energy costs. <br />