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F-1 5 <br /> PUMP SELECTION PROC17DURE <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 (145 gpm) to prevent <br /> buildup of pressure in drop box <br /> 3. Use value from design 'of pressure distribution system <br /> SELECTED PUMP CAPACITY . <br /> B. Determine head requirements: <br /> 1 . Elevation difference between pump and point of discharge _ <br /> 2• If pumping to a pressure distribution system, add 5 feet y — feet <br /> for pressure required at manifold <br /> 3. Friction loss s___ feet <br /> a • Enter friction loss table with Spm and pipe diameter. <br /> Read friction loss in feet per 100 feet from page F-18. <br /> F. L. = - _7, 6'L ft/100 ft <br /> b• Determine total pipe length from pump to discharge <br /> point. Add 25 percent to pipe length for fitting <br /> loss, or use a fitting loss chart. Equivalent pipe <br /> length = 1.• 25 times pipe length = 1. 25 x /2 .5' _ �.56 feet <br /> C. Calculate total friction loss by multiplying --- <br /> fr. icti.on loss in f t/:100 f t by equ•i.v,)lent pipe <br /> length . <br /> Total friction loss = z.6y _ <br /> 4. Total head required is the sum of lev x y.�6 y-- �_..— feet <br /> e ation difference, <br /> special head requirements, and total friction .loss. <br /> TOTAL i11 An . . . . . . . . . . . . .--- <br /> . / f 't <br /> C. Pump selection <br /> i • A pump must b selected Eo deliver at leas 9a. _ gprr lam` <br /> with at lea ��• / f et of total head, <br /> D. To maximize pumplife <br /> ct sump size for 4 to 5 pump Ifo, <br /> (wl <br /> operations per day. S « � <br /> R ' <br /> 1'.• Ca1cu13Ce drainback <br /> 1 . Determine total pi.pe length, Z Jr feat . <br /> 2 . Determine liquid volume of pi.pe7: a.l.. <br /> 100 feet. (See page E-.18) _1—1-''�_- f' lops per <br /> 3. Multiply length by volume: Drainbacic quant i,ty <br /> Z s _ feet c /7.�f g,111ons/7.C)O ft �Y gallons <br /> G • Sugg/ ested 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 household energy costs. <br />