Laserfiche WebLink
) PUMP SELEmON PROCEDURE <br />A. Determine pump capacity: <br />Gravity Distribution <br />1. Minimum suggested is 600 gallons per hour (10 gpm) to stay ahead of <br />water use rate. <br />" Maximum suggested for delivery to a drop box of a home system is 2,700 <br />gallons per hour (45 gpm) to prevent build-up of pressure in drop box. <br />Pressure Distibution <br />3. a. <br />b. <br />c. <br />d. <br />e. <br />f. <br />g. <br />Select number of perforated laterals _3~-- <br />Select perforation spacing= -~ feet. <br />Subtract 2 ft. from the rock !aver length. <br />l.,,'ef'. -2ft.= {LC,. fe,et. <br />Roe.Ir. Ltyor ~ f . Determine the number of spaces between per orations. <br />Length perf. spacing= C,, ~ ft. + ..l_ ft. = .3..2_ spaces <br />J. ;;i.._ spaces + 1 = ....d..:;._ perforations/lateral <br />Multiply perforations per lateral by number of laterals to ?1 3~'' <br />get total number of perforations. w:i, x ~':tr.,...i = -'a,_ perforations. <br />~ x~~=~gpm. <br />SELECTED PUMP CAP A CITY 3 o/ gpm <br />B. Determine head requirements: <br />1. Elevation difference between P,Ump and point of discharge. <br />& feet <br />2. If pumping to a pressure distribution system, five feet for pressure <br />required at manifold if gravity ~tern, zero. <br />_ .... ~...__feet <br />3. Friction loss <br />a. Enter friction loss table with gpm and pipe diameter. <br />Read friction loss in feet per 100 feet from table. <br />F.L. = ::? • (.,. ft./100 ft of pipe <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 = <br />2 5 X 1.25 = '3 / feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss= ~, k x '3 I +100 = / feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />_ ___,1..,,,c.,.__ + --'s=---+ I <br />(1) (2) (3d <br />TOTAL HEAD Id___. feet <br />C. Pump selection <br />1. A pump must be selected to deliver at least <br />~ gpm (Step A) with at least _J_2,_ feet of total head (Step B). <br />F-17 <br />E/-0 PERFORATION a" A P£RFORATE'D L'-TE;;:.t. <br />~·~ -Al L...,... 12• lo £~~ <br />"-="'-'-'=-'-'=":"'......,.--,.,-_..,c.,..;,:...,,·· of Roe.& w:,,,.r <br />Required Perforation Discharge <br />in gallons per minute (gpm) <br />~e ~2 md>paf ¼ mdopaf <br />(feet) <br />1.0a 0.56 0.74 <br />2.0b 0.80 1.04 <br />a. Use for single family homes <br />b. Use for all other applications <br />Pipe Length <br />□Pump <br />Point of Discharge <br />-----T/OP~ <br />Elevation Difference I <br />~~✓ <br />F-18b <br />1.5 inch 2.0 inch 3.0 inch <br />gpm Fria.ia, )a;s per l 00 ft of pipe <br />10 0.69 0.20 <br />12 0.96 0.28 <br />14 1.28 0.38 <br />16 1.63 0.48 <br />18 2.03 0.60 <br />20 2.47 0.73 0.11 <br />25 3.73 1.11 0.16 <br />30 5.23 1.55 0.23 <br />35 7.90 ~.06._,. 0.30 <br />40-11.07 ,2.64 0.39 <br />45 14.73 3.28 0.48 <br />50 3.99 0.58 <br />55 4.76 0.70 <br />60 5.60 0.82