Laserfiche WebLink
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 />2. 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 Distribution . <br />3. a. Select number of perforated laterals <br />b. Select perforation spacing = ft. <br />c. Subtract 2 ft. from the rock layer length. <br />-2ft.= ft. <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing: s ft. +- ft. ='7spaces <br />e. spaces + 1 - perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. <br />tom. <br />x Via= perforations. <br />g. x N;;7-W- _� gpm_ <br />SELECTED PUMP CAPACITY a gpm <br />B. Determine head requirements - <br />NI. Elevation difference between pump and point of discharge. <br />�L.I feet <br />2. If pumping to a pressure distribution system, add five feet for pressure <br />required at manifold <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 = D . (,0 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 />toss, or use a fitting loss chart. Equivalent pipe <br />length -1.25 times pipe length = <br />'!1 9_ x 1.25 = _ 1_1 !7_ feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss - I ► !I x 2,6�j_+100 = - I feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />+ + <br />111 (2) (30 <br />TOTAL HEAD 2_ feet <br />C. Pump selection <br />A- A pump must be selected to deliver at least =1 gpm (Step A) <br />with at least a�2 feet of total head (Step B). <br />ETD PERFORATWN OF A PERFORATED LATERAL <br />Qr . c«r <br />Tyra <br />�•L M p.MwBb FiK Irtw.• <br />LawL� fw lafw -: �i.,w � w w rn. cwwM <br />wM �=ri <br />hft t40 irur16P Nriw �ws <br />Y LftW 92' 4 Ed" <br />�Pwle.Mwr LAW" of <br />Clem $wr Lp. ON%= d L.Iww <br />TABLE OF PERFORATION DISCHARGES W GPM <br />Head PeLforation diam thxhrs) <br />•/, <br />1/' <br />I Aa <br />036 <br />0.74 <br />13 <br />OA9 <br />0.90 <br />2.0b <br />OEO <br />1.01 <br />2S <br />0E9 <br />1.17 <br />3.0 <br />0.98 <br />12s <br />40 <br />1.13 <br />1.47 <br />SA <br />1.26 <br />IAS <br />aUaa 1.0 foot d head for twidn*W $Yuen,& <br />War 2.0 teat of head for otbw sobblidw"b <br />Pipe Latglh <br />Pobtt of Discharge <br />EleveLim DiSerc= I <br />F-lib <br />1.5 inch 2.0 inch 3.0 inch <br />am tiriafar bm PW 140 a of pip <br />10 <br />0.69 <br />0.20 <br />12 <br />0.96 <br />0.2E <br />14 <br />1.2E <br />0.38 <br />16 <br />1.63 <br />0.4E <br />is <br />2.03 <br />0.60 <br />20 <br />2.47 <br />0.73 <br />0.11 <br />25 <br />3.73 <br />1.11 <br />0.16 <br />30 <br />5.23 <br />1.55 <br />0.23 <br />35 <br />7.90 <br />2.06 <br />0.30 <br />40 <br />11.07 <br />2.64 <br />0.39 <br />45 <br />14.73 <br />3.2E <br />0.43 <br />50 <br />3.99 <br />0.58 <br />55 <br />4.76 <br />0.70 <br />60 <br />3.60 <br />0.92 <br />