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. Sut .�.:t 2 ft. from the rock layer length. <br />1=rG;W=- 2 ft. on ft. <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing : ft. + ft. nospaces <br />e, spaces + 1 = _ perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. <br />t;. x ��= perforations. <br />g. x � __ gpm. 42 <br />SELECTED PUMP CAPACITY. gpm <br />B. Determine head requirements: <br />1. Elevation difference between pump and point of discharge. <br />1 Z feet <br />2. if pumping to a pressure distribution system, add five feet for pressure <br />required at manifold <br />5_ 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 = 4, g ft./100 ft of hive <br />b. Determine total pipe length iIim pump to discharge <br />point. Add 25 percent to pipe length for fitting <br />loss, or use a fitting loss : •fart. Equivalent pipe <br />length -1.25 times pipe length no <br />�.. x 1.25 to 36y feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss = ?tx> x ZS� +100 y - i -'+T feet <br />4. Total head required is the sum of elevation difference, <br />special head mquirements, and total friction loss. <br />-LZ + +�4_ <br />(1) (2) (30 <br />TOTAL HEAD 71 feet <br />C. Pump selection 4� <br />1. A pump must be selected to deliver at least 46- gpm (Step A) <br />with at least _3_ feet of total head (Step B). <br />1W POWORATInN OF A PEWORATED LATERAL <br />team Cam <br />TM..e <br />OF M amount. nma,k IN us.- .. Oq a)awsw MAP" <br />Nrw �� orr. II.�w.wry <br />.r. w.rAt LSW Ir In UP <br />M <br />.1 Pam Lopor <br />P-Iv016 'IJ.aW .I <br />TABU OF PERFORAt7ON DtSCMARGES IN GPM <br />Head Perforation dlamater Onchaa) <br />./S <br />1/, <br />loos <br />036 <br />0.74 <br />13 <br />0.69 <br />0.90 <br />2.0b <br />Oao <br />1.04 <br />23 <br />0.39 <br />1.17 <br />3.0 <br />0.96 <br />128 <br />4.0 <br />1.13 <br />1.47 <br />SA <br />126 <br />1.65 <br />aU" 1.0 foot of hnd for residential systems <br />bUn 20 fact of hand for other nublishmmis <br />Pipe LAmgeh <br />i <br />Point of I <br />D <br />FUvuion Differencep Pum <br />F-18b <br />1.5 inch 2.0 inch 3.0 inch <br />Urn PrIctin ten. N laa n d po. <br />10 <br />0.69 <br />. 0.20 <br />12 <br />U.96 <br />0.28 <br />14 <br />1.23 <br />0.38 <br />16 <br />1.63 <br />0.48 <br />18 <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 />54 <br />0.39 <br />45 <br />14.73 <br />3.2E <br />0.48 <br />s0 <br />3.99 <br />0M <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />