Laserfiche WebLink
' 9 <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPM <br /> Pressure Distibution Head Perforation diameter <br /> feet inches <br /> 3.a. Select number of perforated laterals 7/32 1/4 <br /> b. Select perforation spacing= feet. l.oa 0.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. 1.5 0.69 0.90 <br /> Rock layer length <br /> -2 ft. = feet. 2.ob o.so i.oa <br /> d. Determine the number of spaces between perforations. a Use i.o foot singie homes. <br /> Length perf.spacing= ft.= ft.= spaces b Use 2.o feet for anyching else. <br /> e. spaces+1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. a e�a 5 x ��S�ne�= perforations. <br /> D' perTs X gpm pec SPm• ��` , <br /> SELECTED PUMP CAPACITY��'�--�m X <br /> B.Determine head requirements: <br /> 1. Elevation difference between p p and point of discharge. <br /> �feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure s��°'ea°"�,�Sys«, <br /> required at manifold if gravity system,zero. °�°="='a� <br /> -�� feet Total pipe length <br /> 3. Friction loss <br /> a. Enter friciion loss table with gpm and pipe diameter. I„ie .� Flevatinn Diffetence <br /> Read friction loss in feet per 100 feet from table(F-14). P'� <br /> F.L._�,��' ft./100 ft of pipe <br /> ................. . . <br /> b. Determine total pipe length from pump to discharge ---"---""""-"""""'-"----"""""-'"'" <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length- 125 times pi e length= <br /> 3c7 x 1.25=�feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft y equivale�pipe length� Nominal <br /> Total friction loss= �: 3 x ��_=100= � feet pipe dia. <br /> Flow Rate <br /> 4. Total head required is the sum of elevation difference, �m 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> `� 20 2.47 0.73 0.11 <br /> + � + �' 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> 8.91 0.39 <br /> TOTAL HEAD �feef 45% 11.07 3.28 i 0.48 <br /> 13.46 0.58 <br /> C. Pump selection bo 5.60 o s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.�9 <br /> �-�� !'n�xl. A pump must be selected to deliver at least <br /> --5 gpm (Step A) with at least �feet of total head (Step B). <br />