Laserfiche WebLink
PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Mizumum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm P�rfonhon Dt6�,ug�s in crNt <br /> Pressure Distibution Head Perforation diameter <br /> feet inches <br /> 3. a. Select number of perforated lateraLs �-� �/32 1/4 <br /> b. Select perforation spacing= 3 feet. 1.oa o.56� 0.�4 <br /> c. Subtract 2 ft.from the rock.layer length. z ob o.so �a4 <br /> �S -2 ft._�feet. � <br /> Rock Lyer lensth <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing=�ft.+ ? ft,_�spaces b Use 2.0 feet for anything else. <br /> e. ��`- spaces+1 = �l perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to ��„,��.,� <br /> get total number of perforations. � x �a �r� _ � S perforations. <br /> g. � x ��_�gpm. <br /> SELECTED PUMP CAPACITY y � gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of dischazge. <br /> �feet <br /> 2. If pumping to a pressuse distribution system,five feet for pressure �''�°@'��Sn«^ <br /> required at manifold if gravity system,zera a":"�`•Q' =. <br /> �_feet T��v�a���� <br /> 3. Friction loss <br /> � a. Enter friction loss table with gpm and pipe diameter. ,�,� ��„tia,��,!„K <br /> Read friction loss in feet per 100 feet from table(F-14). P'�` <br /> F.L.= a• � ft./100 ft of pipe � ���� � <br /> . ._.._...._ . ':�i-'l <br /> b. Deteraune total pipe length from pump to dischazge ------------------------------------- <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-1.25 hmes pipe length= <br /> J c�o x 1.25= ac�o feet <br /> Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying Nominal <br /> friction loss in ft/100 ft by equivalent pipe length. pipe dia. <br /> Total friction loss= a• `l x ac�� +100= � feet <br /> F1ow Rate 1.5., 2„ 3�� <br /> 4. Total head required is the sum of elevation difference, �� <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) (Z) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 206 0.30 <br /> 40 8.91 264 0.39 <br /> TOTAL HEAD �_feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> '-1� gpm (Step A) with at least �feet of total hea�i (Step B). <br />