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• ' pUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> \Gravity Distribution END PERFORATION OF A PERFORATEO LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of �,,,.�,�„ <br /> water use rate. Towen p�-'- <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . ; .,.:.:,.:.... ... .....:.,.:;,,,;�::.: <br /> �'�,'Loy�r ol Gsol�atU�FaDrk(a lar- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ;:`�'��s��e�,,,„ `y���N�y p Nron caend <br /> +^.,-+..,.• :��rrit�red raln pop�r) <br /> a e a IMlaolian D�Hhd Hor4onlollY <br /> Pressure Distribution • • ��e o wa �P <br /> 3. a. Select number of perforated laterals 3 '�;v��+ ,� N �b.� �z•�o Ee,. <br /> a'_Fldd Rxk• �.. • e� no�r tor.� <br /> b. Select perforation spacing= ? ft. � ' � '`P„i;;o;io�;',,�,,.a m <br /> c. Subtract 2 ft.from the rock layer length. c,p��„a„Y„ B°"°'"°'�'.�d <br /> ��-2 ft._ �'L ft. <br /> ory�no�son F.op�rq searin�a <br /> BNen Plackp Sond loya <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= �`L ft.+_�ft._�_spaces <br /> TABLE OF PERApRATION DISCHARGES W CPM <br /> e. �_spaces+1 =�i�perforallons/lateral <br /> ' f. Multiply perforaHons per lateral by number of laterals to Head Perforationdiameter(inches) <br /> get total number of perforations. , � <br /> ,�-� x `' ��= U'L perforations. �" �• <br /> 1.Oa 056 0.74 <br /> g �� X �y =3 L$Pm• 2 ob o.eo i.o�a <br /> w+� swT <br /> 2S 0.89 1.]7 <br /> SELECTED PUMP CAPACITY 3 � m 3.0 0.98 t.28 <br /> SP a.o iaa �.a� <br /> 5.0 126 1.65 <br /> B.Determine head requirements: <br /> 1. ElevaHon difference between um and int of dischar e. aUse lA foot of head for Trsfdentlal systemt. <br /> . P p � $ bUse 2.0 feet of head for other establishments <br /> '� feet . <br /> 2. If pumping to a pressure distribudon system,add five feet for pressure <br /> required at manifold <br /> � �`� feet <br /> 3. Frietion loss � 1'�Pe Ler►Bd► , <br /> a. Enter friction loss table with gpm and pipe diameter. Poinc of D'ucharge <br /> Read friction loss in feet per 100 feet from table. 10�.� <br /> F.L= 1•�o ft./100 ft of pipe Elevadon Difference <br /> b. Determine total pipe length from pump to discharge p„n,p �y,� <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18b <br /> lengih-1.25 rimes pipe length= �.5 inch 2.0 inch 3.0 inch <br /> � � 0 x 1.25=�.:� � feet gpm Fricdon 1«s per too n otp�Pe <br /> c. Calculate total friction loss by multiplying l0 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total friction loss= I. (e x /3 F� +.100=�feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> s ial head r uirements,and total friction loss. 18 2.03 0.60 <br /> P� �1 20 2.47 0.73 0.11 <br /> ' ' 25 3J3 1.11 0.16 <br /> � <br /> � � + � + �z-- _30 _ ._5.23_.__ _ 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 "�:if6'- 0.30 <br /> 40 11.07 2.64 039 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD �feet 50 • 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> C. Pump selection <br /> �1. A pump must be selected to deliver at least 31_gpm (Step A) <br /> with at least a�) feet of total head (Step B). <br />