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PUMP SELECTION PROCEDUIZE � <br /> A. Determine pump capacity: <br /> � . <br /> 'GravityDistribution END PERFORATION OF A PEF2FORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of c.,..c,�« <br /> water use rate. rova�� <br /> 2. Maximum suggested for delivery t�a drop box of a home system is 2,700 ._,_ ...:;..: ... ..�''' -- <br /> �Loy�r of Geouxtil� faDrk(a fov- <br /> gallons per hour(45 gpm)to prevent ouild-up of pressure in drop box. ��,,s��a�,.., .,,,�h,o,.�,,,�y„,,,a.«,�., <br /> � %�ritA red rotin paper) <br /> a a e o PKlaolion Drlll�d Hori:onlolly <br /> Pressure Distribution • Mto p Wo� Top <br /> 3. a. Select number of rforated laterals � �'i:��. . ,�, a �.�t� �2•�o eaa. <br /> � o .Fl�ld Rxk ��� • ol Rock Layer <br /> b. Select perforation spacing= �' fL Pe�fwo�bns Lnca�ed o� <br /> c. Subtract 2 ft.from the rock layer]ength. c''°"S°^°�Y„ �^��°'"°� `°"`°' <br /> �c;���,-2ft.= �� ft. :. , . .: , : <br /> awMo� son Fropv�y swrinw <br /> B�Iw�PIocM+q Sand Loyer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing=�ft.+ -t ft._�spaces TABLE OF PERFORATION DISCHARGFS IN GPM <br /> e. �spaces+ 1 =�perforaHons/lateral <br /> ' f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. ,�n ,�� <br /> `� -�4 perforations. <br /> �'. X �- <br /> I.Oa OS6 0.74 <br /> �L� X � �y O m. ]S 0.69 0.90 <br /> g' � a�_�gP Z.ob o.ao �.oa <br /> 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY � D m 3.0 0.98 t.28 <br /> gP 4.0 1.73 1.47 <br /> � 5.0 1.26 1.65 <br /> B.Determine head requirements: aUse].0 foot of head for residential systems. <br /> �l. Elevadon difference between pump and point of discharge. bUse 2.0 feet of head for other establishments <br /> � �feet <br /> 2. If pumping to a pressure distribuHon system,add five feet for pressure <br /> required at manifold <br /> S� feet <br /> 3. Friction loss P'�L�'g� <br /> a. Enter friction loss table with gpm and pipe diameter. Poim of Discharge <br /> Read friction loss in feet per 100 feet from table. �`�''�7 I <br /> F.L._ �• �- ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge pun,p '�1 <br /> point. Add 25 percent ta pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18b <br /> length-1.25 times pipe length= � 1.5 inch 2.0 inch 3.0 inch <br /> 1 a� x 1.25= l,5 � feet gPm Friaim locs pa 100 ft of pipe <br /> c. Calculate total friction loss by multiplying 10 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 5lo x a•(,� +100=�_feet 14 1.28 038 <br /> 4. Total head r uired is the sum of elevation difference, 16 1.63 0.48 <br /> � 18 2.03 0.60 <br /> special head requirements,and total fricHon loss. 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> � C� + � +�_ 30 523 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <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 /> %l. A pump must be selected to deliver at least '-1 � gpm (Step A) <br /> with at least�feet of total head (Step B). <br /> � <br />