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�� ° �• F-17 PtiMP SEI,ECTION PROCEDURE ENO PERFORAT�ON OF A PERFOit4TED L4TERAL A. Determine pump capacity: �-�- Gravity Distribution ' ..�.«� 1. Minimum suggested is 600 gallons per hour(70 gpm)to stay ahead of - : • «�..N„w F,e,k,,,,a,- c.. wa ter use rate. •.� "a"S"'`'r` �'""`"�'°'��,a`�"." •Nls na.wti pevw) 2. Maximum suggested for delivery to a drop box of a home system is 2,700 _ . »��°^�°"� gallons per hour(45 gpm)to prevent build-up of pressure in drop box. .:.,;p,„ ;�-w�ro.� �x•�o Eao• o Mia e�R«�lq« . � ' Vr�aalery lnra�W e� Pressure Distibution �"°^s°^'�� '"'""`•'•"� 3.a. Select number of perforated laterals 3 . b. Select perforation spacing= 3 feet ��,�C,�."'"° c. Subtract 2 h.from the rock layer length. ��-2 ft._�feet d. Deternune the number of spaces between perforations. Length perf.spacing=;�,Et.+ 3 ft.__J._�spaces Required Perforation Discharge e. �_spaces+1= ��-J, perforations/lateral u+gauocu per minute(gpnj f. Multiply perforadons per lateral b number of laterals to D H d8e �2 m�,�,, i�d� get total number of perforadons.� x �„ ��_ �I � perforations. �f�c> g� �' X�'"'-�gp� 1.Oa 0.56 0.74 SELECTED PUMP CAPACITY 3 1 gpm 2.�b �.g� 1.�4 B.Determine head requirements: • a. Use for single family homes 1. Elevation difference between pump and point of discharge. b.Use for all other appluations �_feet 2. If pumping to a pressure distribution system,five feet for pressure required at manifold if gravity system,zero. S feet 3. Friction loss a. Enter friction loss table with gpm and pipe diameter. �Pe��8�► Read friction loss in feet per 100 feet from table. � • Poini of Dischar�� F.L= /_�_fG/100 ft of pipe _ �65.0. b. Determine total pipe length from pump to discharge pevation Difference� point. Add 25 percent to pipe length for fitting p„n,P �� loss,or use a fitting loss chart. Equivalent pipe length-1.25 times pipe length= F-l8b S.O x 1.25=��feet 1.5 inch 2.0 inch 3.0 inch c. Calculate total fricdon loss by multiplying �m Friaim 1«e per 100 ft of pipc friction loss in h/100 ft by equivalent pipe length. 10 0.69 0.20 Total friction loss= ,�x /. So +100= � feet 12 0.96 0.28 4. Total head required is the sum of elevation difference, 14 1.28 038 special head requirements,and total friction loss. 16 1.63 0.48 18 2.03 0.60 / 20 2.47 0.73 O.11 � + J + � 25 3.73 l.11 0.16 (1) (2) (3c) 30 5.23 1.55 0.23 35 7.90 2.06 0.30 40 11.07 2.64 0.39 TOTAL HEAD �_feet • 45 1a.73 3.28 0.48 50 3.99 0.58 55 4.76 U.70 C. Pump selection bo s.bo o.s2 1. A pump must be selected to deliver at least 3 L_gpm (Step A) with at least _j�_feet of total head(Step B).