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<br /> F-17
<br /> PUMP SELECTTON PROCEDURE
<br /> • END PERFORATION OF A PERFORATED L4TERAL
<br /> A. Determine pump capacity:' Wa..�.,
<br /> Gravity Distribution
<br /> Top�o11
<br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of - • - � ��M���k��,�.
<br /> �.-.�oamr su,e WK �'�wr.>i nor«n,e.cw..w
<br /> water use rate : . .,,�,,,,,,�,,,,,,,
<br /> ' F�..r_-...�
<br /> 2. Maximum�_.� �,r.=*_�.� ��r delive.y to a drop box of a home system is 2,700 �,� ,��� ��„�����«�_�^�����
<br /> galions per hour(4�gpm)to prevent build-up of pressure in drop box. ��,.�,,„ � '_.,��,., ,Z•„_�,.
<br /> o FMId of ttoca Lq«
<br /> Wtaerlar Lxo�W ai
<br /> Pressure Distibution �,.d,s,,,,,,,,, ao��a�er..�i
<br /> 3.a. Select number of perforated laterals 3 ,
<br /> . .plyind Sell PrqMy Sco1/Na
<br /> b. Select perforation spacing= 3 feet �,,,,,„�„��„��,,,,
<br /> c. Sub 2 ft from the rocic layer length.
<br /> ��-2 ft.= 5 3 feet �
<br /> d. Deternune the number of spaces bet�veen perforations.
<br /> Length perf.spacing=�ft.+ 3 ft.__),_'Z spaces tt�quired Perforation D�schazge
<br /> e. �_spaces+ 1 =��perforations/lateral ������ce�SP�)
<br /> f. Multiply perforations per lateral by number of laterals to ��e � m�� ��d�
<br /> get total number of perforations. ,���� x �� ��_��perforations. (feeU 3Z °
<br /> �' � X a� v�-�� gPm.
<br /> 1.Oa 0.56 0.74
<br /> SELEC'TED PUMP CAPACITY�0 gpm 2.�b �.g� 1.�4
<br /> B.Determine head requirements: a. Use for single family homes
<br /> 1. Elevation difference between pump and point of discharge. b.Use for all other applications
<br /> I,e� feet
<br /> 2. If pumping to a pressure distribution system,five feet for pressure
<br /> required at manifold if gravity system,zero.
<br /> � ��feet
<br /> 3. Friction loss '
<br /> a. Enter friction loss table with gpm and pipe diameter. Pipe Leng�h
<br /> Read friction loss in feet per l00 feet from table. � Point of Ducharee
<br /> F.L._ �.':'a ft./100 ft of pipe Tlp�a .j
<br /> b. Determine total pipe length from pump to discharge Ele�aaon Difference�
<br /> point. Add 25 percent to pipe length for fitting �P I �;.. . �
<br /> loss,or use a fitting loss chart. Equivalent pipe �
<br /> length-125 times pipe length= F-18b
<br /> J`1 v x 125= a3 `� feet
<br /> c. Calculate total friction loss by multi Ivin 1.5 inch 2.0 inch 3.o inci,
<br /> p, g �m Friaim loes per 100 ft of pipc
<br /> friction loss in ft/100 h by equivalent pipe length.
<br /> 10 0.69 0.20 �
<br /> Total friction loss= �.(. x a 3!� =1Q0= � feet 12 0.96 0.28 �
<br /> 4. Total head required is the sum of elevation difference, 14 1.28 0.38 �
<br /> special head requirements,and total friction loss. 18 2.03 0.60 ' i
<br /> ,/ Zo Z.a� 0.�3 0.i� �
<br /> �(�+ J +� 25 3.73 1.11 0.16 �
<br /> (1) (2? (3c) 30 �.23 1.5� � 0.23 �
<br /> 3� 7.90 2.06 � 0.30 i
<br /> 40 11.07 2.6-1 0.39 �
<br /> TOTAL HEAD �_feet 45 �a.73 3.23 0.�k :
<br /> �0 3.99 O.�S i
<br /> �5 4J6 OJO !
<br /> C. Pump selection bo s.bo o.s2 ;
<br /> � �
<br /> � 1. A pump must be selected to deliver at least
<br /> �O_gpm (Step A) with at least � feet of total head (Step B).
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