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<br /> F-17
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<br /> ' PUMP SELECTION PROCEDURE
<br /> Fj�D PERFORATION OF a PERFORaTED L4TER4l
<br /> a Determine pump capacity: �....�...,
<br /> Gravity Distribution T.,,.,,
<br /> l. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of ' ��„N�w�,k�d��.�
<br /> water use rate. .'""'s"°""' �"""'."'"''.",°'""^°
<br /> �.��.�.,...,,.e...�
<br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 „ , �M•��a����������",
<br /> MN(yy Wa� Tw
<br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ,,,.hw�� ,;_�p«���,Eao.
<br /> Pressure Distibution `c�..�5.�.�.,,. ��'"`"�~��
<br /> M�yw N U�.ni
<br /> 3.a. Select number of perforated laterals 3 ,
<br /> onw�r s.n ►W..r su��w
<br /> b. Select perforation spacing=�_.feet ,,,,,..w,M�,,,��,,,
<br /> c. Subtrad 2 h.from the rock layer length.
<br /> ���-2ft.=�_feet
<br /> d. Determuie the number of spaces between perforaHons.
<br /> I,ellgth �eif.SpdCiilg=�ft.+�ft._�_spaces Requiied Peskntlon Disch e
<br /> e. �spaces+1=_��perforadons/lateral u,g.uo�per a,;:,�ce�gp�
<br /> f. Muldply perforadons per lateral by number of laterals to D;�clu�e , , ,
<br /> get total number of perfontions. W-�; x �,,, �Q,,_�_perforations. H�j �2' � ' '�d°`�
<br /> g� � X��_�gp� Z.Oa 0.56 0.74
<br /> SELECTbU PUMP CA.PACTIY�(�gpm 2.�b 0.80 1.04
<br /> B.Determine head requirements: a. Use for single family homes
<br /> i. Elevadon difference between pump and point of discharge. b. Use for all other applications
<br /> �_feet
<br /> � 2. If pumping to a pressure distribudon system,five feet for pressure
<br /> mquired at manifold if gravity�stem,zero.
<br /> .s feet
<br /> 3. Friction loss
<br /> a. Enter friction loss table with gpm and pipe diameter. Rp��-�+g�h
<br /> Read friction loss in feet per 100 feet from cable. � Poin�of D�schargc
<br /> F.t. _ �.1��ft./100 ft of pipe �oy
<br /> b. Dete�rsune total pipe length from pump to discharge Ele�aoon Differrncc
<br /> poinL Add 25 percent to pipe length for fitting �p �r�
<br /> loss,or use a fitting loss chart. Equivalent pipe
<br /> length-1.25 dmes pipe length= � F-18b
<br /> 1�_xt.25 = a�J feec
<br /> c. Calculate toG�l friCtion]oss b multi l n 1.5 inch 2.0 inch 3.0 inch
<br /> Y P Y� g gp�, �+;a�ta.�i oo n oc Pca
<br /> friction loss in ft/100 h by equivalent pipe length.
<br /> Total fricdon loss= f. x aaS +100= C.� feet 10 0.69 0.20
<br /> a• y 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 fricdon loss. 16 1.63 O.a8
<br /> I8 2.03 0.60
<br /> 20 2.47 0.73 0.1I
<br /> �_+ ,S' +_� 25 3.73 1.11 0.16
<br /> (1) (2) (3c) 30 5.23 1.55 0.23
<br /> 35 7.90 2.06 0.30
<br /> 40 11.07 2.64 0.39
<br /> TOTAL HEAD .�_feet 45 14,73 3.28 O.a8
<br /> 50 3.99 0.58
<br /> 55 4.76 0.70
<br /> C. Pump selection bo s.6o o.a2
<br /> ; 1. A pump must be selected to deliver at least
<br /> ,_:� �i.„�gpm (Step A) with at least ,�,_feet of total head (Step B).
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