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I , F-17
<br /> :�
<br /> ;��,�' PUMP SELECTION PROCEDUR�
<br /> �END PERFORATION OF A PERFORATED �ATERAL
<br /> A. Determine pump capacity: �•a.�...
<br /> Gravity Distribution T.,.,,, ���;,
<br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of _ ::. � . � a c..»„�.�e,k���p„
<br /> water use rate. .`°"'"5a°`"" `�� �,`.,;,°'cwwid
<br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 ., . ►�+�•��a��»���=����h
<br /> .,»C�O W.e, ToP
<br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ...,;�,,„ '_., �.,„ ,2•„Ed9e
<br /> la st R«t Lq«
<br /> � .... ._. � Rrleralens LacstM at
<br /> Pressure Distibution �� ��+��� �""^"�"""
<br /> 3.a. Select number of perforated laterals 3 .
<br /> ono.w+sen rr.o.r+r sco�n.e
<br /> b. Select perforation spacing= � feet �,�.p,,,,,,5,,,,�,,.,
<br /> c. Subtr ct 2 ft from the rock layer length.
<br /> ��-2ft.= `' _feet
<br /> d. Det rnune the number of spaces between perforations.
<br /> Length perf.spacing=;�ft.+ � ft._,L2 spaces Requited Perforation Disch e
<br /> e. �spaces+1=��perforations/lateral ' ��o�p��,�re(gp�
<br /> f. Multiply perforations per lateral by number of laterals to �`�"�8e , �a ,
<br /> Z � Head �Z w� 4 aa,�r
<br /> get total number of perforations. ,��,,,� x �,-�-;�a,,_�_perforations. �f��>
<br /> g. s�,`� X���= '--�-� gP�• 1.Oa 0.56 0.74 .
<br /> SELECT'ED PUMP CAPACI'TY�a 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 /> �_feet
<br /> r��� 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. �p�L�g�
<br /> Read friction loss in feet per 100 feet from table. � Point of Discharge
<br /> F.L._ �.��I ft./100 ft of pipe s
<br /> b. Determine total pipe length from pump to discharge Ele�ation Differcnce�
<br /> point. Add 25 percent to pipe length for fitting p�P ��a
<br /> loss,or use a fitting loss chart. Equivalent pipe
<br /> length-1.25 times pipe length= F-18b
<br /> 13� x 1.25=J L3 feet
<br /> c. Calculate total friction loss b muld 1 n 1.5 inch 2.0 inch 3.0 inch
<br /> Y P Yi S g� FriaSa+lm pv 100 fl of pipe
<br /> friction loss in ft/100 ft by equivalent pipe length.
<br /> Total friction loss= � .�y x /(�� +100= feet 10 0.69 0.20
<br /> -�-�'-- 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 0.48
<br /> 18 2.03 0.60
<br /> 20 2.47 0.73 0.11
<br /> �_+�+�_ 25 3J3 1.11 0.16
<br /> (1) (2) (3c) 30 5.23 1.SS 0.23
<br /> 35 7.90 2.06 030
<br /> 40 11.07 2.64 0.39
<br /> TOTAL HEAD a a feet � 45 14.73 3.28 0.48
<br /> 50 3.99 0.58
<br /> C. Pump selection ss 4.76 0.�0
<br /> 6o s.6o o.s2
<br /> `',s 1. A pump must be selected to deliver at least
<br /> r.;.::,
<br /> >�;z�'
<br /> � p gpm (Step A)with at least �a feet of total head(Step B).
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