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� ,' , , p��SEL.ECTION PROCEDLm� '
<br /> �A. Determine pump capadty:
<br /> Gravity Dl�tribuHon oro aEaFORar�oN OF A PERFORATED IATERAL
<br /> l. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of �„��,w,
<br /> water use rate. T� ,I, �
<br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . .. .
<br /> ,. ,:�..:..
<br /> r;��;.�:::;i-.:. .,.:•,..;,•:�� a woratN�iaak(a�«r-
<br /> gallons per hour(45 gpm)to prevent build-up of prnssure in drop box. : �.�s.w,,w. ���",.r.,«►.,«�.�.e.�,««
<br /> �'',�.: :.M .,.w..o..
<br /> re.
<br /> v..�« ��aa�H,ra«uaM
<br /> Pressure Distrtbution • Mb v �«« ,►r
<br /> 3: a. Select number of perforated laterals �3 �ia r� � : � � ���.
<br /> b. Select perforation spacing=�_ft. ;=�t'y�'',:::'�: i:,-'.:.: �iwfaroll«w'��.�
<br /> c. Su tract 2 ft.from the rock la r len th. 'f ` c�saw,e„, ����u���
<br /> Ye � ��;�. :i
<br /> �� � -2ft.=�,�ft. �,�,�:,�,.:,�:: . :. .:.,.•�::•� :
<br /> 6iOrNMap�l�hpwlr fqrlM/
<br /> Sand LqK
<br /> ' d. Determine the number�of spaces between perforations.
<br /> Length perE,spacing a�ft.� 3 ft.��spaces TABLE OF PBRFiORATION DISCHARCFS W CpM(
<br /> e. _j,.�spac�s+1=�tL perforations/lateral
<br /> ' f. MulNply perforaHons per lateral by number of laterals to Head PerforaHon dlameter(inches)
<br /> t total nu�nber of perforations.
<br /> . � ,� �
<br /> �. x . �_��perforations. . s �•
<br /> � �.a � os6 oaa �
<br /> . 8• �X`--,,,,,�i-N-�_�gPm• 2 ob o.be90 t.a
<br /> 2.5 OB9 1.17
<br /> SELECTED PiJMP CAPACITY m 3.0 o.9e �Zg
<br /> - � � 8P �.o �aa t.4�
<br /> s.o �.a� �.�s
<br /> � B.Determine head requirements:
<br /> '�]. ElevaHondifferencebetween um and �ntofdischar e. aUsel.Ofooto(headforresidentlalsystems.
<br /> p p �. $ bUse 2.0 fcet of head for Mher establishmenb
<br /> i�'� feet
<br /> 2. 1f pumping to a pressure distribution system,add five feet for pr�ssure
<br /> required at manifold
<br /> .� feet �
<br /> 3. Friction loss p;pe L.cngch
<br /> a. Enter friction loss table with gpm and pipe diameter. � Point of D;scharge
<br /> Read friction loss in feet per 100 feet from table. ��
<br /> F.L._ " � � ft./]00 ft of pipe Elevation Ditfcrence
<br /> b. Determine total pipe length from pump to discharge �,P �,,
<br /> point. Add 25 percent to pipe length for fitting .
<br /> loss,or use a fitting loss chart. Equivalent pipe F-18b
<br /> length-1.25 Nmes pipe length= � 1.5 inch 2.0 inch 3.0 inch
<br /> ' ' ` x 1.?S= �-{�' feet g�,,,� F�ialon lou per 100 A of pipe
<br /> c. Calculate total friction loss by multipiying ' 10 0.69 0.20
<br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28
<br /> Totai friction]oss= : x � !i' +1pQ= �� feet 14 1.28 0.38 '
<br /> 9. Total head required is the sum of eicvation di(fcrence, 16 1.63 0.48 �
<br /> special head requirements,and lotal friction loss. 18 2.03 0.60
<br /> 20 2.47 0.73 0.11
<br /> ' � 25 3.73 1.11 0.16 .
<br /> 1�' + �' + :.a 30 5.23 1.55 O.Z3
<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 )e: fect , SO � 3.99 0.58
<br /> 55 4.76 0.70
<br /> 60 5.60 0.82 ' �
<br /> '�C. Pump selection .
<br /> 1. A pump must be selecied to deliver at least 3,1_gpm (Step�A)
<br /> with at least 1�� feet of total head (Step B).
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