|
PUMP SELECTION PROCEDUR[:
<br /> A. Determine pump capacity:
<br /> Gravity Distribution ENO PERFORATION OF A PERFORATED LATERAL
<br /> l. Minimum su�ested is 6(�gallons per hour(10 gpm)to stay ahead of ��„u�,�.,
<br /> water use rate. -'`�--'--� �-
<br /> Top�oil
<br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,7(H) 4 `. -�:--- ,
<br /> ,LayN of Geonxtile FaDrlc(a far•
<br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. . �a,,,,y sa�e,�,,�, ,,,�h,,ri.,,,�y„.,,�,��,�.,
<br /> .• . . ��� rith red rocin papn)
<br /> er wg,� ;. g�ern�.. . ' -Perbwlion Wlll�d fla�ronlally
<br /> Pressure Distribution
<br /> �`• '�•• .,' Inlo G D Nea� Top
<br /> 3. a. Select number ofnf+rforatcd laterals �'�:rw. � ��;�-A� L�as� �z•�o�a,�
<br /> Y` �1;Qroin FIaIA.RxY, ._ ,,.,.;� ol Rock layer
<br /> b. Select perforation spacing= ft. ` __P,,,wo,+�„��,��,Ma o�
<br /> c. Subtract 2 ft.from thc rock laycr len�th. u.a�sa�e ur., Bo�mm ol Lolval
<br /> Y�, �� -2 ft.= ft.
<br /> aamoi sou wo�i�sw��rw
<br /> Before PI«inp Sond Layer
<br /> d. Determine the numbcr of spams betwcen perforations.
<br /> Length perf.spacing= ft.+ ft.= spaces TABI.F.OP PGRI�ORATION UlSC1lARCPS IN CI'M
<br /> e. spaces+ 1 = perforations/latcral
<br /> ' f. Multiply perforations per lateral by number of laterals to xc,a Pcrforationdiameter(inches)
<br /> get total number of perforations. --
<br /> x - p�+rforations. ��" ��'
<br /> 1�fs s tenl C' -
<br /> �.�3 �.� 0.74
<br /> X SPm• z.ob a so i.o�a
<br /> S' �er(s gTperf
<br /> 2.5 0.89 1.17
<br /> � 3.0 0.98 I.28
<br /> SELECTED PUMP CAPACITY gpm a.o t.13 t.a�
<br /> 5.0 1.26 1.65
<br /> B.Determine head requirements:
<br /> 1. ElevaHon difference between um and �nt of dischar e. aUse7.0 foot of head for residential systems.
<br /> P P � � bUse 2.0 feet of head for othcr establishments
<br /> /� feet
<br /> 2. If pumping to a pressure distribution system,add five feet for pressure
<br /> required at manifold �
<br /> S feet
<br /> 3. FriCtion loss � Pipe Length t
<br /> a. Enter friction loss table with gpm and pipe diamctcr. Poinc of Discharge
<br /> Read friction loss in feet per 100 fect from table.
<br /> F.L._ �S s ft./100 ft of pipe Elevation Difference
<br /> b. Determine total pipe length from pump to discharge p„mP
<br /> point. Add 25 percent to pipe length for fitting
<br /> loss,or use a fitdng loss chart. Equivalent pipe F-18b
<br /> length-1.25 Hmes pipe length=
<br /> I �P O x 1.25= zd� fect s�m l.�iaC����r ioo n o[3.O inch
<br /> P Ix
<br /> c. Calculate total friction loss by multiplying 10 0.69 0.20
<br /> friction loss in ft/100 ft by equivalent pipe le»gth. 12 0.96 o.2A
<br /> Total friction loss= Z,��x(�f�+l(H)_ � feet 14 1.28 0.38
<br /> 4. Total head required is the sum of elevation diffcrcnce, 16 1.63 0.48
<br /> s ial head uirements,and total friction loss. 18 2.03 0.60
<br /> P� �l 20 2.47 0.73 0.11
<br /> 3.73 0.16
<br /> �_+ � +�_ 3 5.23 .55 0.23
<br /> 35 7.90 0.30
<br /> (1) (2) (3c) 40 11.07 2.64 0.39
<br /> 45 14.73 3.28 0.48
<br /> TOTAL HEAD ��feet 50 3.99 0.58
<br /> 55 4.76 0.70
<br /> 60 5.60 0.82
<br /> �. Pump selection
<br /> 1. A pump must be selected to deliver at least�gpm (Step A)
<br /> with at least,�feet of total head (Step B).
<br />
|