|
p�JMP SELECTION PROCEDLIRE
<br /> A. Determine pump capacity: .
<br /> Cravity Dlstribution END PEIiFORATiON OF A PERFORATED IATERA�
<br /> ]. Minimum su�ested is 600 gallons per hour(]0 gpm)to stay ahcad of ra.w aw,
<br /> water use ratc. . . � � '
<br /> Teo.a� �� �
<br /> 2. Maximum suggested for delivery to a drop box of a homc system is 2,700 •r� �. .
<br /> . .LeP�N aN„�IN iaork(«►wr-
<br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. : � �.«�s.w�.,,, %",,,,,�,.y.,«,,s,,.,,,,.,,�,,,.,.,
<br /> -��-�.��,,..r'+-�.�M�r«I^...n�
<br /> Pressure Distributlon �,«��os;,,.,�i�. � -M�M p�aM�a«u.��N�,
<br /> ,;�. .
<br /> 3. a. Sclect number oE perforated laterals �,�' � �'' '
<br /> �L) L 1?�.� � . i A Ww �A1 L�1 12'1�EdN
<br /> b. Select rforation s acin ft. , �����N� pK • �•� �•�
<br /> � p Fi-� �-f"ra �•. �. '� � . C�,•, ��rlwe�wm lae�N�t
<br /> c. Subtract 2 ft.from thc mck laycr lcn�th. �� r , _ , ; � c�b�s�+e�,.� �•���^•� �•�•�N
<br /> ��,-�•2 ft.= ft. ,'.' ', �;' - �
<br /> ` . aqies�s.n hsOnly Sear111N
<br /> Ik�en p1o�Mq SeM Le�m
<br /> d. Detcrmine the numbcr of spaces betwcen perforations.
<br /> Length perf.spacing= _ft.+ ft.= spaccs T/►�LE OT PGRia01tATION DISC}IARCCS 1N CPM
<br /> c. spaccs+ l = perforations/latcral
<br /> ' f. Multiply perforations per lateral by number of later,�ls to Hcad Pcr(orationdiameter(inchca)
<br /> get total numbcr of perforations.
<br /> ,.,,. x . ,mi= perforations. ��" _��'
<br /> c'T
<br /> i.Os O.SG 0.71
<br /> S' r«r• X R'�v�+= 3q gp'n• zot► o�eo i.a
<br /> 25 0.89 1.17
<br /> SELECTED PUMP CAPACITY "�_gpm �p �,�3 147
<br /> 5.0 1.26 1.65
<br /> B.Determine head requirements:
<br /> 1. Elevallon diffcrence betwcen um and int of dischar e. sUse 1.0 foot o(l+esd for resldenti�l syste�.
<br /> P P P� S bUse 2A teec ot he.d tor ahcr escAblishoxnts
<br /> �� �.� feet
<br /> 2. If pumping to a pressure distribution system,add fivc fert for pressure
<br /> required at manifold
<br /> � feet
<br /> ..�
<br /> 3. Friction loss Pipc Length
<br /> a. Enter fricHon loss table with gpm and pipe diameter. � Point of Dischargc
<br /> Read friction loss in feet per]00 Eeet from tablc. 9 d.��
<br /> F.L.= a . l� ft./100 ft Of pipe Elevaticm Di[fcrcnce
<br /> b. Determine total pipe length from pump to dischargc �,�,,P �� ,.
<br /> point. Add 25 percent to pipe len�th for fitting
<br /> loss,or use a fitting loss chart. Equivalent pi}x� F-I8b
<br /> 1Cngth-1.25 times pipe length= 1.5 inch 2.0 inch 3.0 inch
<br /> .� r X�.�=_ f�j O fCCt s�m Frialan 1or pa too fl of M�e
<br /> c. Calculate total friction loss by multiplying �o 0.69 0.20
<br /> friction loss in ft/l00 ft by equivalcnt pipe length. 12 0.96 0.28
<br /> Total friction loss=' :�. (,. x 1 S �'� +10O_�,feet 14 1.28 0.38
<br /> 4. Total head required is the sum of elcvati�n diffcrencc, 16 1.63 0.48
<br /> special head requirements,and total friction loss. 18 2.03 o.bo
<br /> 20 2.47 0.73 0.11
<br /> 25 3.73 1.11 0.16
<br /> _� („`+ S� ' '+ �- 30 5.23 1.SS 0.23
<br /> (1) (2) ':13c) 35 7.90 2.06 0.30
<br /> 40 11.07 2.641 0.39
<br /> 45 14.73 3.28 0:48
<br /> TOTAL HEAD �y 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�S feet of total head (Step B). .
<br />
|