Laserfiche WebLink
• <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution ENO PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of .0.-"ms t.ow <br /> water use rate. <br /> T.a.w <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 <br /> t q«M fluw.rw t S,*tr tw <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. : ' Lowy t .,,,�,,.,.,.,,,.,..,,�..,... <br /> u,. r.d.raw) <br /> _ re r«.Il..arra b o..mr.rr <br /> �sqr Jt'T �. Ma r Nss 7.a <br /> Pressure Distribution <br /> "1 • • al Law Ir r.tees <br /> 3. a. Select number of perforated late is % ►� <br /> r..«t FNS Pet �. •�., NMust�y+ <br /> Must . <br /> b. Select perforation spacing= ft. Port;„,,,,,,tames , <br /> c. Subtract 2 ft.from the rock layer length. <br /> ch .tisaLhr, Iwo.N 1..r.,.r <br /> ul 2ft.= : ft. -� <br /> lark Myer length' oriMd 5.11 Moody Sesent.e <br /> d. Determine the number of spacestween perforations. Wert MaimLiner <br /> pelf.spacing= 'c; ft. ' ft.= 1 �'. spaces TABLE OF PERFORATION DISCHARGES IN CPM <br /> e. I ' spaces+ I = /4 perforations/lateral <br /> ' f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. vv� <br /> i.;Mr. x p:r.,t�.rd= .--1 .. perforations. ' <br /> 1.Oa 056 0.74 <br /> u- nq -, I 13 0.69 0.90 <br /> p•rr• <br /> g. x s.T=` gPm. 2.Ob 0.80 1.01 <br /> 2.5 OB9 1.17 <br /> SELECTED PUMP CAPACITY T I gpm 4.0 13 1.287 <br /> 7 <br /> 5.0 1.26 1.65 <br /> __ B.Determine head requirements: aUse 1.0 foot of head for residential systems. <br /> 1. Elevation difference between punfp and point of discharge. bure 2.0 feet of head for other establishments <br /> ) -3 feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> feet <br /> 3. Friction loss Pipe Length <br /> I I <br /> a. Enter friction loss table with gpm and pipe diameter. Point of Discharg <br /> Read friction loss in feet per 100 feet from table. /C3 <br /> F.L.= /• � ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump 90 0 <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-in <br /> length-1.25 times pipe length: <br /> nc4? O x 1.25= /0 U feet g> 1.5 iictii k2.0 inch 3inch <br /> par taon�pps <br /> c. Calculate total friction loss by Multiplying � <br /> 10 0.69 0.20 <br /> friction loss in ft/100 ft by equivalentpipe length. <br /> 12 0.96 0.28 <br /> Total friction loss= I o o x 1- S" +100= 1 . S' feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> special1headrequirements,and total friction loss. 20 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> 13 + S + a30 5.23 1.55 0.23 <br /> (1) (2) (3c) .35 7.90 -7.06- 0.30 <br /> 40 11.07 2.64 0.39 <br /> 45 14.73 3.28 0:48 <br /> TOTAL HEAD .0 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 3 1 gpm (Step A) <br /> with at least .o feet of total head (Step B). • <br /> • <br />