Laserfiche WebLink
G"t0 <br /> PRESSURE DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals 3 <br /> 2. Select perforation spacing = 3 ft. <br /> 3. Since perforations should not be placed closer than 1 ft. to <br /> the edge of the rock layer (see p. E-14), subtract 2 ft. from the <br /> rock layer length. <br /> (,,,, Y -2ft. = L, L, ft. <br /> Rock i.ytr la,gth <br /> 4. Determine the number of spaces between perforations. <br /> Divide the length above by perforation spacing and round E-17a <br /> down to nearest whole number. <br /> • • a � <br /> 'F•L. r•, .: • . ul <br /> Head Perforation diameter(inches) <br /> Length perf. spacing = � ft. + 3 ft. = ,), spaces 7/32 1/4 <br /> (3) (2) 1.0a 0.56 0.74 <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.0b 0.80 1.04 <br /> perforation spaces . a 0 0.89 1.28 <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> D spaces + 1 = ,D. 3 perforations/lateral aUse 1.0 foot of head for residential systems. <br /> bUse 2.0 feet of head for other establishments <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> _, _ a. - w.i.ar..l.ra...l�ri.c�pdari�}tNNW w <br /> perforations. .•di•- ` <br /> lateral. x perfs/Iataal= Ch.1) 125 inch 1S inch 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Determine required flow rate by multiplying 3.0 13 17 26 <br /> number of perforations by flow per perforation a 0 11 15 23 <br /> (see page E -17) 5.0 10 14 22 <br /> X132 vvp . • <br /> pf X / = 2__ gpm. E-15 <br /> W.R!larale R 011 I PIOK I1111II11/101 frnW <br /> 8. If laterals are connected to header pipe as shown on page E- - No- <br /> 15, select minimum required lateral diameter from table on <br /> page E-17; enter table with perforation spacing and number ,0.""'''' <br /> of perforations per lateral. Select minimum diameter for \„,, '' <br /> perforated lateral = inches. <br /> E-12 <br /> ,.....4,==.2 r=1... <br /> 9. If perforated lateral system is attached to manifold pipe near :r �__ <br /> the center, as on page E-12, perforated lateral length and z& �'' <br /> number of perforations per lateral will be approximately one <br /> Tim= <br /> half of that in step 8. Using these values, select minimum .._ . <br /> diameter for perforated lateral from page E-17 as 1 'I a '''' `_'r... <br /> inches. <br />