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i· <br />PRESSURE DISTRIBUTION SYSTEM· <br />1. Select number of perforated laterals _...,..$.-::;.. __ _ <br />2. Select perforation spacing= __ S=--'-feet <br />3. Since perforations should :r:iot be placed closer than 1 ft. to <br />the edge of the rock layer (see diagram), subtract 2 ft. from <br />the rock layer length: <br />. lee> . q8 <br />. o.c.t.•-l th,.. zft. = . feet <br />. ,v.,u. w.yer eng <br />4. Determine the number of spaces between perforations. <br />Divide the length above by perforation spacing and round <br />do-wn to nearest whole number. <br />r <br />Length perf. spacing= q 8 ft. -:-5 ft. = 2° spaces <br />. · (#3) . (#2) <br />S. Number of perforations is equal to one plus the number of <br />perforation spaces . <br />2o spaces+ 1 = 2--i perforations per lateral <br />6. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. <br />'-'' ...... _ .. -··---· -- <br />• ... Al L.0..1 12.• ro Edq• <br />~~~~~.,,..,..,._._.....:.::·"";,:.:-iiii" ol R4C>t tAyff <br />,.:• · Pvfotati~··Locot,ed 01 -~--Clean ~ u'ycr Bolton, of t..ate1"0.f. <br />~1 ~;q~=~•:11 ~:;;y ·s:,;;l•d ~ <br />Belo,. Pfod"9 S<Jnd Layer <br />TABLE OF PERFORATION DISCHARGES lN GPM <br />Head Perforation di.imeter (inches) <br />'!~ 'I. <br />1.0a 0.56 0.74 ( <br />1.5 0.69 0.90--- <br />2.0b 0.80 1.04 <br />2.5 0.89 1.17 <br />3.0 0.98 1.28 <br />4.0 1.13 1.47 <br />5.0 1.26 1.6.5 <br />a Use 1.0 foot of head for residential systems. <br />bUse 2.0 feet of head for other establishments <br />Table 2 <br />3 -Z.\ 1.3 f . <br />~s X p<!ds/latera.l = _<4/_. ____ per orations M:iximum allowable number of qu:iLer inch perforations per <br />l:itenl to iuannt,,e<lOS Di.sch:ar-,;ie V2nalion <br />perlonU-:,pa<lnc <br />. (roed) <br />7. Determine required flow rate by multiplying <br />number of perforations by flow per perforation <br />&~ x~;~=_11gpm. -- <br />8. :. If later_als are connected to header pipe as shown on upper <br />exa.mple,,select minimum required lateral diameter from <br />table 2; enter table with perforation spacing and number <br />of perforations per lateral. Select minimum diameter for <br />perforated lateral = ___ inches <br />2.5 <br />3.0 <br />3.3 <br />4.0 <br />5.0 <br />9. If perforated lateral system is attached to manifold pipe near <br />the center, as in lower example, perforated lateral length and <br />number of perforations per lateral will be approximately one <br />half of that in # 6. Using these values, select minimum <br />diameter for perforated lateral from table 2 <br />perforat~ lateral= /;'S · · incites <br />',-("". <br />1.25 inch I 1.5 inch 2.0 inch <br />14 18 28 <br />13 17 26 <br />12 16 25 <br />11 15 23 -.. 10 14 22