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C <br />[.7 <br />Shaw Environmental, Inc. <br />NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL, MODULE 3 <br />CHECK OF EXISTING LEACHATE COLLECTION PIPES <br />USING THE IMPROVED PIPE LOADING CALCULATION <br />D. Pipe Buckling <br />Acceptable factor of safety = <br />The critical buckling pressure, P,, in psi, is given by, <br />Y2 <br />P. =0.55 M. EP *I <br />0.149R3 <br />Therefore, factor of safety (FS) against pipe buckiling, <br />Unit Initial Long -Term Note <br />Pc.r (psi) 519 222 <br />6i (psi) 117 74 - <br />FS = P,,Icy - 4.42 2.99 F.S. is Acceptable <br />E. Wall Crushing <br />Acceptable factor of safety = F777:� <br />Ignoring bendin-, the axial stress PSA in psi is given by, <br />PSAI 91 <br />2AW <br />Therefore, factor of safety (F.S.) against wall crushing, <br />Unit Initial <br />Long -Term Note <br />PSA (psi) 852 <br />539 - <br />PA (psi) 3000 <br />1440 - <br />FS = PAIPsA - 3.52 <br />2.67 F.S. is Acceptable <br />N:\GEOTECHNICAL\NCRC&SL-2007\Pipe-Loading\Module 3\Module3_41nchPipe_ImprovedMethod_165ft.xlx <br />Page 5 of 6 <br />