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7 t*. <br />Simplified Burial Design: A conservative estimate of <br />the ability of Driscopipe pipelines to perform ln a <br />buriefl ehvironment ls found in Chart 24. lt is based <br />on a miniinum 2:1 safety tactor and S0yeardesign <br />service li{e. A detailed burial design starts on page <br />37. The detailed design should be used lorcriticalor <br />marginal applications orwhenever a more precise <br />solution is desired. <br />SoilType ot <br />lnitial tsackf0lE <br />Emhedment <br />Material <br />Sn= <br />Values of E' <br />Based on soilType (ASTM rzgz8) and Degrce of cdrnpastlon <br />crushing would <br />occurwhen stress in a PiPtl wall, due <br />vertical exceeded the long- <br />strengtlr the pipe materrial. To <br />rllis strong enoughtothe DriscopiPret <br />externalpressu the following r;heek <br />rnade: <br />E'(psl)Degree eif <br />l-oose Moderate <br />'fl,000 3,000 3,000 <br />2,000 3,000IN,H. <br />N.R. <br />N.R. <br />Nt"Fr. <br />Deflerctlon, % <br />Detailed <br />Design <br />to the <br />terrn <br />ensure <br />endure <br />should <br />rialDesign: <br />WallCrushing: <br />ll <br />ilt <br />IV <br />Manufactured angular, granular <br />rnaterials (crusfred stone or rock, <br />broken coral, cinders, etc.) <br />Coarsel grained soils with little or <br />no nnes <br />Coarse grained soilswith fines <br />Fine-grained soils <br />x,000 <br />N.R" <br />Nl.Fl" <br />after Installatlon <br />2000 3000 <br />NI, <br />NI, <br />f\l , <br />2,000 <br />N.R" <br />N.R.Organic soils'(peat, mucl<, clay, etc.) <br />N.R. = [\ot Ftecommended for us€ by ASTM O2321 fot ppe urall $trppon <br />Chartil4 <br />lvlaxEnnurn Furial Depth, ft. <br />in dry s,qil of 1S lhs/cu" tt". <br />SDR 9olWg.4ulus, P.si.. <br />1000 2000 3000 <br />Maxlmum ExtBrnal <br />Press.ul€ Ps[ <br />1000 2000 3000- Soil:MoglulusJ PSI* -lriodu <br />32.5 <br />26 <br />21 <br />,19 <br />4att <br />15.5 <br />13,5 <br />11 <br />93 <br />8,3 <br />7.3 <br />33 <br />46 <br />52 <br />61 <br />56 <br />49 <br />ao <br />33 <br />30 <br />26 <br />45 <br />61 <br />121 <br />"tx2 <br />9B <br />7B <br />52 <br />71 <br />181 <br />x68 <br />147 <br />117 <br />101 <br />89 <br />79 <br />17 <br />23 <br />32 <br />36 <br />42 <br />eo <br />34 <br />27 <br />23 <br />21 <br />1B <br />26 <br />36 <br />49 <br />56 <br />126 <br />x17 <br />102 <br />81 <br />70 <br />62 <br />Aq <br />0.9 <br />1.2 <br />1.6 <br />1.8 <br />2,X <br />2.0 <br />1"7 <br />1.4 <br />1.2 <br />0.6 <br />0.8 <br />1,1 <br />1,2 <br />1.4 <br />1.3 <br />1.1 <br />0.9 <br />0.8 <br />0.7 <br />0.6 <br />25 32 37 22 <br />31 <br />42 <br />48 <br />B4 <br />78 <br />6B <br />54 <br />47 <br />42 <br />\10 <br />6B <br />ol <br />52 <br />aI <br />r.\4- <br />3 <br />a <br />4 <br />e <br />3 <br />7 <br />L1 <br />2 <br />69" 81 <br />rl <br />4 <br />7 <br />3 <br />36 <br />'assun'le$ no extemal krads