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DR/SCOPIPE , <br />Simplified Burial Design: A conservative estimate of <br />the ability of Driscopipe pipelines to perform in a <br />buried environment is found in Chart 24. It is based <br />on a minimum 2:1 safety factor and 50 year design <br />service life. A detailed burial design starts on page <br />37. The detailed design should be used for critical or <br />marginal applications or whenever a more precise <br />solution is desired. <br />Detailed Burial Design: <br />Design by Wall Crushing: Wall crushing would <br />theoretically occur when the stress in a pipe wall, due <br />to the external vertical pressure, exceeded the long- <br />term compressive strength of the pipe material. To <br />ensure that the Driscopipe wall is strong enough to <br />endure the external pressure the following check <br />should be made: <br />SA - (SDR -1)PT <br />2 <br />36 <br />E' (psi) for Degree of <br />Soil Type of <br />Compaction <br />(Proctor Density, <br />%) <br />Initial Backfill <br />Embedment <br />Loose <br />Slight <br />Moderate <br />High <br />Material <br />Description <br />(70-851/6) <br />(85-950/6) <br />(95%) <br />I <br />Manufactured angular, granular <br />1,000 <br />3,000 <br />3,000 <br />3,000 <br />materials (crushed stone or rock, <br />broken coral, cinders, etc.) <br />II <br />Coarse grained soils with little or <br />N.R. <br />1,000 <br />2,000 <br />3,000 <br />no fines <br />III <br />Coarse grained soils with fines <br />N.R. <br />N.R. <br />1,000 <br />2,000 <br />- IV <br />Fine-grained soils <br />N.R. <br />N.R. <br />N.R. <br />N.R. <br />V <br />Organic soils (peat, muck, clay, etc.) <br />N.R. <br />N.R. <br />N.R. <br />N.R. <br />N.R. = Not Recommended for use by ASTM D2321 for pipe wall support <br />Chart 24 <br />Maximum <br />Burial Depth, ft. Maximum <br />External <br />Maximum <br />Deflection, % <br />in dry soil of 100 lbs/cu. ft. Pressure psi <br />after installation <br />SDR <br />Soil Modulus, psi* Soil Modulus, <br />psi* <br />Soil Modulus, psi* <br />1000 <br />2000 3000 1000 <br />2000 <br />3000 <br />1000 <br />2000 <br />3000 <br />32.5 <br />25 <br />32 37 17 <br />22 <br />26 <br />1.7 <br />0.9 <br />0.6 <br />26 <br />33 <br />45 52 23 <br />31 <br />36 <br />2.3 <br />1.2 <br />0.8 <br />21 <br />46 <br />61 71 32 <br />42 <br />49 <br />3.2 <br />1.6 <br />1.1 <br />19 <br />52 <br />69 81 36 <br />48 <br />56 <br />3.6 <br />1.8 <br />1.2 <br />17 <br />61 <br />121 181 42 <br />84 <br />126 <br />4.2 <br />2.1 <br />1.4 <br />15.5 <br />56 <br />112 168 39 <br />78 <br />117 <br />3.9 <br />2.0 <br />1.3 <br />13.5 <br />49 <br />98 147 34 <br />68 <br />102 <br />3.4 <br />1.7 <br />1.1 <br />11 <br />39 <br />78 117 27 <br />54 <br />81 <br />2.7 <br />1.4 <br />0.9 <br />9.3 <br />33 <br />68 101 23 <br />47 <br />70 <br />2.3 <br />1.2 <br />0.8 <br />8.3 <br />30 <br />61 89 21 <br />42 <br />62 <br />2.1 <br />1.1 <br />0.7 <br />7.3 <br />26 <br />52 79 18 <br />36 <br />55 <br />1.8 <br />0.9 <br />0.6 <br />-._ - *assumes no external bads <br />46 <br />36 <br />