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Simplified Bulial Design: A conservative estimate of Detailed Burial Design: the ability of Driscopipe pipelines to perform in a Design by Wall Oushing. Wall crushing would buried environment is found in Chart 24.It is based theoretically occur when the stress in a pipe wall,due on a minimum 2:1 safety factor and 50 year design to the external vertical pressure,exceeded the long- service life.A detailed burial design starts on page term compressive strength of the pipe material.To 37.The detailed design should be used for critical or ensure that the Driscopipe wall is strong enough to marginal applications or whenever a more precise endure the external pressure the following check solution is desired. should be made: SA - (SDR -1)PT 2 Values of E' Based on Soil Type(ASTM D2321)and Degree of Compaction E'(psi)for Degree of Soil Type of Compaction(Proctor Density,%) Initial Backfill Embedment Loose Slight Moderate Nigh Material Description (70-85%) (85-950/®).(95%) I Manufactured angular, granular 1,000 3,000 3,000 3,000 materials(crushed stone or rock, broken coral, cinders,etc.) I! Coarse grained soils with little or N.R. 1,000 2,000 3,000 no fines III Coarse grained soils with fines N.R. N.R. 1,000 2,000 IV Fine-grained soils N.R. N.R. N.R. N.R. V Organic soils{peat, muck, clay,etc.) N.R. N.R. N.R. N.R. N.R. = Not Recommended for use by ASTM 171321 for pipe wall support Chart 24 Maximum Burial Depth,fL Maximum External Maximum Deflection,% in dry soil of 100 lbstcu.ft. Pressure psi after installation SDR Soil Modulus,psi* Soil-Modulus,psi* Soil Modulus,psi* 1000 2000 3000 1000 2000 3000 1000 2000 3000 32.5 25 32 37 17 22 26 1.7 0.9 0.6 26 33 45 52 23 31 36 2.3 1.2 0.8 21 46 61 71 32 42 49 3.2 1.6 1.1 19 52 69 ' 81 36 48 56 3.6 1.8 1.2 17 61 121 181 42 84 126 4.2 2.1 1.4 15.5 56 112 168 39 78 117 3.9 2.0 1.3 13.5 49 98 147 34 68 102 3.4 1.7 1.1 11 39 78 117 27 54 81 2.7 1.4 0.9 9.3 33 68 101 23 47 70 2.3 1.2 0.8 8.3 30 61 89 21 42 62 2.1 1.1 0.7 7.3 26 52 79 18 36 55 1..8 0.9 0.6 *assumes no eAemal bads _ 36