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11 <br />UG TANK BUOYANCYIRESTRAINT CALCULATIONS Date: 12/22/98 <br />Proj: DSS <br />PN: 21901.00 <br />(1) 20.000 GALLON TANK <br />DESIGN PARAMETERS: <br />h=HC+D <br />h=4.50+10.00 =14.50 ft. <br />a=h*SRS <br />a=14.50"0.25=3.63 ft. <br />End area of backfill (A) <br />A=(D+a)*h <br />A = (10.00 + 3.63) * 14.50 = 198 sq.ft. <br />AS=(D+(2*a))*(L+(2*a)) <br />AS = (10.00 + (2 * 3.63)) * (37.00 + 2 * ( 3.63)) = 763 sq.ft. <br />VPG = (198 * 37.00) - (2906 +(1 * 43) + 376) = 3985 cu.ft. <br />WPG = (3985 * (120-62.4) / 1,000 = 230 kips <br />WDM = (CDQ * CDH * CDL * CDW) * (RC - 62.4 Ib./cu.ft.) / 1,000 Ib./kip <br />WDM = (2 * 1.00 * 37.00 *1.00) * (150 - 62.4)) / 1,000 = 6.48 kips <br />HOLD DOWN FACTOR (HD) - CASE 2 <br />HD = HDF / BF <br />HD=(277/184)=1.51 <br />1.51 > 1.20 ... Hold down force is sufficient. <br />Helmick and Lerner Inc <br />