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UG TANK BUOYANCY/RESTRAINT CALCULATIONS Date: 12/22/98 <br />Proj: DSS <br />PN: 21901.00 <br />(1) 6,000 GALLON TANK <br />DESIGN PARAMETERS: <br />VGS = (0.67 * 12.00 " 24.50) - (43 * 0.67 /4.50 * 1) = 189 cu.ft. <br />WGS = 189 * (150.00 - 62.4) / 1,000 = 16.59 kips <br />Weight of Backfill (WPG) <br />WPG = VPG * (RPG - 62.4 Ib./cu.ft.) / 1,000 lb/kip <br />Volume of Backfill (VPG) <br />VPG = (A * L) - ((VT/2) + (N * VS) + VGS) <br />Height of backfill useable as down force (surface to midtank) (h) <br />h = HC + (D/2) <br />h = 4.50 + (8.00/ 2) = 8.50 ft. <br />Horizontal projection of backfill due to slope factor (a) (perp. to tank) <br />a=h*SRS <br />a = 8.50 * 0.30 = 2.55 ft. <br />End area of backfill (A) <br />A=(D+a)*h <br />A = (8.00 + 2.55) * 8.50= 90 sq.ft. <br />VPG = (90 * 21) - ((1030/2) +(1 * 43) + 189) = 1090 cu.ft. <br />WPG = (1090 * (120 - 62.4) / 1,000 = 62.81 kips <br />HDF=3+17+63 =82 kips <br />HOLD DOWN FACTOR (HD) - CASE 1 <br />HD = HDF / BF <br />HD= HD=(82/67) =1.23. <br />1.23 > 1.20 Hoid down force is sufficient without additional anchoraae <br />► DOWN FORCE (HDF): CASE 2 - CONCRETE DEADMAN <br />Concrete Deadmen Quantity: 2 ea. (CDQ) <br />Concrete Dea en Height: 1.00 ft. (CDH) <br />Concrete Dead en Length: 20.50 ft. (CDL) <br />Concrete DeadeMen Width: (ea) 1.00 ft. (CDW) <br />HDF = DW/1,000 ib./kip + WGS + WPG + WDM <br />WPG = VPG * (RPG - 61.4 Ib./cu.ft.) <br />VPG =(A*L)- (VT +(N*S�S)+VGS) <br />Height of backfill useable r down load (surface to bottom of tank) (h) <br />Helmick and Lerner Inc`, <br />