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UG TANK BUOYANCY/RESTRAINT CALCULATIONS <br />Proj: DSS <br />PN: 21901.00 <br />(1) 20,000 GALLON TANK <br />DESIGN PARAMETERS: <br />VGS = (0.67 * 14.00 * 41.00) - (43 * 0.67 /4.50 * 1) = 376 cu.ft. <br />WGS = 376 * (150.00 - 62.4) / 1,000 = 32.93 kips <br />Weight of Backfill (WPG) <br />WPG = VPG * (RPG - 62.4 Ib./cu.ft.) / 1,000 Ib/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+(10.00/2)=9.50 ft. <br />Horizontal projection of backfill due to slope factor (a) (perp. to tank) <br />a=h*SRS <br />a = 9.50 * 0.25 = 2.38 ft. <br />End area of backfill (A) <br />A=(D+a)*h <br />A = (10.00 + 2.38) * 9.50= 118 sq.ft. <br />VPG = (118 * 37) - ((2906/2) +(1 * 43) + 376) = 2478 cu.ft. <br />WPG = (2478 * (120 - 62.4) / 1,000 = 142.71 kips <br />HDF =8+33+143 =184 kips <br />HOLD DOWN FACTOR (HD) - CASE 1 <br />HD = HDF / BF <br />HD= HD=(184/184) =1.00 <br />HOLD DOWN FORCE (HDF): CASE 2 - CONCRETE DEADMAN <br />Date: 12/22/98 <br />Concrete Deadmen Quantity: 2 ea. (CDQ) <br />Concrete Deadmen Height: 1.00 ft. (CDH) <br />Concrete Deadmen Length: 37.00 ft. (CDL) <br />Concrete Deademen Width: (ea) 1.00 ft. (CDW) <br />HDF = DW/1,000 lb./kip + WGS + WPG + WDM <br />WPG = VPG * (RPG - 62.4 Ib./cu.ft.) <br />VPG = (A * L) - (VT + (N * VS) + VGS) <br />Height of backfill useable for down load (surface to bottom of tank) (h) <br />Helmick and Lerner Inc <br />