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UG TANK BUOYANCYIRESTRAINT CALCULATIONS <br />Proj: DSS <br />PN: 21901.00 <br />(1) 20.000 GALLON TANK <br />DESIGN PARAMETERS: <br />Tank Size: <br />20,000 <br />gal. <br />(TS) <br />Tank Length: <br />37.00 <br />ft. <br />(L) <br />Tank Diameter: <br />10.00 <br />ft. <br />(D) <br />Tank Dry Weight: <br />8,210 <br />lb. <br />(DW) <br />Depth of Cover (Bury): <br />4.50 <br />ft. <br />(HC) <br />Quantity of Sumps: <br />1 <br />ea. <br />(N) <br />Diameter of Largest Sump: <br />3.50 <br />ft. <br />(DS) <br />Density of Backfill: <br />120 <br />Ib./cu.ft. <br />(RPG) <br />Density of Concrete: <br />150 <br />lb./cu.ft. <br />(RC) <br />Soil Rupture Surface (h/v): <br />0.25 <br />(SRS) <br />Grade Slab Height: <br />0.67 <br />ft. <br />(GSH) <br />Grade Slab Length: <br />41.00 <br />ft. <br />(GSL) <br />Grade Slab Width: <br />14.00 <br />ft. <br />(GSW) <br />Minimum Hold Down Factor: <br />1.20 <br />(HD) <br />Assumptions: <br />Water surface at top of grade slab. <br />ADJACENT TANK SPACING 3'-0" <br />BUOYANCY FORCE (BF) <br />BF = (VT + (N * VS)) * 0.0624 kips/cu.ft. <br />Volume of Tank (VT) <br />VT = L * D^2 * pi/4 <br />VT = 37.00 * 10.00^2 * pi/4 = 2906 cu.ft. <br />Volume of Sumps (VS) <br />VS = HC * DSA 2 * pi/4 <br />VS = 4.50 * 3.50^2 * pi/4 = 43 cu.ft. <br />BF = (2906 +(1 * 43)) * 0.0624 kips/cu.ft. = 184 kips <br />HOLD DOWN FORCE (HDF): CASE 1 - NO ANCHOR <br />HDF = DW / 1,000 Ib/kip + WGS + WPG <br />Weight of Grade Slab (WGS) <br />WGS = VGS * (RC -62.4 Ib/cu.ft.) / 1000 Ib./kip <br />Volume of Grade Slab (VGS) <br />VGS = (GSH * GSW * GSL) - (VS * GSH/HC * N) <br />Helmick and Lerner Inc <br />Date: 12/22/98 <br />