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L OVERBURDEN ABOVE THE TANK CAN BE CALCULATED USING THE FOLLOWING <br />FORMULA (PER PBI/RP 100-94): <br />((H/3)(BI + B2 + SgRt B142)) - ((V/2) + M) <br />D : TANK DIAMETER <br />d = BURIAL DEPTH (to BOTTOM of SLAB) : 4,00 FT. <br />H ° (D/2) + d = 9.39 FT. <br />L = TANK LENGTH <br />B1 = SLAB AREA = (L+4)'(D+3) 469.25 SQ.FT. <br />B2 = REFLECTED TANK AREA (D$L) = 323.98 SQ.FT, <br />V = TANK DISPLACEMENT : Pi*rr=L = 2743.30 C.F. <br />M = VOIDS IN OVERBURDEN = 42' DIAM. SUMPS # 2 SUMP <br />: P1t(3.5'/2)(3.5'/2) : 4.00 FT.: = 76.97 C.F. <br />THEREFORE OVERBURDEN ABOVE TANK WOULD BE EQUAL TO: <br />H/3 B1+82 S9RtB1*B2 (V/2)+M <br />3.13 793.23 389.91 1448.62 - 2254.84 C.F. <br />2254.84 C.F.: 60.00 PCF = 135290 LBS. <br />2. CONCRETE SLAB : B1 : SLAB THICKNESS : CONC. WGT, = 70388 LBS. <br />3. TANK WEIGHT (PER MANUFACTURER) = 18397 LBS. <br />4. TANK TOP ANCILLARY EQUIPMENT : 1500 LBS. <br />TOTAL UPLIFT FORCE (UF) _ (V+M) x WATER.WGT.: 175985 LBS. <br />TOTAL RESISTANT FORCE (RF) : (ITEMS L-4.) : 225575 LBS. <br />EXCESS RESIST FORCE RF -UF : 49591 LBS. = 24.8 TONS <br />RF MORE THAN UF, THEREFORE, HOLDDOWNS NOT REQUIRED AT 60 ' MIN. BURY DEPTH. <br />SAFETY FACTORY : RF/UF = 1.28 (DOES NOT INCLUDE FRICTION FACTORS, <br />WHICH INCREASE MARGIN). <br />-o0o- <br />• <br />843 Riske Lane, West Sacramento, CA 95691 (916) 372-1888 - Fax 373-1172 <br />Mailing Address: P.O. Box 1025, West Sacramento, CA 95691 <br />WALTON <br />ENGINEERING9 INC. <br />TRACY TEXACO - TRACY, CA <br />12/30/97 16:22 <br />TANK HOLDDOWN/BUOYANCY CALCULATION - <br />20,000 GAL. (TRACY-2.WK1> <br />THIS CALCULATION IS FOR TRUSCO TANKS, <br />AS DESCRIBED BELOW: <br />CAPACITY 20000 GALLONS <br />WEIGHT 18397 LBS. <br />DIAMETER 10.78 FEET <br />SUMPS 2 <br />LENGTH 30.05 FEET <br />TANK SLAB THICKNESS <br />1.00 FT, <br />BURY DEPTH (TOP OF SLAB) <br />5.00 FT. <br />ASSUME TANK AND BACKFILL COMPLETELY SUBMERGED, TO BOTTOM OF SLAB: <br />SUBMERGED WGT OF BACKFILL = <br />60.00 LBS/C.F. (PCF) <br />UNSUBMERGED WGT OF CONCRETE <br />150.00 PCF <br />WATER : 7.48 GALS./C.F. <br />WATER : 62.40 PCF <br />L OVERBURDEN ABOVE THE TANK CAN BE CALCULATED USING THE FOLLOWING <br />FORMULA (PER PBI/RP 100-94): <br />((H/3)(BI + B2 + SgRt B142)) - ((V/2) + M) <br />D : TANK DIAMETER <br />d = BURIAL DEPTH (to BOTTOM of SLAB) : 4,00 FT. <br />H ° (D/2) + d = 9.39 FT. <br />L = TANK LENGTH <br />B1 = SLAB AREA = (L+4)'(D+3) 469.25 SQ.FT. <br />B2 = REFLECTED TANK AREA (D$L) = 323.98 SQ.FT, <br />V = TANK DISPLACEMENT : Pi*rr=L = 2743.30 C.F. <br />M = VOIDS IN OVERBURDEN = 42' DIAM. SUMPS # 2 SUMP <br />: P1t(3.5'/2)(3.5'/2) : 4.00 FT.: = 76.97 C.F. <br />THEREFORE OVERBURDEN ABOVE TANK WOULD BE EQUAL TO: <br />H/3 B1+82 S9RtB1*B2 (V/2)+M <br />3.13 793.23 389.91 1448.62 - 2254.84 C.F. <br />2254.84 C.F.: 60.00 PCF = 135290 LBS. <br />2. CONCRETE SLAB : B1 : SLAB THICKNESS : CONC. WGT, = 70388 LBS. <br />3. TANK WEIGHT (PER MANUFACTURER) = 18397 LBS. <br />4. TANK TOP ANCILLARY EQUIPMENT : 1500 LBS. <br />TOTAL UPLIFT FORCE (UF) _ (V+M) x WATER.WGT.: 175985 LBS. <br />TOTAL RESISTANT FORCE (RF) : (ITEMS L-4.) : 225575 LBS. <br />EXCESS RESIST FORCE RF -UF : 49591 LBS. = 24.8 TONS <br />RF MORE THAN UF, THEREFORE, HOLDDOWNS NOT REQUIRED AT 60 ' MIN. BURY DEPTH. <br />SAFETY FACTORY : RF/UF = 1.28 (DOES NOT INCLUDE FRICTION FACTORS, <br />WHICH INCREASE MARGIN). <br />-o0o- <br />• <br />843 Riske Lane, West Sacramento, CA 95691 (916) 372-1888 - Fax 373-1172 <br />Mailing Address: P.O. Box 1025, West Sacramento, CA 95691 <br />