COMPLIANCE INFO_1998-2006 - Laserfiche WebLink

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ALTON ENGINEERING, INC. TRACY TEXACO - TRACY, CA 12/30/97 16:23 TANK HOLDDOWN/BUOYANCY CALCULATION - 20,000 GAL. <TRACY-1.WK1> THIS CALCULATION IS FOR TRUSCO TANKS, AS DESCRIBED BELOW: CAPACITY 20000 GALLONS WEIGHT 18397 LBS. DIAMETER 10.78 FEET SUMPS 1 LENGTH 30.05 FEET TANK SLAB THICKNESS 1.00 FT. BURY DEPTH (TOP OF SLAB) 5.00 FT. ASSUME TANK AND BACKFILL COMPLETELY SUBMERGED, TO BOTTOM OF SLAB: SUB MERGED WGT OF BACKFILL = 60.00 LBS/C.F. (PCF) UNSUBMERGED WGT OF CONCRETE 150.00 PCF WATER = 7.48 GALS./C.F. WATER = 62.40 PCF 1. OVERBURDEN ABOVE THE TANK CAN BE CALCULATED USING THE FOLLOWING FORMULA (PER PBI/RP 100-94): ((H/3)(B1 + B2 + SgRt Bl$B2)) - ((V/2) + M) D = TANK DIAMETER d = BURIAL DEPTH (to BOTTOM of SLAB) = 4.00 FT. H = (D/2) + d = 9.39 FT. L = TANK LENGTH B1 = SLAB AREA = (L+4)$(D+3) _ 469.25 SQ.FT. B2 =REFLECTED TANK AREA (D$L) = 323.98 SQ.FT. V = TANK DISPLACEMENT = Pi$rr$L = 2743.30 C.F. M = VOIDS IN OVERBURDEN = 42' DIAM. SUMPS $ 1 SUMP Pi$(3.5'/2)(3.5'/2) $ 4.00 FT. $ = 38.48 C.F. THEREFORE OVERBURDEN ABOVE TANK WOULD BE EQUAL TO: H/3 B1+B2 SgRtBl;B2 (V/2)+M 3.13 793.23 389.91 1410.13 - 2293.32 C.F. 2293.32 C.F. $ 60.00 PCF = 137599 LBS. 2. CONCRETE SLAB = B1 $ SLAB THICKNESS $ CONC. WGT. = 70388 LBS. 3. TANK WEIGHT (PER MANUFACTURER) = 18397 LBS. 4. TANK TOP ANCILLARY EQUIPMENT = 1500 LBS. TOTAL UPLIFT FORCE (UF) _ (V+M) $ WATER.WGT.= 173583 LBS. TOTAL RESISTANT FORCE (RF) _ (ITEMS 1.-4.) = 227884 LBS. EXCESS RESIST FORCE RF -UF = 54301 LBS. = 27.2 TONS RF MORE THAN UF, THEREFORE, HOLDDOWNS NOT REQUIRED AT 60 ' MIN. BURY DEPTH. SAFETY FACTORY = RF/UF = 1.31 (DOES NOT INCLUDE FRICTION FACTORS, WHICH INCREASE MARGIN). -o0o- SED39ME =- 843 Riske Lane, West Sacramento, CA 95691 (916)372-1888 - Fax 373-1172 Mailing Address: P.O. Box 1025, West Sacramento, CA 95691