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9* 0 <br />WALTON <br />ENGINEERING, INC. <br />QUIK STOP 121 - 1196 W. LOUISE, MANTECA, CA 95336 03/11/98 09:37 <br />TANK HOLDDOWN/BUOYANCY CALCULATION - 12,000 GAL, <XERX-12K.WKI> <br />THIS CALCULATION IS FOR XERXES TANKS, AS DESCRIBED BELOW: <br />CAPACITY 11527 GALLONS WEIGHT 4650 LBS. <br />DIAMETER 8.00 FEET SUMPS 2 <br />LENGTH 37.04 FEET <br />TANK SLAB THICKNESS 0.67 FT, <br />BURY DEPTH (TOP OF SLAB) 4.00 FT. <br />ASSUME TANK AND BACKFILL COMPLETELY SUBMERGED, TO BOTTOM OF SLAB: <br />SUBMERGED WGT OF BACKFILL = 60.00 LBS/C.F. (PCF) <br />UNSUBMERGED WGT OF CONC. = 150.00 PCF <br />WATER = 7.48 GALS./C.F, <br />WATER : 62.40 PCF <br />1, OVERBURDEN ABOVE THE TANK CAN BE CALCULATED USING THE FOLLOWING <br />FORMULA (PER PEI/RP 100-94): <br />((H/3)(B1 + B2 + SgRt 111*112)) - ((V/2) + M) <br />D = TANK DIAMETER <br />d = BURIAL DEPTH (to BOTTOM of SLAB) : 3.33 FT, <br />H = (D/2) + d = 7,33 FT. <br />L = TANK LENGTH <br />B1 = SLAB AREA = (L+4)*(D+3) = 451.44 SQ.FT. <br />B2 = REFLECTED TANK AREA (D#(L-D)+(D/2*D/2$Pi) = 282,59 SQ.FT, <br />V = TANK DSPLMNT. = Pi((rr*L-2r)+(4/3*rrr)) = 1727.79 C.F. <br />M = VOIDS IN OVERBURDEN : 48" DIAM. SUMPS s 2 SUMP <br />= Pi#(4.0'/2)(4.0'/2) # 3.33 FT. * # = 83.78 C.F. <br />THEREFORE OVERBURDEN ABOVE TANK WOULD BE EQUAL TO: <br />H/3 B1+B2 SgRtBl*B2 (V/2)+M <br />2.44 734.03 357.17 947.67 - 1719.69 C.F. <br />1719.69 C.F. * 60.00 PCF = 103182 LBS. <br />2. CONCRETE SLAB = B1 x SLAB THICKNESS * CONC. WGT. = 45144 LBS <br />3. TANK WEIGHT (PER MANUFACTURER) : 4650 LBS. <br />4. TANK TOP ANCILLARY EQUIPMENT = 1250 LBS. <br />TOTAL UPLIFT FORCE (UF) _ (V+M) : WATER.WGT.= 113042 LBS. <br />TOTAL RESISTANT FORCE (RF) _ (ITEMS 1.-4.) = 154226 LBS. <br />EXCESS RESIST FORCE RF -UF : 41184 LBS.: 20.6 TONS <br />RF MORE THAN UF, THEREFORE, HOLDDOWNS NOT REQUIRED AT 48 " MIN, BURY DEPTH. <br />SAFETY FACTORY = RF/UF = 1.36 (DOES NOT INCLUDE FRICTION FACTORS, <br />NOR REDUCTION FOR WET INTERSTITIAL SPACE, WHICH INCREASE MARGIN). <br />-000- <br />t I (VIA/- R g <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 />