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WALTON <br /> ENGINEERING, INC. <br /> - QUIK STOP 125 - 1580 W. Main, Ripon, CA 95366 08/20/98 13:41 <br /> TANK HOLDDOWN/BUOYANCY CALCULATION - 8,000 GAL. <XQ125-8.WKI> <br /> THIS CALCULATION IS FOR XERXES TANKS, AS DESCRIBED BELOW: <br /> CAPACITY 7841 GALLONS WEIGHT 3460 LBS, <br /> DIAMETER 8.00 FEET SUMPS 2 <br /> LENGTH 26.04 FEET <br /> TANK SLAB THICKNESS (8") 0.67 FT. <br /> ASSUME BURY DEPTH (T,O,S.) 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)(BI + B2 + SgRt BI$B2)) - ((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) = 330,44 SQJT, <br /> B2 = REFLECTED TANK AREA (D;(L-D)+(D/2*D/2#Pi) = 194.59 SQ.FT. <br /> V = TANK DSPLMNT, = Pi((rr*L-2r)+(4/3*rrr)) = 1174.87 C.F. <br /> M = VOIDS IN OVERBURDEN = 48" DIAN. SUMPS * 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 /> 11/3 B1+B2 SgRtBI#B2 (V/2)+M <br /> 2.44 525.03 253.57 671.21 = 1232.03 C.F. <br /> 1232.03 C.F. * 60.00 PCF = 73922 LBS, <br /> 2. CONCRETE SLAB = B1 * SLAB THICKNESS # CONC. WGT. = 33044 LBS. <br /> 3. TANK WEIGHT (PER MANUFACTURER) = 3460 LBS, <br /> 4. TANK TOP ANCILLARY EQUIPMENT = 1250 LBS. <br /> TOTAL UPLIFT FORCE (UF) _ (V+M) WATER.WGT,= 78540 LBS. <br /> TOTAL RESISTANT FORCE (RF) _ (ITEMS L-4.) = 111676 LBS. $5�n AR <br /> EXCESS RESIST FORCE RF-UF = 33136 LBS. = 16,6 TONSG <br /> RF MORE THAN UF, THEREFORE, HOLDDOWNS NOT REQUIRED AT 48 " MIN. BURY DEPTH. cls <br /> SAFETY FACTORY = RF/UF = 1.42 (DOES NOT INCLUDE FRICTION FACTORS, 9 REN.3-31-99 <br /> O <br /> WHICH INCREASE MARGIN). CAZ'� <br /> - <br /> oQo - ��AIr'1 D <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 />