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MAR -28-02 04:14 PM M 'LE LEE, ARCHITECT <br />19 <br />Mike Lee, Ar�cf;�,lt+ect� <br />Econo Gas - 880 Viotor Rd.. Lodi, CA <br />TANK HOLDDOWNIBUOYANCY CALCULATION -12,000 GAL. <br />916 _72 8512 P.02 <br />3800 Seymour Avenue, West Sacramento, CA 95881 <br />918-372-0313 voice - volcemall 916.372-8512 fax <br />mieealaadps.net email <br />03/28/02 16:07 <br />`mod12-4 Econo.xls' <br />THIS CALCULATION IS FOR MODERN WELDING TANKS, A8 DESCRIBED BELOW; <br />CAPACITY, 12000 GALLONS <br />WEIGHT <br />11176 LBS. <br />DIAMETER 8,08 FEET <br />SUMPS <br />1 <br />LENGTH $2.08 FEET <br />TANK SLAB THICKNESS <br />0.75 FT. <br />SQ.F T- <br />BURY DEPTH (TOP OF SLAB) <br />4.00 FT. <br />SQ.F'T, <br />ASSUME TANK AND BACKFILL COMPLETELY SUBMERGED, TO TOP OF SLAB: <br />SUBMERGED WGT OF BACKFILL = <br />C.F. <br />60.00 LSS/C.F. (PCF) <br />SUBMERGED WGT OF CONC. = <br />1 SUMP(s) <br />87.80 PCF <br />WATER = 7.48 GALSJC.F. <br />C.F. <br />THEREFORE OVERBURDEN ABOVE TANK WOULD BE EQUAL TO: <br />WATER = 62.40 PCF <br />H/3 B1+82 SgRtB1*82 (V/2)+M <br />1. OVERBURDEN ABOVE THE TANK CAN BE CALCULATED USING THE FOLLOWING <br />FORMULA (PER PEIIRP 100-94): <br />((H/3)(B1 + 82 + SgRt 81*132)) - ((V/2) + M) <br />D - TANK DIAMETER <br />d = BURIAL DEPTH (to BOTTOM of SLAG) ■ <br />3.25 <br />FT. <br />H ® (D/2) + d - 7.29 FT. <br />L = TANK LENGTH <br />B1- SLAB AREA - (L+4)*(D+3) - <br />399.92 <br />SQ.F T- <br />62 - REFLECTED TANK AREA (D*L) ■ <br />259.34 <br />SQ.F'T, <br />V: TANK DISPLACEMENT - Pi*f *L ® <br />1646.46 <br />C.F. <br />M = VOIDS IN OVERBURDEN ■ 43"D. SUMPS' <br />1 SUMP(s) <br />= PI`(3,58'/2)(3.58'12)' 3.25 FT. * 6 - <br />32.71 <br />C.F. <br />THEREFORE OVERBURDEN ABOVE TANK WOULD BE EQUAL TO: <br />H/3 B1+82 SgRtB1*82 (V/2)+M <br />2.43 659.26 322.05 888.94 <br />1529,20 C.F. <br />1529.20 C.F.' 60.00 PCF = <br />91752 <br />LBS. <br />2. CONCRETE SLAB - 181 * SLAB THICKNESS * CONC. WGT. - 26275 LBS, <br />3. TANK WEIGHT (PER MANUFACTURER) * 11175 LBS. <br />4. TANK TOP ANCILLARY EQUIPMENT- 1250 LBS. <br />TOTAL UPLIFT FORCE (UP) - (V+M) * WATER.WGT.m 104780 LBS, <br />TOTAL RESISTANT FORCE (RF) - (ITEMS 1.4.) = 130452 LBS. <br />EXCESS RESIST FORCE RF -UF = 25871 LBS. _ 12.8 TONS <br />RF:P, UF, THEREFORE, HOLDDOWNS NOT REQUIRED AT 48 " MIN. BURY DEPTH. <br />SAFETY FACTORY- RFIUF = 1.25 (DOES NOT INCLUDE FRICTION FACTORS, <br />WHICH INCREASE MARGIN). <br />