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UNDEOROUND TANK INSTALLATION <br /> _ Page 2 <br /> Design for Anchorage Against Buoyancy Dmipw Guide <br /> STEP 3 -Determine the Total Net Uplift <br /> Multiply the tank length by the Net Buoyancy to determine the Length <br /> Buoyancy. Subtract the weight of the tank heads from the Length <br /> Buoyancy to determine the Total Net Uplift Tank Length (5) 2QOZ- ft <br /> Net Buoyancy (20) �N o Ibsfft <br /> ft. Tank Length (5) Head Weight (21) 77-s3Z lbs <br /> x '-f(,g0 lbs/ft Net Buoyancy (20) <br /> ® —I 3I.,,ZgZ Ibs TANK BUOYANCY <br /> I 21 Z lbs Tank Buoyancy (22) <br /> 27) lbs Weight of Tank Heads (21) <br /> ® 1:"�,?ql.lbs TOTAL NET UPLIFT <br /> STEP 4-Determine If Design Is Required <br /> If the Total Net Uplift determined in Step 3 is a negative number,then the <br /> tank will not be subject to uplift forces for the specified design conditions, <br /> no anchorage is required, and no further analysis is required. The owner <br /> should verify the design conditions with a qualified geotechnical engineer or <br /> hydrologist. <br /> If the Total Net Uplift determined in Step 3 is a positive number,then the <br /> tank will be subject to uplift forces for the specified design conditions. <br /> These forces must be counteracted by the backfill or, if the backfill by itself <br /> is insufficient, by the backfill and the addition of deadman anchors. <br /> Determine the Design Uplift Force and proceed to Step 5. <br /> f', <br /> —lbs Total Net Uplift (23) <br /> Q x 1.50 minimum Safety Factor <br /> ® 2°E (f Ibs DESIGN UPLIFT FORCE <br /> STEP 5 -Determine the Unit Weight of Backfill and Slab <br /> Separately determine the weight of backfill and slab materials for both the wet and <br /> dry conditions for Zones 1 8,2. This weight will be determined in terms of unit <br /> weight per square foot of plan area. Add all of the individual weights to Dry HT, Zone 1 (13) — R <br /> determine the Unit Weight of Cover. Wet HT, Zone 1 (14) = ? ft <br /> Height Unit WT Dry HT, Zone 2 (15) R <br /> of area of Marl Wet HT, Zone 2 (16) ft <br /> © Unit weight of Dry Slab t31 ft x 150.0 = lbs/sq ft <br /> Unit weight of Wet Slab Q d. ? ft x 87.6 = Ibs/sq ft <br /> ® Unit weight of Dry Backfill ft x 100.0 = — lbs/sq ft <br /> ® Unit weight of Wet Backfill ft x 37.6 = 2-1 `lbs/sq ft <br /> ® UNIT WEIGHT OF COVER = �" lbs/sq ft of plan area <br />