Laserfiche WebLink
APPENDIX A <br /> ABOVEGROUND STORAGE TANK ASSESSMENT CALCULATIONS <br /> TRACY CHEVROLET <br /> 3400 Auto Plaza Way, Tracy California <br /> The gallon (gal) aboveground waste oil tank (AST) has parameters as indicated on Figure 3. <br /> AST WEIGHT <br /> The 480-gallon AST (AST48o) has a weight found by extrapolation utilizing a known tank weight for a <br /> 350-gal AST (AST350). The AST35o has a weight of 730 pounds (lb) when empty and a laden weight of <br /> approximately 3,355 Ib. The weight of 480-gal of waste oil, using a conversion factor of 7.5 Ib per gallon, <br /> is 3,600 Ib. The AST480weight is found to be 1,001 Ib. <br /> HORIZONTAL SHEAR CALCULATION <br /> V = 0.7 x Ca x I x Total AST Empty Weight <br /> where: V = Horizontal Shear <br /> CS = Seismic Coefficient (Table 16-Q, 1997 Uniform Building Code (UBC)) <br /> = Occupancy Importance Factor(Table 16-k, 1997 UBC)) <br /> V = 0.7 x 0.36 x 1.0 x 1,001 pounds force (Ibf) <br /> =252 Ibf <br /> The horizontal shear is calculated at approximately 252 Ibf. <br /> OVERTURN MOMENT CALCULATION <br /> OT = [V x Tank Height(Hp) x 0.5]- [Total AST Empty Weight x Tank Width (WP) x 0.5] <br /> where: OT = Overturn Moment <br /> Hp =Tank Height= 39 in <br /> Wp = Tank Width = 33 in <br /> OT = [252 Ibf x 39 in x(1 ft/12 in) x 0.5]-[1,001 Ib x 33 in x(1 ft/12 in) x 0.5] =406 Ib- 1,376 Ib <br /> _-970 Ibf ft <br /> The tank overturn moment is calculated at approximately-970 Ibf ft. which is less than zero, therefore the <br /> tank will not overturn. <br /> SAFETY FACTOR CALCULATION <br /> SF = [(Total AST Empty Weight x Wp x 0.5)] _[V x Tank Height (Hp) x 0.5] <br /> where: SF= Safety Factor <br /> SF = [( 1001 lb x33 inx(1ft= 12in)x0.5)] =[252lbfx39inx(1ft/12in) x0.5] <br /> = 3.7 <br /> The safety factor was calculated at approximately 3.7 which is greater than 0, therefore the safety factor <br /> is sufficient to not overturn. <br /> Note: <br /> in=inch <br /> ft=foot <br /> Ch2o=7.5 Ib/gal=pounds to gallon conversion factor <br />