COMPLIANCE INFO_2020 - Laserfiche WebLink

Home Browse Search

Seismic Calculations-Waste Oil Tank Latitude Longitude 38.000012 -121.290497 Seismic acceleration S's 0.995 Value checked 9/14/17 Checking to see if tank is adequately secured for motion laterally Shear(earthquake lateral force) For all directions in schematic drawing: Tank height(w/o supports) 60 in Tank width 44 in Tank length 44 in Tank capacity 200 gal Weight tank contents full 1501 lbs sp gr motor oil=0.9 Weight tank empty 1500 lbs from schematic drawing Weight Waste Oil Tank and contents 3001 lbs This is W Size of bolts anchoring tank 3/4" Bolt strength per bolt shear,3/4"bolt 12890 lbs See note below for bolt strength reference Number of bolts 4 Bolt strength,four bolts 51560 lbs Max V(earthquake force) 0.199 W Max V(earthquake force) 597 lbs Factor of safety 86 ok Overturning-directions right and left in schematic drawing: Moment arm,earthquake 34 in tank supports are 4"high-see manufacturer's drawing Overturning moment at Max V* 1692 Ib ft overturning moment caused by earthquake Seismic Calculations-Waste Oil Tank,continued Resisting moment of tank** 3037 Ib ft due to weight of tank and contents,supports are 8"from sides Pullout strength,3/4"bolt 8110 lbs See note below for bolt strength reference Combined strength,two 3/4"bolts 16220 lbs Moment arm,bolts 28 in bolts are 28"apart Resisting moment of bolts 37847 Ib ft Combined resisting moments 40883 Ib ft of tank and bolts Factor of safety 24 ok In directions up and down in schematic drawing,moment arm of bolts is longer. Therefore factor of safety is higher. In direction up in schematic drawing,tank is also against a wall. Bolt strengths from Hilti 2014 American Product Tech Guide-Kwik Bolt TZ Stainless Steel for 2500 psi cracked concrete. Bolts into concrete have also been sealed with chemical adhesive. *this calculation overstates the overturning moment because the liquid containing compartment of this tank is only in lower portion. manufacturer's drawing. Therefore,it is conservative. "for this calculation assume that vertical component of earthquake=2/3 Max V.