WQ0039488_Modification Attachments_20181017 (14)

Pump Tank Buoyancy Calculations: Amphidrome Plus Reactors #1 & 2
Diameter of Tank (Inside)8 ft
Wall Thickness 6 in
Height of Tank (top to invert)15.83333 ft
Width of extended base 14 in
Thickness of top 6 in
Thickness of bottom 10 in
Height of top of tank out of ground 0 in
Hatch Area 3.14 sqft
Density of Water 62.4 #/cf
Density of Concrete 150 #/cf
Density Soil 95 #/cf
Effective Weight of 32.6 #/cf
Volume of the inside of the tank 796 cf
Volume of the outside of the tank 295 cf
Volume of the extended base 28 cf
Volume of excavation for tank 1,119 cf
Weight of tank 44,198 #
Weight of water displaced 69,796 #
Weight of Pumps 0 #
Effective Weight of Soil in vertical column 42,996 #
(above ext base + 10 degree wedge)
Total Pumpstation Weight 87,195 #
Sliding Resistnance
R = P*(f)*perimeter = 26,220.48 lbs Slding Resistnace
P = Ka*Usub*(H^2)/2 = 1,473.61 lbs/ft
Ka = 0.33 Ratio of Lateral to vertical earth pressures
Usub = Us*(1-1/SG) = 35.63 #/cf Effective Unit weight of soil
Us = 95.00 #/cf Unit Weitht of Soil
SG =1.60 Specific Gravity of Soil
H = 15.83 ft Depth of Tank (exterior)
f = 0.50 friction factor (0.5 for ext. base, 0.3 for smooth)
Perimeter = pi*d 35.59 ft Perimeter of extended base or tank bottom
d = 11.33 ft diameter of Tank Base
Buoyancy Weight -43,619 #
Negative number means NOT bouyant!
Factor of Safety =1.62
FS (wt only) = 1.25