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For a round tank you must find the volume of the tank - V (cubic ft) = pi x radius squared x the depth or height of the tank. The radius and the depth are in feet.
Next take the volume x 7.47 = Gallons of water in the tank
The weight of the tank is the weight of the water x 8.4
example: A water tank that is 2 ft. in diameter and has a height of 5 ft.
The radius is 1/2 of the diameter.
V = 3.1416 x 1 x 5 = 15.708
15.708 x 7.47 = 117.34
117.34 x 8.4 = 986# approx.
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