What is the thickness of steel plate of an overhead tank?

Question

its diameter is 4.5 meters and a height of 6 meters and it use for water storages.

Answer 1

Use the relation

t = P * D / 2 * f * J

Height is irrelevant to the head thickness of the plate thickness, but the bottom plates will have to consider the pressure head.

Here, t = Thickness of the plate

P = Internal Operating Pressure (Design pressure to be taken 1.1 times the Operating Pressure)

f = Permissible Stress of the Material of Construction (Mild Steel, SS and other common MOCs have between 1000 -1800 kg/cm^2, this value is usually provided by the manufacturers of the plates)

J = Joint Efficiency (1.0 for Class A type, 0.85 for Class B, 0.5 - 0.75 for Class C types)

D = Mean Vessel Diameter

If you are going to use Internal Diameter the relation becomes

t = P * Di / 2 * f * J - P

Here Di = Internal Vessel Diameter

If you are going to use external Diameter

t = P * Do / 2 * f * J + P

Here Do = Outside Diameter of vessel

If you can specify what heads you plan to use I can provide specific relations for spherical, torispherical, elliptical or hemispherical formed heads. The above relation is assuming that you will use a flat head.

Answer 2

go for a 40mm base plate