Given: Diameter, d = 200 cm = 2 m, Pressure head, h = 10,000 cm = 100 m, Tickness t = 0.75 cm = 0.0075 m Both longitudinal and hoop stress are tensile in nature, But as per design consideration of thickness we use hoop stress for calculation. Pressure inside the cylinder, P=ρgh=1000×10×100=106 Pa σh=