4.9. A vertical axis circular cylindrical water storage tank of cross-sectional area A is filled to a depth of 15 m. The tank is 4 m in radius and is made of steel having a yield point of 240 MPa. If a safety factor of 2 is applied, determine the required tank wall thickness. The pressure in the water is yy where y is measured from the free surface. Use water 9800 N/m. Ans. h 4.9 mm nioq bloiy odi qu 4.10. Avertical cylindrical gasoline storage tank is 30 m in diameter and is filled to a depth of 15 m with gasoline rific weight is 7260 N/m³ If the yield point of the shell plating is 250 MPa and a safety factor of 25