A pipe for conveying water (density = 9.81 kN/m3) to a turbine, called...

A pipe for conveying water (density = 9.81 kN/m³) to a turbine, called penstock, operates at a head of 150 m.The pipe has a 0.8-m diameter and a wall thickness of t. Find the minimum required value of t for a material strength of 120 MPa based on a safety factor of n = 1.8.