4. A new pipe of galvanized iron carries water at 20"C with a velocity of 3 m/s. The pipe should be 200m long and horizontal. If the change in pressure should be no greater than 15kPa over the length, what should the required diameter be? What size pipe should you choose for Schedule 40 and 80 strengths. You will have to follow the iterative approach we started in class. For the range of diameters calculated, the following are nominal diameters, outer diameters, and wall thicknesses. You must check how the inner diameter impacts your pressure change, Reynold's number and velocity. Nominal Outer diameter Wall thickness Wall thickness diameter (mm) (mm) Sch 40 (mm) Sch 80 (mm) 800 813 9.53 12.7 850 864 9.53 12.7