8.43 An industrial plant requires a water flow rate of 5.7 m3/min.

The gage pressure in the water main, located in the street 50 m from the plant, is 800 kPa and the gage pressure required in the plant is 500 kPa. The supply line will require installation of 4 elbows in a total length of 65 m. Determine the smallest size of galvanized iron line that should be installed.