As shown, air (20°C) is fl owing from a large tank, through a horizontal pipe, and then discharging to ambient. Th e pipe length is L = 50 m, and the pipe is schedule 40 PVC with a nominal diameter of...

As shown, air (20°C) is fl owing from a large tank, through a horizontal pipe, and then discharging to ambient. Th e pipe length is L = 50 m, and the pipe is schedule 40 PVC with a nominal diameter of 1 inch. Th e mean velocity in the pipe is 10 m/s, and f = 0.015. Determine the pressure (in Pa) that needs to be maintained in the tank.