A water fountain is to be installed at a remote location by attaching a cast iron pipe directly to a water main through which water is flowing at 70 deg F and 60 psig The entrance to the pipe is sharp edged, and the 70 ft long piping system involves three 90 deg miter bends without vanes, a fully o...

A water fountain is to be installed at a remote location by attaching a cast iron pipe

Question:

A water fountain is to be installed at a remote location by attaching a cast iron pipe directly to a water main through which water is flowing at 70°F and 60 psig. The entrance to the pipe is sharp-edged, and the 70-ft-long piping system involves three 90° miter bends without vanes, a fully open gate valve, and an angle valve with a loss coefficient of 5 when fully open. If the system is to provide water at a rate of 15 gal/min and the elevation difference between the pipe and the fountain is negligible, determine the minimum diameter of the piping system.

15 gpm 70 ft Water 60 psig main