A flow of 125 gpm of chilled water at 45 F is to be transported from a chiller to a set of cooling coils located 120 feet away. Assume a design pressure loss of 0.017 psia per ft and a surface roughness of 0.0005 ft. Calculate the required pipe diameter.

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?