Chilled water for a chemical plant is pumped from a river located 2,500 ft from the plant site. A preliminary design indicates that a 6-in. steel pipe is to be used for a flow of 600 gal/min. Calculate the pressure drop and the annual cost of pumping if energy costs 3 cents per kWh. Could you reduce your energy cost by using 8-in. or 10 in., and will it be enough to offset the increase in the cost of the pipe? Use $15/ft of length for the installation cost of the 6-in. pipe, and $20/ft for the 8-in., and $25/ft for the 10-in. Annual maintenance costs represent 5% of installation costs.