The general equation for estimating annual pumping costs

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Reference no: EM131863504

"All industrial facilities have a network of piping that carries water or other liquids. According to a U.S. Department of Energy study, 16% of a typical facility's electricity costs are for its pumping systems. Suppose that you are considering a pumping facility having 14,000 ft to carry 610 gpm of water continuously to storage tank. The general equation for estimating annual pumping costs is

Cost($)= [(Friction factor)(Pipe length in ft)(Number of hours)($/kWh)(Flow in gpm)^3]/[1705*(Combined pump and motor efficiency)(Pipe inner diameter in inches)^5]

Where the friction factor is 0.0176. The electricity cost is $0.05/kWh, the pumping system operates for 8,670 hours annually, and the combined pump and motor efficiency is 0.7. The price for 14,000 feet of steel pipe is $10,500 per inch of the inner diameter. Determine the optimal size of the pipe's inner diameter in inches by minimizing the annual equivalent cost. Assume that the pumping operation will last 14 years, the salvage value of the pipe is 9% of the initial investment, and a discount rate of 10%."

Reference no: EM131863504

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