Abstract
Cleaning and relining of water transmission lines is economical if the costs are less than the savings in energy and pumping capacity which occur because of the increased carrying capacity of the pipe. Criteria are developed to determine if it is economical to clean and reline a pipe for two cases: (1) Flow not significantly changed by rehabilitation of pipe; or (2) system is looped so that change in carrying capacity significantly changes flow. The decision depends on the cost to clean and reline the pipe, the price of energy, the incremental cost of pumping capacity, the peak and average flow in the pipe, the nominal diameter, the interest rate, the year in which the pumping eguipment will be upgraded or replaced, and the Hazen-Williams C factor before and after rehabilitation. A sensitivity analysis of several of the variables is presented.
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