Considering the timevalue of the funds is ignored in the traditional calculation of economic diameter for pulp conveying pipe and the process to get the local pressure head loss through the chart by estimating the diameter brings inconvenience and deviation, the capital timevalue is taken into consideration and the process to get the equivalent length of piping accessories is simplified in this paper, furthermore, the formula for economic diameter is obtained and an example is provided at the same time. The results showed that the economic diameter with considering the capital timevalue is about 103 %-126 % smaller than that with traditional method when pulp consistency ranges from 1 % to 35 %, accompanied by the pipeline construction costs drop 165 %-201 % and the overall economic efficiency saves 2631-2907 yuan per meter, so that the project construction costs and later pipeline renewal expenses are effectively reduced.
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