经济管径与工程投资浅析

分析了管道动力消耗与管径之间的函数关系及数学表达式，通过管道直径与管道单价的对应关系，阐述了管径与工程一次投资费用的关系。结果表明，管道直径与工程一次投资成正比而与动力消耗成反比，其间存在选取最佳管径，即经济管径的问题。最低综合费用=一次投资费用 操作费用。

Brief Discussion on Economic Pipe Diameter and Invest of Project

Author analyzed the function relation and mathematic expression between the power consumption of pipeline and pipe diameter, through the corresponding relation between the pipeline diameter and unit price of pipeline, the relation of pipe diameter and the primary invest cost of project was described, the result shows that the pipeline diameter is directly proportional to primary invest of project and contra proportional to power consumption, in which exists selecting optimum pipe diameter, that is, existing the problem of economic pipe diameter. The lowest comprehensive cost equals to primary invest cost plus operation cost.