本程序是用来编程求输气管道管径的，它根据已有的计算公式和管输设计参数，可以求得规定流量和压力下的经济管径，为管道设计更加可靠、经济。-This procedure is used to program requirements diameter pipeline, which under the existing formula and pipeline design parameters, pressure and flow can be obtained under the provisions of the economic diameter of pipeline design more reliable and economical.