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一、绪言 经净化和加压之后的各类煤气,通过各级管网输配,供给城市民用及工业用户。输配管网的投资通常约占整个工程的总投资的30～45％,其金属耗用量达60～70％以上,它是工程建设中的重要组成部分,其设计合理与否,直接关系到管网运行、管理及使用的经济、安全和可靠性。管网的设计、尤其大型网络的计算是一个繁锁复杂的过程,利用正在发展起来的电子计算机技术则可大大
I. INTRODUCTION After purification and pressurization, various types of gas are distributed through the pipeline networks at various levels to supply urban civil and industrial users. The investment in transmission and distribution network usually accounts for 30-45% of the total investment of the entire project, and its metal consumption is over 60-70%. It is an important part of the project construction, and its design is directly related to whether the design is reasonable or not. The economics, safety and reliability of running, managing and using the pipe network. The design of the pipe network, especially the calculation of large-scale networks, is a complex and complicated process. The use of developing electronic computer technologies can greatly