昆明城市煤气地下管网在国内城市中首次采用阴极保护技术。本文就工程设计、施工、测试作一介绍,并对如何提高保护率作了些探讨。一、工程概况昆明市煤气一期工程,担负着全市民用5万户及部分工业用户的供气任务。1983年6月开工,1986年8月投产。气源厂在城东20公里处。整个城市管网总长250公里,其中主管(气源厂～城区)Dg630,长18公里; Kunming city gas underground pipe network in the first domestic use of cathodic protection technology. This article on engineering design, construction, testing an introduction, and how to improve the protection rate made some discussion. First, the project profile Kunming Gas Phase I project, responsible for the city’s civilian 50,000 and some industrial users of gas supply tasks. Started in June 1983, put into operation in August 1986. Gas plant in the east 20 kilometers. The entire city pipeline total length of 250 kilometers, of which the director (gas plant ~ City) Dg630, 18 km long;