目前,无论低压、中压和高压地下输气管,一般建设的都是金属管,而用沥青保护层和各种其他保护措施(如阴极保护、自动阳极保护及电气排流保护等),来防止土壤对管子的各种腐蚀。沥青绝缘层普通在5—10年就坏掉了,而用其他方法,则如大家所知,并不能毫无例外地保证对所有输气管100%的保护。为了保证长久地保护钢质输气 At present, regardless of low pressure, medium pressure and high pressure underground gas pipelines, metal pipes are generally constructed and are protected by asphalt protective layers and various other protection measures (such as cathodic protection, automatic anode protection and electrical drainage protection) Soil erosion of pipes. Asphalt insulation generally breaks down in 5-10 years, and with other methods, as you know, there is no exception to guarantee 100% protection of all gas pipes. In order to ensure long-term protection of steel gas