Developmental characteristics of gas transmission pipeline abroad

Looking at the current technical development of gas transmission pipeline in foreign countries, mainly has the following characteristics: 1. Increase the pipe diameter. Trunk gas pipelines in foreign countries generally are more than 1000 mm in diameter. The construction technology of large-diameter pipes are more mature. 2. Increasing gas pressure. At present, Western European and North American natural gas pipeline pressure in more than 10 MPA, ayi highest outbound pipeline crossing-point pressure of up to 21 MPA; Norway Statepipe pipeline gas pressure to 13.5 MPa; recently completed North American "Union" pipe maximum allowable operating pressure 12 MPA. 3. Extensive use of drag reduction by internal coating technology, improving transmission capacity. After coating in gas transmission pipeline abroad, can increase the output of gas 6%~10%, can also be effective in reducing number of wear and cleaning of equipment, extend the life of pipeline.