The service conditions of the international high-pressure natural gas transmission pipeline, pipeline steel and welded pipe at present are introduced.
介绍了现代国际上高压输送天然气管道，管线钢及焊管的使用情况。
The technical condition of steel used in high-pressure natural gas transmission pipeline and the productive technique and feature of the welded pipe used in the pipeline is discussed.
对国外高压输送天然气管线用钢的技术条件，管线用焊管的生产工艺和生产特点作了论述。
First selection of grade X80 pipeline is suggested on large size high pressure gas transmission pipe in the future.
建议在未来大口径高压输气管线中优先选用X80级管线钢管。
LPG can be replaced by DME as city gas, but pipeline transmission pressure shall not be too high, and gas supply range shall not be too wide.
二甲醚可替代LPG作为城市燃气，但管道输送压力不宜过高，供气范围不宜过大。
LPG can be replaced by DME as city gas, but pipeline transmission pressure shall not be too high, and gas supply range shall not be too wide.
二甲醚可替代LPG作为城市燃气，但管道输送压力不宜过高，供气范围不宜过大。
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