对于天然气输送管道，需研制抗氢致裂纹的专用管线钢管；
For the natural gas transmission pipeline, the special steel pipe that can resist hydrogen cracking should be developed.
从而证明了蚁群算法应用于天然气输送管道的优化设计是可行的。
So it is proved the ant colony algorithms are feasible in the optimized design of gas transmission pipelines.
佛两线天然气输送管道检测与评价时，发现管道内焊趾多处开裂。
Cracks were found at internal weld toes of the pipes of Fo-Liang gas transporting line.
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