This paper analyzes the performance that the polyethylene lining resists the internal pressure of the pipeline at spanned gaps, during its insertion inside the old gas pipe.
分析了聚乙烯内衬管从旧燃气管道内穿插跨越管道缝隙处，聚乙烯内衬承受管道内压的性能。
The present invention relates to the method of eliminating internal rust stains and scales of and coating wall protecting paint to water pipe, gas pipe and oil pipe.
高压气、水管道除垢及护壁方法，涉及对供水管、给水管、煤气管、输油管清除管内的锈斑和结垢和涂覆护壁涂料的方法。
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