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1.管道检测技术 随着煤气事业的发展,近十年来,输气管道向大口径、高强度、高压力发展。由于高强度管材的出现,所以又出现薄壁钢管。这就要求对新投入前和运行多年的地下钢管有可能出现的任何缺陷及早发现。美国非常重视地下钢管的定期和巡回检查。定期检查的目的主要是清除线路上生长的植物,防止人为的破坏,经常保持明显的线路标志,检查阀门开启情况及填料和垫圈的严密性,检查阴极保护设施等。
1. Pipeline inspection technology With the development of the gas industry, gas pipelines have developed to large diameters, high strengths, and high pressures in the past decade. Due to the appearance of high-strength pipes, thin-walled steel pipes have emerged. This requires early detection of any defects that may occur in underground steel pipes before and during the new years of operation. The United States attaches great importance to the regular and touring inspection of underground steel pipes. The purpose of regular inspections is to remove the plants growing on the line, prevent man-made damage, often maintain clear line signs, check valve opening conditions and the tightness of packings and gaskets, and check cathodic protection facilities.