As the most common flaws in industrial piping systems, weld flaws frequently lead to accidents. Therefore, assessment of piping with weld flaws is of great significance.

焊接缺陷是工业管道系统中最常见的缺陷，而管道系统中由于焊接缺陷引起的事故屡屡发生，因此管道焊接缺陷评定对于管道的安全运行具有重要意义。

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The pressure impact will produce influence on the steadiness of hydraulic system, and lead to the damage of seal apparatus, piping, and components in the system;

压力冲击会影响液压机构工作稳定性，引起系统中的密封装置、 管路、元件的损坏；

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The thefts are usually of lead from roofs, flashing and copper piping, and lightning conductors.

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