In order to find proper location of fault holiday and other defects in anticorrosion coating of undergrounder pipe laying direction and depth of the pipe SL-II type of leak detector for under - grounder pipe is used .

为了 检查 地下 金属管道防腐层损伤、 漏 包等缺陷的准确位置，地下管道走向及 估测管道埋土深度，使用了SL-Ⅱ型地下管道防腐层检漏仪。