示踪线安装于PE管道中要注意的问题

Problems needing attention in the installation of tracing line in PE pipeline

在PE管道的运行和交接中，检查示踪线的合规性有5项：

During the operation and handover of PE pipes, there are 5 items to check the compliance of tracing lines:

①检查信号接入点是否存在和安装是否正确。

① Check whether the signal access point exists and is installed correctly.

②可在示踪线上加载检测信号，中间故障太多，漏电严重，中间没有检测井。

② The detection signal can be loaded on the tracer line. There are too many intermediate faults and serious leakage. There is no detection well in the middle.

③示踪线安装，首尾截断悬空，不与地面接触，中间阀井示踪线不固定。

③ The tracer line shall be installed with the head and tail cut off and suspended in the air, not in contact with the ground, and the tracer line of the middle valve well shall not be fixed.

④示踪线直径太小，不能满足检测信号传输的要求，容易被施工割断或受自然应力损坏。

④ The diameter of the tracing line is too small to meet the requirements of detection signal transmission, and it is easy to be cut off by construction or damaged by natural stress.

⑤PE管表面标志按安装记忆印象埋设，密度不足，偏差大。

⑤ PE pipe surface signs are buried according to the installation memory impression, with insufficient density and large deviation.

不能保证检测信号的连续平滑。主要原因有五个：

The continuity and smoothness of the detection signal cannot be guaranteed. There are five main reasons:

①示踪剂中的导线未接好，导致断路。

① The lead in the tracer is not connected properly, resulting in an open circuit.

②示踪线没有绝缘防水，导致信号短路。

② The tracer wire is not insulated and waterproof, resulting in signal short circuit.

③金属线的导电面积不够，导致信号传输电阻大，信号衰减大。

③ The conductive area of the metal wire is not enough, resulting in large signal transmission resistance and large signal attenuation.

④示踪线本身不合格，断丝不连续。

④ The tracer line itself is unqualified and the broken wire is discontinuous.

⑤示踪线头端未连接、固定、接地，剪断或埋入，找不到头。

⑤ The head end of the tracer wire is not connected, fixed, grounded, cut or buried, and the head cannot be found.

没有暴露的探头信号源。

No exposed probe signal source.

PE管道示踪线无信号触点设计或未按触点设计安装。很多单位在示踪线安装时直接将示踪线接头埋在地表下或将示踪线接头直接包裹在管道或设备上。在短的时间内，将无法找到示踪关节，导致整个示踪剂变得无用。

The PE pipe tracing line is designed without signal contact or is not installed according to the contact design. Many units directly bury the tracer line connector under the ground or directly wrap the tracer line connector on the pipeline or equipment when installing the tracer line. In a short time, the tracer joint will not be found, resulting in the whole tracer becoming useless.

面积太小，强度不够。

The area is too small and the strength is not enough.

金属丝截面积的选择不正确。在选择示踪线之前，有必要确定使用哪个检测器。不同的探测器有不同的探测原理和方法，需要选择有针对性的示踪线。金属丝截面积的选择需要根据探测器信号发生器的信号强度和设计管道所需的探测距离来选择金属丝的种类和截面积电线。一般情况下，2.5mm2铜芯线的一次检测距离可达500~1000m。直接法会更远，施工时很少出现拉断现象。

Incorrect selection of wire cross-sectional area. Before selecting a trace line, it is necessary to determine which detector to use. Different detectors have different detection principles and methods, so it is necessary to select a targeted tracer line. The type and cross-sectional area of wire shall be selected according to the signal strength of detector signal generator and the detection distance required for pipeline design. Generally, the one-time detection distance of 2.5mm2 copper core wire can reach 500~1000m. The direct method will be further away, and there will be little tension and fracture during construction.

用警告胶带更换管道示踪线。示踪线由警示胶带代替，未按标准要求铺设。

Replace the pipe trace line with warning tape. The tracing line was replaced by warning tape and was not laid according to the standard requirements.

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