由于PE管不导电，不带磁性，无法对PE管进行跟踪，给以后的管道维护带来不便。气体示踪线有效了非金属管道不能用金属管道探测器探测的问题。那么铺设示踪线有哪些注意事项呢？

Because the PE pipe is non-conductive and non-magnetic, it is impossible to track the PE pipe, which brings inconvenience to the future pipeline maintenance. The gas tracing line effectively solves the problem that non-metallic pipelines cannot be detected by metal pipeline detectors. So what are the precautions for laying the trace line?

1、走线埋设时，应紧靠PE管成一条直线，好位于管顶面。不要以螺旋状埋在PE管上，容易导致检测结果不准确。

1. When laying, it shall be in a straight line close to the PE pipe and be located on the top surface of the pipe. Do not bury the PE pipe in spiral shape, which may lead to inaccurate test results.

2、人孔处或地外的示踪线应预留一定长度的导线（1m以上为宜），用于信号的检测和应用。这可以提高检测效率和准确性。

2. A certain length of conductor (more than 1m) shall be reserved for the tracer line at the manhole or outside the ground for signal detection and application. This can improve the detection efficiency and accuracy.

3、示踪线接头或分支点必须连接牢固，保持良好的导电性，并用绝缘胶带包裹，以防地下潮湿造成腐蚀和断线，中断检测信号。管道钢塑转换接头处的示踪线可焊接在法兰上，接头处应进行防腐处理，以防长时间腐蚀而断开。

3. The tracer line joint or branch point must be firmly connected to maintain good conductivity and wrapped with insulating tape to prevent corrosion and disconnection caused by underground moisture and interrupt the detection signal. The tracer line at the steel plastic conversion joint of the pipeline can be welded on the flange, and the joint shall be subject to anti-corrosion treatment to prevent disconnection due to long-term corrosion.

4、为了增加示踪线的信号强度，使信号分布均匀，施工时必须尽量减小示踪线埋地端的接地电阻，并做好剥去外皮的接地措施。外露芯线的绝缘层应取30cm。尤其是长度较短的支管末端，一定要做好接地，否则支管上的信号会很微弱，检测不到。

4. In order to increase the signal strength of the tracer line and make the signal distribution uniform, the grounding resistance at the buried end of the tracer line must be reduced as much as possible during construction, and the grounding measures of peeling off the skin shall be taken. The insulation layer of exposed core wire shall be 30cm. In particular, the end of the branch pipe with short length must be well grounded, otherwise the signal on the branch pipe will be very weak and can not be detected.

5、如果管道埋设长度超过1km，且中间没有人孔等设施预留示踪头以满足检测需要，建议每设置一个试验桩，预留示踪剂联合检测。

5. If the buried length of the pipeline exceeds 1km, and there is no manhole and other facilities to reserve a tracer head to meet the detection needs, it is recommended to set a test pile every kilometer and reserve a tracer for joint detection.

6、非开挖工程施工中，PE管道外的示踪线在拖管过程中容易被扯断。简单的方法是选择截面积更大、强度更高的钢丝或钢丝绳，或者在管道内部使用。预穿示踪线可以避免断线，检测效果和外面一样，但是这样做的时候需要处理好内示踪线和外示踪线的连接。

6. During the construction of trenchless engineering, the tracer line outside the PE pipe is easy to be broken during the pipe dragging process. The simple method is to select steel wire or wire rope with larger cross-sectional area and higher strength, or use it inside the pipeline. Pre threading the tracer line can avoid disconnection, and the detection effect is the same as that of the outside, but the connection between the inner tracer line and the outer tracer line needs to be handled well.

7、在某些特殊情况下，燃气示踪线不能应用于PE管道。这时可以采用预埋示踪球的方法来满足未来检测定位的需要。

7. In some special cases, the gas tracing line cannot be applied to PE pipes. At this time, the method of embedding tracer balls can be used to meet the needs of future detection and positioning.

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