① Due to the fixed rolling bearings in the packaging of copper clad steel and copper clad aluminum, the installation of PE gas pipelines is relatively simple and labor-saving compared to copper core wires.

②施工单位在对铜芯电线示踪线进行连接时，使用一般电工胶布缠绕连接，有些甚采用透明胶带进行缠绕连接，经现场实践检验，此种连接处理方式连接不牢固，强度不高，且无法起到有效的防水绝缘作用，经过一段时间地下水渗入会造成此处信号损失，影响日后PE燃气管道管位检测及管网运行管理工作。

② The construction unit uses general electrical tape to wrap and connect copper core wire tracing wires, and some even use transparent tape to wrap and connect. After on-site practice, it has been verified that this connection method is not firm, has low strength, and cannot effectively prevent water insulation. After a period of time, groundwater infiltration can cause signal loss here, This will affect the detection of PE gas pipeline locations and the management of pipeline operation in the future.

铜包钢有专用接头器，例如旋紧接头器、三通接头器，且连接强度高，只要施工人员将接头处处理合格，就有很好的防水绝缘效果，有利于延长示踪线的使用寿命。尽管铜包铝也有专用接头器，但是由于铜与铝的化学活性差异较大，一旦接头防腐处理不好，被土壤中的液体侵湿，会形成原电池，进而加速铜包铝示踪线发生电化学腐蚀，一般1～2a内就会完全腐蚀断掉，从而失去示踪作用。

Copper clad steel has special connectors, such as screw connectors and tee connectors, and the connection strength is high. As long as the construction personnel handle the joints properly, it has good waterproof and insulation effects, which is conducive to extending the service life of the tracer wire. Although copper coated aluminum also has specialized connectors, due to the significant difference in chemical activity between copper and aluminum, once the anti-corrosion treatment of the connector is not good and it is wetted by liquid in the soil, it will form a primary battery, which will accelerate the electrochemical corrosion of the copper coated aluminum tracer line. Generally, it will completely corrode and break off within 1-2 years, thus losing its tracing effect.

③铜芯电线的防腐保护层为PVC材料，其防水、防腐功能较好，但PVC材质容易老化，使示踪线使用寿命缩短；铜包钢与铜包铝的外防腐层为聚乙烯材质，即与PE管为同一材质，在具备了较好的防水性、防腐性的前提下，保证了与一起敷设的PE管道具有相同的使用寿命。

③ The anti-corrosion protection layer of copper core wires is made of PVC material, which has good waterproof and anti-corrosion functions. However, the PVC material is prone to aging, which shortens the service life of the tracer wire; The outer anti-corrosion layer of copper clad steel and copper clad aluminum is made of polyethylene material, which is the same material as PE pipes. With good waterproof and anti-corrosion properties, it ensures the same service life as PE pipes laid together.

④理论上示踪线只要能够连通导电即可，但实际的燃气工程施工中，选择示踪线要考虑到需要有一定的抗拉强度，如果示踪线强度不够，往往会在管道回填土或地面有下沉时被拉断而失去作用。在施工的过程中，难免会出现示踪线被拉断的现象，因此，选择示踪线时不仅应考虑探测信号的强弱，也要考虑示踪线自身材质的强度，以减少施工中出现拉断问题。

④ In theory, as long as the tracer line can be connected and conductive, but in actual gas engineering construction, the selection of the tracer line should consider the need for a certain tensile strength. If the strength of the tracer line is not enough, it will often be pulled off and lose its function when the pipeline is backfilled or the ground sinks. During the construction process, it is inevitable that the tracer line will be pulled off. Therefore, when selecting the tracer line, not only should the strength of the detection signal be considered, but also the strength of the material of the tracer line itself should be considered to reduce the problem of pulling off during construction.