There are currently various types of tracer wires on the market, such as copper clad steel, copper core PVC insulated cables (hereinafter referred to as copper core wires), copper clad aluminum, and so on. Which tracing line is better and more conducive to long-term tracing and positioning management of buried gas pipelines? It is necessary to test the performance of the tracing line in order to choose a more suitable tracing line. Therefore, we conducted tests on the commonly used tracer lines for the three types of PE gas pipelines mentioned above, providing reference for the selection of tracer lines for PE gas pipelines in terms of their conductivity, anti-corrosion treatment of tracer line joints, and strength.

銅(tong)包(bao)鋼是(shi)由(you)鋼芯線(xian)和(he)緊密(mi)包(bao)覆其外的銅(tong)層(ceng)構(gou)成金(jin)屬(shu)芯，外側為PE防(fang)腐(fu)層(ceng)，銅(tong)起(qi)到傳(chuan)導(dao)弱電信(xin)號(hao)的作(zuo)用(yong)，鋼絲(si)則起(qi)到支撐作(zuo)用(yong)。銅芯電(dian)線(xian)壹(yi)般(ban)由(you)內(nei)層(ceng)的銅(tong)芯線(xian)、中(zhong)間層的絕(jue)緣包(bao)皮(pi)和(he)外層的(de)保(bao)護外皮組(zu)成。銅(tong)包(bao)鋁(lv)由(you)鋁(lv)芯線(xian)和(he)緊密(mi)包(bao)覆其外的銅(tong)層(ceng)構(gou)成金(jin)屬(shu)芯，外層為PE防(fang)腐(fu)層(ceng)。

Copper clad steel is a metal core composed of a steel core wire and a tightly wrapped copper layer, with a PE anti-corrosion layer on the outermost side. Copper plays a role in conducting weak electrical signals, while steel wire plays a supporting role. Copper core wires are generally composed of the innermost copper core wire, the insulation sheath of the middle layer, and the protective sheath of the outermost layer. Copper clad aluminum consists of an aluminum core wire and a copper layer tightly wrapped around it to form a metal core, with the outermost layer being a PE anti-corrosion layer.

由(you)於(yu)鋼質(zhi)燃(ran)氣(qi)管(guan)道(dao)外層的(de)防(fang)腐(fu)層(ceng)為具(ju)有絕(jue)緣、防(fang)腐(fu)性(xing)能(neng)的(de)塑(su)料(liao)層或(huo)塗(tu)層(ceng)，與(yu)銅包(bao)鋼、銅(tong)芯電(dian)線(xian)、銅(tong)包(bao)鋁(lv)等外層也(ye)為具(ju)有絕(jue)緣、防(fang)腐(fu)性(xing)能(neng)的(de)塑(su)料(liao)層結(jie)構(gou)相似。因(yin)此，我(wo)們(men)將兩(liang)者(zhe)等效(xiao)，通過采用(yong)PCM管(guan)道(dao)電(dian)流(liu)衰減率法[1]，對(dui)示蹤(zong)線(xian)防(fang)腐(fu)層(ceng)平(ping)均絕(jue)緣質(zhi)量進(jin)行(xing)檢(jian)測(ce)。檢(jian)測(ce)原理(li)是(shi)向(xiang)示(shi)蹤(zong)線(xian)施(shi)加(jia)某壹頻(pin)率(lv)的(de)電(dian)流(liu)信號(hao)，電流(liu)由(you)示(shi)蹤(zong)線(xian)向(xiang)遠(yuan)方傳遞(di)時(shi)會逐漸衰減。其衰減大(da)小(xiao)與(yu)示蹤(zong)線(xian)的(de)塑(su)料(liao)層的(de)絕(jue)緣電(dian)阻率(lv)有關，示蹤(zong)線(xian)塑(su)料(liao)層的(de)平(ping)均絕(jue)緣電(dian)阻率(lv)越(yue)高，電(dian)流(liu)衰減就(jiu)越(yue)慢，反(fan)之(zhi)則衰減越(yue)快。

Due to the fact that the outermost anti-corrosion layer of steel gas pipelines is a plastic layer or coating with insulation and anti-corrosion properties, similar in structure to the outermost plastic layer with insulation and anti-corrosion properties, such as copper clad steel, copper core wires, and copper clad aluminum. Therefore, we equate the two and use the PCM pipeline current decay rate method [1] to detect the average insulation quality of the trace line anti-corrosion layer. The detection principle is to apply a current signal of a certain frequency to the tracer line, and the current will gradually decay when transmitted from the tracer line to the distance. The magnitude of its attenuation is related to the insulation resistivity of the plastic layer of the tracer line. The higher the average insulation resistivity of the plastic layer of the tracer line, the slower the current attenuation, and vice versa, the faster the attenuation.

銅(tong)包(bao)鋼示(shi)蹤(zong)線(xian)在(zai)強(qiang)度(du)方面具(ju)有明顯(xian)的(de)優勢，在(zai)傳導(dao)探測(ce)信號(hao)方面也(ye)能(neng)夠(gou)滿(man)足探(tan)測(ce)示蹤(zong)需(xu)要，施(shi)工也較方便(bian)，如(ru)果(guo)接(jie)頭防(fang)腐(fu)處理(li)能做(zuo)好，這(zhe)種示蹤(zong)線(xian)性(xing)價(jia)比(bi)。

Copper clad steel tracer wires have obvious advantages in strength and can also meet the needs of detection and tracing in conducting detection signals. Construction is also more convenient. If the joint anti-corrosion treatment can be done well, this type of tracer wire has the highest cost-effectiveness.

銅(tong)芯電(dian)線(xian)示(shi)蹤(zong)線(xian)對(dui)探測(ce)信號(hao)的傳(chuan)導，但是(shi)接(jie)頭部位防(fang)腐(fu)做(zuo)法(fa)較(jiao)簡陋，不能保(bao)證接(jie)頭部位的(de)防(fang)腐(fu)質(zhi)量，且強(qiang)度(du)稍(shao)差(cha)，因(yin)此，銅(tong)芯電(dian)線(xian)不(bu)宜作為埋(mai)地燃(ran)氣(qi)管(guan)道(dao)的(de)示(shi)蹤(zong)線(xian)。

Copper core wire tracing lines have the best transmission of detection signals, but the anti-corrosion methods for the joint parts are relatively simple, which cannot guarantee the anti-corrosion quality of the joint parts, and the strength is slightly poor. Therefore, copper core wires are not suitable as tracing lines for buried gas pipelines.

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