在燃氣PE管道運行交接中，對示蹤線的符合性檢查有5項：①信號接人點有否，并安裝正確。

During the handover of gas PE pipeline operation, there are 5 compliance checks for the tracer line: ① Whether the signal connection point is present and installed correctly.

②檢測信號能加載到示蹤線上，中間故障太多，泄漏嚴重，中間沒有檢測井。③安裝了示蹤線，始端末端剪斷懸空，與大地不接觸，中間閥井內(nèi)示蹤線未作固定處理。④示蹤線線徑太小，不能滿足檢測信號傳輸要求，容易被施工挖斷或自然應力破壞。

② The detection signal can be loaded onto the tracer line, but there are too many faults and severe leaks in the middle, and there is no detection well in the middle The tracer line was installed, with the beginning and end cut and suspended in the air, without contact with the ground. The tracer line in the middle valve well was not fixed. ④ The diameter of the tracer line is too small to meet the transmission requirements of the detection signal, and it is easy to be cut off by construction or damaged by natural stress.

⑤PE管道地表標志憑安裝記憶印象埋設，密度不足，偏離較大。

⑤ The surface markings of PE pipelines are buried based on installation memory impressions, with insufficient density and significant deviation.

探測信號不能保證連續(xù)暢通，主要原因有5個：①示蹤線中的導線沒有連接，造成斷路。②示蹤線沒做絕緣和防水處理，造成信號短路。③金屬導線導電面積不夠，造成信號傳輸電阻大，信號衰減大。④示蹤線本身不合格，導線發(fā)生斷裂不連續(xù)。⑤示蹤線首端末端都未作連接固定與接地處理，被剪斷或者掩埋，找不到頭子。

There are five main reasons why the detection signal cannot be continuously unblocked: ① The wires in the tracer line are not connected, causing an open circuit. ② The tracer line was not insulated and waterproof, causing a short circuit in the signal Insufficient conductive area of metal wires leads to high signal transmission resistance and high signal attenuation The tracer line itself is not qualified, and the wire is broken and discontinuous. ⑤ The first and last ends of the tracer line were not connected, fixed or grounded, cut or buried, and the head could not be found.

無露出的探測信號源。PE管道示蹤線沒有信號的接點設計或沒有按照接點設計安裝，許多單位在示蹤線安裝中將示蹤線接頭直接埋人地表下或?qū)⑹聚櫨€接頭直接纏于管道或設備上，在很短的時間內(nèi)，示蹤線接頭就將無從找尋，從而造成整條示蹤線失去作用。

No exposed detection signal source. The PE pipeline tracer line does not have a signal contact design or is not installed according to the contact design. Many units bury the tracer line joint directly below the ground or wrap the tracer line joint directly on the pipeline or equipment during the installation of the tracer line. In a short period of time, the tracer line joint will be lost, resulting in the entire tracer line losing its function.

面積太小，強度不夠。金屬導線截面積選擇不正確，選擇示蹤線前要確定使用什么探測儀，不同的探測儀有不同的探測原理和方法，需要選用具有針對性的示蹤線。金屬導線截面積的選擇需要根據(jù)探測儀信號發(fā)生器的信號強度，設計管道所需探測距離來選擇金屬導線類型和導線的截面積。一般情況下2.5mm2的銅芯線一次性可探測距離可以達到500~1000m。直接法會更遠，施工中也很少出現(xiàn)拉斷的現(xiàn)象。

The area is too small and the strength is not enough. The selection of the cross-sectional area of the metal wire is incorrect. Before selecting the tracer line, it is necessary to first determine which detector to use. Different detectors have different detection principles and methods, and targeted tracer lines need to be selected. The selection of the cross-sectional area of metal wires requires selecting the type of metal wire and the cross-sectional area of the wire based on the signal strength of the detector signal generator and the required detection distance of the pipeline. In general, a 2.5mm2 copper core wire can have a detectable distance of 500-1000m at once. The direct method will go further, and there is rarely a phenomenon of pulling and breaking during construction.

以警示帶代替示蹤線。以警示帶代替示蹤線，又未按標準要求敷設。

Replace the tracer line with a warning tape. Replacing tracer lines with warning tapes and not laying them according to standard requirements.