示蹤線安裝于PE管道中要注意的問題

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

在PE管道的運行和交接中，檢查示蹤線的合規(guī)性有5項：

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

①檢查信號接入點是否存在和安裝是否正確。

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

②可在示蹤線上加載檢測信號，中間故障太多，漏電嚴重，中間沒有檢測井。

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示蹤線安裝，首尾截斷懸空，不與地面接觸，中間閥井示蹤線不固定。

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示蹤線直徑太小，不能滿足檢測信號傳輸?shù)囊螅菀妆皇┕じ顢嗷蚴茏匀粦p壞。

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管表面標志按安裝記憶印象埋設(shè)，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.

不能保證檢測信號的連續(xù)平滑。主要原因有五個：

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

①示蹤劑中的導線未接好，導致斷路。

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

②示蹤線沒有絕緣防水，導致信號短路。

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

③金屬線的導電面積不夠，導致信號傳輸電阻大，信號衰減大。

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

④示蹤線本身不合格，斷絲不連續(xù)。

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

⑤示蹤線頭端未連接、固定、接地，剪斷或埋入，找不到頭。

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

沒有暴露的探頭信號源。

No exposed probe signal source.

PE管道示蹤線無信號觸點設(shè)計或未按觸點設(shè)計安裝。很多單位在示蹤線安裝時直接將示蹤線接頭埋在地表下或?qū)⑹聚櫨€接頭直接包裹在管道或設(shè)備上。在短的時間內(nèi)，將無法找到示蹤關(guān)節(jié)，導致整個示蹤劑變得無用。

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.

面積太小，強度不夠。

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

金屬絲截面積的選擇不正確。在選擇示蹤線之前，有必要確定使用哪個檢測器。不同的探測器有不同的探測原理和方法，需要選擇有針對性的示蹤線。金屬絲截面積的選擇需要根據(jù)探測器信號發(fā)生器的信號強度和設(shè)計管道所需的探測距離來選擇金屬絲的種類和截面積電線。一般情況下，2.5mm2銅芯線的一次檢測距離可達500~1000m。直接法會更遠，施工時很少出現(xiàn)拉斷現(xiàn)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.

用警告膠帶更換管道示蹤線。示蹤線由警示膠帶代替，未按標準要求鋪設(shè)。

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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