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1¡¢ Pipeline marker pile

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The marker stakes set up along the pipeline are a visual and effective carrier for conveying pipeline protection information to people. The marker post for high-pressure natural gas pipelines has a height of over 1m above ground (as shown in Figure 1), which includes information such as the name of the pipeline's owner, pipeline direction, and contact phone number. Sign stakes are usually buried at corners and prominent areas, and along the sign stakes, one can roughly grasp the position and direction of the pipeline. It is prohibited to excavate the underground pipeline within a 5m range along the marked pile. If there is cross construction or adjacent emergency situations, please call the contact phone number on the pile.

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2¡¢ Communication pipeline marker post

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The communication pipeline marker post is used to indicate the position of communication optical cables for high-pressure natural gas pipelines. The communication optical cables are made of silicon pipes, and some non excavation parts are protected by PE sleeves. It contains independent optical cables for communication data transmission and emergency response within the station. The communication marker post is about 0.5 meters high and contains the ownership unit of the pipeline, pipeline direction, and contact phone number. Communication optical cables are of great significance for pipeline operation, and if external damage is caused, it will have a significant impact on pipeline operation.

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3¡¢ Pipeline warning signs

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The pipeline warning sign is yellow throughout the body, with a height of about 1.5m above ground. It is mainly installed in important river crossing links. The warning sign displays warning slogans such as "There are natural gas pipelines below, excavation, piling, and open flames are prohibited. If there are construction operations, please contact them in advance", and describe the underground routing of the pipeline with a red line, the name of the ownership unit, and the contact phone number. Another type of stainless steel pipeline warning sign (as shown in Figure 4) is a white background with red letters, mainly placed in key areas and intersections where pipeline intersections are prone to occur. The warning content includes: excavation, planting of deep rooted plants, drilling through holes, rolling, hot work, blasting operations, and other dangerous behaviors are strictly prohibited within a range of 5 meters on each side of the natural gas high-pressure pipeline. The name and contact phone number of the ownership unit are also included.

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4¡¢ Pipeline cathodic protection pile

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Pipeline cathodic protection piles are important accessories buried near pipelines to protect them. He can not only protect the anti-corrosion layer of pipelines, but also be used for line inspection, and is one of the important accessories of natural gas pipelines. The cathodic protection pile is made of metal material and has a yellow color. There is a stainless steel sign on the flat top of the pile, which is printed with the relevant number and mileage number. There is a small door on the pile body, and the cables inside are connected to the pipeline.

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5¡¢ Pipeline crossing sign

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Large and important signs for pipelines are mainly placed on both sides of important rivers where the pipeline crosses. The warning content includes: "Dredging, building docks, throwing and dragging anchors, digging mud and sand, piling, quarrying, underwater blasting and other illegal operations are prohibited within a 500 meter area on both sides of the pipeline crossing the river." Contact phone number, name of the owner unit, etc. The safety level of high-pressure natural gas pipelines crossing rivers is relatively high, and signs are mainly placed in prominent positions. If there is nearby construction, it is necessary to connect in advance.

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6¡¢ Pipeline warning tape

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According to the requirements, a warning tape with a width of about 0.5m and a color of yellow should be laid directly above the high-pressure natural gas pipeline during excavation. The content of the warning tape includes warning slogans prohibiting excavation, the name of the pipeline owner, and the contact phone number. In order to protect the safety of natural gas pipelines, if a warning tape is found during on-site excavation, construction needs to be stopped immediately and the contact phone number written above should be dialed for confirmation. Construction can only be carried out as required after professional personnel arrive to confirm.

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