Precautions for pressurized plugging of high-pressure gas pipelines

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Precautions for pressurized plugging of high-pressure gas pipelines: Unexpected accidents can occur during construction, leading to casualties, financial losses, and even death. Accidents are inevitable, but sometimes what causes an accident is not an accident itself but a mistake made by the technicians. It is most often some simple technical procedures; the simpler they are, the more carelessness tends to occur, which in turn leads to operational errors. Remember that the operating procedures at any construction site must be followed as predetermined. If things are not done according to the pre-established plan, unexpected accidents may occur. Today, we will discuss the precautions to be taken when performing plugging under pressure. Pipeline sealing work during foundation pit excavation: For the sealing of foundation pits, the team leader should give unified instructions to the excavators during construction, and people should be evacuated from the site. In the event of any injuries, the emergency response plan should be activated immediately; to prevent landslides, a certain slope must be maintained around the operation pit to avoid blockages. In the event of a landslide, students should be organized to clean it up immediately. Soldering blockage at the tee joint: During welding, the oil pressure in the pipes must be reduced to 2.0 MPa or less, and cooling water should be used for cooling. When using a welder, take precautions to avoid arcs that could cause eye injuries; in the event of any injury, seek medical treatment immediately, and protective equipment must be worn. In the event of burn-through, it should be immediately sealed off using welding rods; wherever there is a blockage caused by fire, the emergency response plan must be activated right away. Sealed openings: Before making any openings, it is essential to carry out pressure testing in accordance with the **safety management operating procedures and specifications. If oil leakage occurs during the opening process, effective measures must be taken immediately to locate the source of the leakage and eliminate it ； In the event of a fire, the emergency response plan should be activated immediately. If the tool gets stuck, the valve should be stopped immediately, the cause analyzed, and then restarted; if the tool is damaged and no longer functional, the valve cover should be closed and a spare tool installed. Sealing of pipeline materials: When sealing pipelines using technical methods, it is necessary to follow the principle of \"high pressure first, then low pressure; inner side first, then outer side\" – that is, seal the high-pressure end first and then the low-pressure end. When inserting the plug, if the drain valve on the clamp valve does not close properly, oil leakage or fire may occur; in such cases, the emergency response plan must be activated immediately. The operation safety plan should be developed before making any openings or closures in the pipeline while it is under pressure. When plugging leaks under pressure, safety protective equipment must be worn. When constructing pressure grooves and inspection wells, attention should be paid to the ambient temperature to prevent leaks caused by oxygen deficiency; otherwise, the incidence of leaks may even exceed what can be controlled. There are many methods for sealing pipes under pressure. Before carrying out pressure-sealing repairs, it is necessary to determine the nature of the leakage issue and develop a feasible technical plan for such repairs. Regarding emergency response measures, regular and reliable maintenance should be carried out during normal pipeline maintenance. With multiple tapping and blocking lines, it can also be utilized. If different alloys are used for plugging the leaks, the outer surface can still be repaired by using traditional welding patches. The above is a brief overview of the precautions to take when performing plugging under pressure; only the most important points have been mentioned. Everyone must remember that safety comes first, with everything else being secondary.