Forced cooling gas steel pipeline pressure repair welding method

A technology of forced cooling and welding methods, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of residents' production, life inconvenience, gas supply interruption, etc., achieve convenient maintenance, reduce possibility, and avoid losses Effect

Pending Publication Date: 2018-12-25
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to repair the damaged part of the pipeline when the existing gas leaks. It is necessary to repair the damaged part of the pip

Method used

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  • Forced cooling gas steel pipeline pressure repair welding method
  • Forced cooling gas steel pipeline pressure repair welding method
  • Forced cooling gas steel pipeline pressure repair welding method

Examples

Experimental program
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Example Embodiment

[0022] Specific implementation mode 1: Combination Figure 1-Figure 4 To explain this embodiment, a forced-cooling gas steel pipeline under-pressure repair welding method of this embodiment is implemented according to the following steps:

[0023] Step 1. According to the size of the leakage opening of the main pipe 5, prefabricate the plugging base 1. The plugging base 1 includes a circular arc patch plate 1-1, a lower plugging cap 1-2 and a drainage flange 1-3. A leak hole is provided in the center of the arc patch plate 1-1, the lower surface of the arc patch plate 1-1 is attached to the outer wall of the parent pipe 5 to be repaired, and the leak hole in the center of the arc patch plate 1-1 is connected to the parent pipe. 5 Corresponding to the leakage port, the lower plugging cap 1-2 is welded and sealed with the upper end surface of the arc patch plate 1-1, and the upper inner side wall of the lower plugging cap 1-2 is welded and sealed with the edge of the drainage flang...

Example Embodiment

[0027] Specific implementation manner two: combination figure 1 , figure 2 with Figure 4 This embodiment will be described. This embodiment is a forced cooling gas steel pipeline under-pressure repair welding method. In step 1, the size of the central leakage hole of the arc patch plate 1-1 is based on the size of the leakage point of the parent pipe 5. The distance between the edge of the leak hole in the center of the arc patch plate 1-1 and the leak point of the parent pipe 5 to be repaired is 5-10mm. The other composition and connection relationship are the same as in the first embodiment.

Example Embodiment

[0028] Specific implementation mode three: combination figure 1 , figure 2 with Figure 4 The present embodiment will be described, a method of underpressure repair welding for a forced cooling gas steel pipeline in this embodiment. In step 1, the drainage flange 1-3 is a standard component, the outer diameter of the drainage flange 1-3 is 70-100mm, and the drainage flange 1-3 is provided with an internal threaded hole with a diameter of 15mm. The drainage method The diameter of the orchid 1-3 is the same as the diameter of the lower blocking cap 1-2. Other components and connection relationships are the same as those in the first or second embodiment.

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Abstract

The invention relates to a forced cooling gas steel pipeline pressure repair welding method. The invention solves a problem that when a gas pipeline is damaged, gas needs to be shut down so as to weldand repair a damaged position causing interruption of gas supply and bringing inconvenience to the lives of residents. The forced cooling gas steel pipeline pressure repair welding method has the technical key points that according to the size of a leakage hole of a mother pipeline, a plugging base is prefabricated; the pipeline surface near a leakage point of the mother pipeline is cleaned up, and according to the size of the leakage point of the mother pipeline, a filler is selected to plug the leakage point; soft cooling copper pipes are wound on both sides of a repaired position, a clamping force of a clamp is regulated, gas tightness of a to-be-welded position is detected by soapy water, cold water is connected into the cooling copper pipes, and the periphery of an arc complementaryplate and the outer wall of the mother pipeline are subjected to welding sealing; a drainage hose is removed, a plugging screw is screwed on, and an upper plugging cap and a lower plugging cap are welded; and the welding is completed. The method disclosed by the invention is used for welding the damaged gas pipeline.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a pressure repair welding method for a forced cooling gas steel pipeline. Background technique [0002] When the steel gas pipeline is damaged due to corrosion or external force, resulting in gas leakage, it is necessary to repair the damaged part of the pipeline to ensure environmental safety and reduce economic losses. The usual practice is to repair the damaged part of the pipeline after stopping the gas transmission. Suspension and repair will lead to the interruption of gas supply, which will bring a lot of inconvenience to residents' production and life. For example, the online welding repair of the pipeline can ensure the continuity of the pipeline operation and avoid various losses caused by the shutdown and repair to the greatest extent. Therefore, it is of great significance to establish a safe, scientific and rapid online repair technology for gas pipeline leakage. ...

Claims

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Application Information

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IPC IPC(8): B23K9/167
CPCB23K9/167
Inventor 王智学刘永滨冯立德张宏伟梁海滨杜华张季娜徐哲
Owner PETROCHINA CO LTD
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