Pressure sealing of gas pipeline refers to applying a certain pressure inside the pipeline, using a specific method to prevent the flow of gas in the pipeline to achieve the purpose of maintaining the pipeline.

Before plugging a gas pipeline with pressure, it is necessary to check and evaluate the pipeline. The purpose of the assessment is to determine the site to be plugged, the pressure range, and the plugging tools and materials to be used. The inspection can be carried out by detecting the pressure, temperature, flow rate and ambient gas content of the gas pipeline.

Common gas pipeline pressure sealing methods include the following:

1. Expansion pipeline with pressure sealing method

The method is to install an expansion belt at the pipe entrance, and then use air or other compressed gas to expand the belt to achieve the purpose of blocking the pipe. This method is suitable for the general sealing of small and medium diameter pipelines.

2. Expansion ball pipeline with pressure sealing method

The method is to put the expansion ball into the pipeline through a certain aperture in the pipeline that is smaller than the diameter of the ball, and then expand through the expansion ball to seal the pipeline. This method is suitable for annular sealing of pipeline and simple pipeline structure.

3. Expansion rubber pipe with pressure sealing method

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The method is to install a rubber bag at the pipe mouth and inflate the rubber bag to achieve the purpose of blocking the pipe. This method is suitable for large diameter and long distance pipeline.

4. Sediment removal pipeline with pressure sealing method

The method is to inject a certain cleaning liquid into the pipeline, remove the sediment in the pipeline, and then install the plugging device to achieve the purpose of sealing the pipeline with pressure.

In the process of sealing gas pipelines with pressure, the following points need to be noted:

1. Before plugging, clean and exhaust the pipeline to ensure the plugging quality and prevent accidents.

2. It is necessary to check the quality of the sealing equipment and materials to ensure that they meet the requirements to avoid the sealing failure caused by the poor quality of the equipment and materials.

3. During plugging, determine the plugging position and pressure range according to the specific conditions, master the pressure changes during the plugging process, and adjust them in time.

4. After the plugging is complete, check and remove the plugging tools one by one to ensure that the pipeline is working properly.

The pressure sealing of gas pipelines is a technical work, which needs to be operated by the main personnel with relevant skills and experience, and follow the relevant operating procedures and stability measures to ensure the construction quality and personnel safety.

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