Pressure plugging is a common construction process used to perform necessary maintenance and repairs in containers such as pipes, pools, storage tanks, etc. This process is characterized by the application of pressure to the sealing material into the pipe or container, thus effectively stopping the leakage and loss of media. This paper will introduce the construction technology of sealing with pressure in detail.

First, the principle of pressure sealing

Sealing with pressure refers to the use of tools such as expansion pipes or filling materials to completely block the inside of the pipeline to prevent media leakage and loss. The principle is to apply pressure to make the sealing material expand and fill the entire pipe to achieve the purpose of blocking. Sealing with pressure has the advantages of flexible use, good sealing effect and short construction time, and is widely used in various pipeline maintenance and repair fields.

2. Tools and materials with pressure sealing

Pressure plugging requires the use of some special tools and materials, including:

1. Expansion pipe: This is the main tool with pressure sealing, which can completely block the inside of the pipe. The expansion pipe should choose the model suitable for the inner diameter of the pipe, usually there are different specifications of the expansion pipe, you can choose the appropriate model for use.

2. Booster pump or compressed air pump: compressed air or liquid is needed to apply pressure in order to make the sealing material in the expansion pipe completely fill the pipe. The booster pump or compressed air pump should choose the model and specification suitable for the requirements of the construction site.

3. Sealing paste or filling material: Special sealing paste or filling material is needed to achieve complete sealing of the pipeline. Sealing paste and filling materials should be selected with good sealing performance and chemical corrosion resistance to ensure the quality and duration of construction.

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Third, the construction steps with pressure sealing

1. Cleaning the pipeline: the pipeline should be cleaned before construction to ensure that the surface of the pipeline is clean. If there are defects such as corrosion and welds on the surface of the pipeline, they need to be repaired after cleaning.

2. Install expansion pipe: Select an appropriate type of expansion pipe according to the inner diameter of the pipe and install the expansion pipe on the pipe to be blocked. Fixation methods such as braces or slings can be used if necessary.

3. Connect the pressure source: connect the conduit and pipe connection port of the booster pump or compressed air pump, and adjust the pressure and flow of the pump.

4. Press the sealing paste or filling material: Put the sealing paste or filling material into the inside of the expansion tube, and pay attention to control the density and uniformity of the filling.

5. Booster sealing: Open the booster pump or compressed air pump and apply enough pressure to expand the sealing material and completely fill the entire space of the pipeline.

6. Stop pressurization: Wait a certain amount of time for the sealing material to dry and finalize. Pressurization can be carried out several times according to needs to achieve a good sealing effect.

7. Remove the expansion pipe: After sealing is complete, remove the expansion pipe and clean up the site to restore the normal use of the pipeline.

4. Application fields with pressure plugging

Pressure sealing is widely used in various industrial pipelines, storage tanks and transportation equipment, water conservancy and hydropower fields. The details include:

1. High pressure liquid pipelines in petrochemical, chemical, pharmaceutical, food and other industries, such as compressed air pipelines, hydrocarbon airways, hydrogen pipelines, etc.

2. Sealing of media leakage and loss in storage tanks, storage tanks, spray cabinets and other containers, such as chemical product storage tanks, metal oil tanks, gas tanks, etc.

3. Maintenance and repair of oil and water pipelines and related equipment, such as oil pipelines, natural gas pipelines, pump control systems, etc.

In short, sealing with pressure is an efficient, reliable and stable pipeline maintenance and repair process, which has a wide application prospect and market demand.

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