The pipeline uses pressure sealing technology; In the process of pipeline construction and maintenance, it is often necessary to enlarge the pipeline (that is, to change the diameter or length of the pipeline) to meet the new requirements. In the process of expansion, in order to ensure the normal operation of the pipeline, it is often necessary to use pressure sealing technology to prevent liquid or gas leakage. This paper will introduce the principle, method and application of pressure sealing technology in pipeline in detail.

First, the principle of pressure plugging technology

Pressure plugging technique is a method of stopping the fluid in the pipe or pipe by applying external pressure. Its principle is based on the following key points:

1. Pressure balance: In the process of the pipeline, due to the change of the diameter or length of the pipeline, a certain pressure difference will be generated. Pressure plugging technology prevents leakage by applying the appropriate external pressure to balance the pressure difference between the inside and outside of the pipe.

2. Sealing material: Sealing technology with pressure requires the use of a material with good sealing performance to fill the pipeline to achieve the purpose of sealing. Commonly used sealing materials include rubber plug, expansion plug, soft metal plug and so on.

3. Sealing method: pressure sealing technology has a variety of sealing methods to choose from, including mechanical sealing, water sealing, gas sealing and so on. The choice of the appropriate sealing method depends on the nature of the pipeline, the sealing requirements of the working conditions and other factors.

Method with pressure plugging technology

According to different sealing requirements and pipeline conditions, pressure sealing technology can be used in a variety of methods. Are several common methods:

1. Mechanical blocking: Mechanical blocking is the use of mechanical devices to fix the blocking material inside the pipeline to achieve the blocking effect. The commonly used mechanical plugging devices, including pipe clamps, clamps and other mechanical plugging devices, are suitable for small diameter pipelines, simple construction and convenient, but the selection and installation of plugging materials are higher requirements.

2. Water sealing: Water sealing is the use of water pressure to push the sealing material into the pipeline to form a seal. Water plugging is suitable for pipelines with larger diameters and has better plugging effect, but sufficient water and corresponding plugging equipment need to be prepared in advance.

3. Gas sealing: Gas sealing is the use of gas pressure to push the sealing material into the pipeline to form a seal. Gas sealing is suitable for situations that require high sealing materials, such as high temperature, high pressure and other special conditions.

4. Expansion plugging: Expansion plugging is to achieve the sealing effect by expanding the sealing material. Expansion plugging is mainly suitable for small diameter pipes, and the sealing material is usually a rubber or plastic with expansion properties.

5. Soft metal sealing: Soft metal sealing is to use soft metal materials with good plasticity and plug them into the inside of the pipeline to form a seal. Soft metal sealing is suitable for the application of pressure resistance and corrosion resistance of the sealing material

Pressure plugging technology is widely used in pipeline engineering. Here are some common application scenarios:

1. Pipeline expansion: When the pipeline needs to be carried out, the pressure sealing technology can ensure that no liquid or gas leakage will be caused in the process to ensure the safe construction.

2. Pipeline maintenance: In the process of pipeline maintenance, it is often necessary to locally plug the pipeline in order to maintain or replace the pipeline parts. Pressure plugging technology can provide temporary plugging measures to ensure that no liquid or gas leaks occur during maintenance.

3. Pipeline test: After the pipeline installation is completed, it is often necessary to carry out pressure test or leak test. Pressure plugging technology can provide temporary plugging measures to ensure the accuracy of the test.

4. Pipeline leakage repair: When the pipeline leaks or leaks, pressure sealing technology can provide a quick repair method to reduce the damage of leakage to the environment and equipment.

In SUMMARY:

Pressure plugging technology is a common technology in pipeline engineering, it is widely used in pipeline, maintenance, inspection and leak repair scenes by applying external pressure and using appropriate sealing materials to stop the fluid in the pipeline. In practical application, it is necessary to choose the appropriate sealing method and sealing material according to the specific situation to ensure the normal construction pipeline