Pipeline refers to the equipment used to transport fluid, gas or solid particles, which is widely used in industrial production, water supply, gas supply, sewer and other fields. In some special cases, it is necessary to use a line with pressure closure to avoid leakage or shutdown losses. Common methods and applications for sealing pipes with pressure are described in detail below.

1. Pipeline method with pressure sealing:

1. Flange sealing: Flange is a common way of pipeline connection, with strong versatility, solid connection and other advantages. On the pipe that needs to be blocked, the flange sealing method can be used. First, flanges are welded at both ends of the pipe, and then sealing gaskets are installed on the flanges, and the flanges are fastened together by bolts, so as to achieve the sealing of the pipe.

2. Expansion plug plugging: Expansion plug is a common pipeline plugging tool, which can be inflated or injected to expand and seal the pipeline. The expansion plug is generally made of rubber or other elastic materials, and has the characteristics of corrosion resistance and high pressure resistance. On the pipe that needs to be blocked, insert the expansion plug into the pipe, and then inflate or inject water to make it expand and closely fit the inner wall of the pipe to achieve the sealing effect.

Plugging: Plugging is a common pipeline plugging tool, usually made of metal, with high temperature resistance, pressure resistance and other characteristics. On the pipe that needs to be blocked, place the plug inside the pipe, and then fix it inside the pipe by bolts or other fixing methods to achieve the sealing effect.

Second, the application of pressure blocked pipeline:

1. Emergency maintenance: In the event of leakage or other damage to the pipeline, in order to avoid continued leakage or shutdown losses, emergency maintenance can be carried out using the method of sealing the pipeline with pressure. By blocking the pipeline, the leakage of fluid or gas can be temporarily prevented to ensure the stability of the working environment.

2. Construction process: In some special construction processes, the pipeline needs to be temporarily blocked in order to carry out other work. For example, when welding pipes, the pipe needs to be blocked to stop gas or liquid leakage during the welding process. Through the method of sealing the pipeline with pressure, the process requirements can be effectively completed.

3. Pipeline test: In the pipeline test, the pipeline needs to be tightly blocked to ensure the accuracy of the test results. The method of sealing the pipeline with pressure can provide a reliable sealing effect and ensure the smooth conduct of the test.

To sum up, pipe closure with pressure is a common and important technical means, which can quickly and effectively plug the pipe when needed to avoid leakage or downtime losses. In practical applications, suitable plugging methods can be selected according to the specific conditions, such as flange plugging, expansion plug plugging or plug plugging. Pipeline with pressure closure has a wide range of applications, including emergency maintenance, construction technology and pipeline testing. By correctly using the method of sealing the pipeline with pressure, the stable operation of the pipeline and the smooth progress of the process can be ensured.