Before choosing the correct method of sealing with pressure, we first need to understand the concept and principle of sealing with pressure. Pressure plugging is a common engineering technique used to stop the leakage or flow of fluid in a pipeline or equipment. It usually includes the selection, installation and operation of the plugging equipment.

The correct choice of pressure sealing method needs to consider the following key factors:

1. The characteristics of the pipeline or equipment: understanding the material, pressure, temperature and other characteristics of the pipeline or equipment is the basis for selecting the sealing method with pressure. Different materials and pressure levels of pipes and equipment require different types of sealers.

2. Location and size of the leak point: Determining the exact location and size of the leak point is an important basis for selecting the sealing method with pressure. Leakage points may be located in different positions of the pipeline, such as valves, interfaces, welding joints, etc., so it is necessary to select the appropriate sealing equipment according to the location of the leakage point.

3. Selection of plugging equipment: according to the location of the leak point, material and pressure level, choose the appropriate plugging equipment. Commonly used plugging devices include plugging ball, plugging tape, plugging film and so on. Factors such as pressure resistance, corrosion resistance and sealing performance need to be considered when selecting a sealing appliance.

4. Selection of sealing method: according to the nature of the leakage point and the working condition of the pipeline, choose the appropriate sealing method. Common plugging methods include filling plugging, hydraulic plugging and mechanical plugging. Inflatable sealing is suitable for small and medium diameter pipelines, hydraulic sealing is suitable for high pressure large diameter pipelines, mechanical sealing is suitable for welded joints and flange interfaces.

5. Installation and operation: The correct installation and operation of the plugging device is the key to ensure the plugging effect. Before installing the plug, clean and inspect the leak point to ensure that the surface is smooth. When installing the plugging device, follow the relevant operating procedures to ensure the stability and reliability of the plugging device.

6. Regular maintenance and inspection: After selecting the plugging method with pressure, it is necessary to regularly maintain and check the status of the plugging device. Periodically check the sealing performance and pressure resistance of the plugging apparatus, and replace the aging or damaged plugging apparatus in time.

In short, the correct selection of the sealing method with pressure needs to be considered according to the characteristics of the pipeline or equipment, the location and size of the leak point, the selection of the sealing appliance, the selection of the sealing method, and the installation and operation. In practical applications, technical assessment and risk analysis need to be carried out according to the specific situation to ensure the stability and reliability of the operation with pressure closure.

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