Pipe pressure plugging is a common engineering practice used to temporarily close a fluid or gas transmission line for repair, overhaul, or emergency treatment. In practical applications, there are many common ways to seal pipelines with pressure. I will explain the following common methods in detail.

1. Gate valve plugging: Gate valve is a common plugging device that controls the opening and closing of fluid or gas by rotating the spool. In a pipe with pressure closure, the transfer of fluid or gas can be blocked by closing the gate valve. Gate valve has the characteristics of simple structure, good sealing and so on, and is often used in the sealing of small and medium diameter pipelines.

2. Butterfly valve plugging: Butterfly valve is a valve made of metal plate or elastic material, which controls the opening and closing of fluid or gas by rotating the valve disc. The butterfly valve has the advantages of simple structure, convenient opening and closing, etc., and is suitable for the sealing of large diameter pipelines.

3. Plug plugging: Plug is a device specially designed to plug pipes, usually made of metal, with good sealing performance. The plug plug can be applied to pipelines of various calibers, and prevents the transmission of fluid or gas by installing on the internal plugging point of the pipeline.

4. Piston plugging: The piston is a sealing device that can move in the pipeline and block the pipeline through the movement of the piston. Piston sealing has the advantages of good sealing and high reliability, and is suitable for various pressure and flow pipes.

5. Expansion plug plugging: Expansion plug is a kind of elastic plugging device, which expands by inflating or injecting water to seal the pipeline. The expansion plug is suitable for sealing pipes of various calibers and materials, and has the advantages of simple operation and good sealing effect.

6. Pipe clamp sealing: Pipe clamp is a fixture for sealing pipes, usually composed of two clamps and a sealing gasket. By tightening the fixture, it is clamped on the pipeline to achieve the sealing of the pipeline. Pipe clamp sealing is suitable for pipes of various calibers and materials, easy to operate and easy to install.

7. Diaphragm plugging: diaphragm is a sealing device made of flexible material, which is covered by the diaphragm on the pipe mouth to achieve the effect of blocking the pipe. Diaphragm sealing has the characteristics of good flexibility, high pressure resistance, corrosion resistance, etc., suitable for various pressure and flow of the pipeline.

8. Air bag plugging: The air bag is an inflatable plugging device, which inflates the air bag and compacts it inside the pipeline to achieve the plugging of the pipeline. Air bag sealing is suitable for pipelines of various calibers and materials, and has the advantages of simple operation and good sealing effect.

9. Back pressure valve plugging: The back pressure valve is a valve with automatic closing function, which is suitable for sealing when the upstream of the pipeline produces higher pressure. The back pressure valve opens and closes the valve by sensing pressure changes upstream of the pipeline to control the transfer of fluid or gas.

10. Wire harness plugging: Wire harness plugging is a method to block the pipeline by binding or casing. The purpose of sealing the pipeline is to bind or casing the pipeline with materials such as ropes or metal belts.

The above are the common ways of pipeline pressure sealing, and each way has its own applicable scenarios and advantages. In actual operation, it is necessary to select the appropriate sealing mode according to the specific pipeline conditions and sealing requirements, and perform operations in strict accordance with the operating rules to ensure the sealing effect and stable work.