In modern construction and engineering construction, pressure sealing technology, as an important construction means, is widely used in the maintenance and transformation of various pipelines, pressure vessels and equipment. This technology has gradually replaced the traditional shutdown maintenance method because of its efficient, economical and convenient characteristics, and has won the favor of more and more engineers and technicians. This paper will deeply discuss the basic concept, implementation process, technical advantages and application fields of sealing construction with pressure, in order to provide practical reference and guidance for practitioners.

1, the basic concept of pressure plugging

Sealing with pressure, as the name suggests, refers to the construction method that adopts certain technical means to seal the pipeline or equipment when it is still under pressure. Its core purpose is to ensure the normal operation of the system under the premise of necessary maintenance and overhaul. The realization of this technology usually depends on the plugging device and the related construction technology.

1.1 Principle of sealing with pressure

Pressure plugging technology uses specially designed plugging devices to prevent media leakage by sealing pipelines or equipment. The sealing device is usually composed of sealing material, supporting structure and connecting device. The construction personnel choose the appropriate equipment and materials according to the need to ensure that the system will not be affected during the operation.

### 1.2 Classification with pressure plug

According to application scenarios and technical requirements, pressure plugging can be divided into a variety of types, including:

- ** Pipeline plugging ** : Suitable for the maintenance of various media pipelines.

- ** Valve plugging ** : Used to repair or replace the valve.

- ** Tank plugging ** : Suitable for cleaning and maintenance of the inside of the tank.

- ** Equipment plugging ** : Maintenance of pressure vessels and other equipment.

Two, with pressure sealing construction process

Although the construction of pressure sealing is relatively simple, it still needs to follow a certain process to ensure construction and effect. The following are the general construction steps:

2.1 Preparation before construction

Before carrying out pressure sealing construction, it is necessary to make adequate preparations:

- ** Site investigation ** : Detailed investigation of the construction site to understand the operating status of the pipeline, the nature of the medium and the pressure level.

- ** Equipment selection ** : Select the appropriate plugging device according to the diameter, medium and pressure of the pipeline.

- ** Materials ** : Prepare sealing materials, support structures and other related equipment to ensure that they meet technical requirements.

- ** Assessment ** : To evaluate the construction risks, and formulate corresponding measures and emergency plans.

2.2 Construction and installation

After the preparation work is completed, the actual plugging construction is carried out, which mainly includes the following steps:

1. ** Cutting and cleaning ** : Cut the pipeline according to the design requirements, and clean the cutting surface to ensure that no impurities affect the sealing effect.

2. ** Sealing device installation ** : Install the selected sealing device to the cutting position to ensure that it is firm and reliable and can withstand the pressure in the pipeline.

3. ** Pressure test ** : After the installation of the sealing device, the pressure test is carried out to ensure good sealing performance and no leakage.

4. ** Welding fixing ** : If necessary, the sealing device can be welded to increase its firmness and tightness.

5. ** Restore the system ** : After the plugging device is installed and there is no water leakage, gradually restore the operation of the system to ensure its normal work.

2.3 Inspection after construction

After the completion of construction, it is necessary to conduct a comprehensive inspection of the plugging effect:

- ** Sealing effect test ** : Confirm the sealing effect of the sealing device through pressure testing and other methods.

- ** Stability monitoring ** : Continuously monitor the pressure changes and other stability indicators of the construction site to ensure that no abnormal conditions occur.

- ** Data archiving ** : Organize and archive relevant data and drawings in the construction process for subsequent reference.

3. Technical advantages with pressure sealing

The pressure sealing technology has a number of significant advantages over the traditional shutdown maintenance method:

3.1 High efficiency

With pressure sealing, the maintenance can be completed without stopping the operation of the equipment, which greatly reduces the maintenance time and improves the work efficiency. This is especially important in time-critical industrial environments.

### 3.2 Economy

Because there is no need to stop, sealing with pressure can effectively reduce production losses and save downtime costs. In addition, the construction cost of sealing technology with pressure is relatively low, and the economic benefits are significant.

### 3.3 Stability

Advanced construction teams are able to effectively assess and control risks and ensure personnel and equipment during the construction process. The modern plugging device uses high-strength materials and has good pressure resistance, which further improves the construction stability.

### 3.4 Flexibility

Pressure sealing technology has a wide range of applications, and can be constructed for different types of pipelines and equipment, and flexibly respond to various complex situations. This makes it have great adaptability in industrial production.

# 4. Application fields with pressure plugging

With the development of technology, the application range of pressure plugging technology continues to expand, covering a number of industries:

4.1 Oil and gas industry