Sealing with pressure refers to the sealing operation in the pipeline, usually used for pipeline shutdown or temporary reinforcement repair. This technology is to achieve the purpose of sealing the pipeline by extending the sealing material inside the pipeline, so that it seals the pipeline and forms an isolated area. This paper will introduce the production and forming process with pressure sealing, including preparation work, material preparation, equipment and technical requirements.

1. Preparation

1. Pipeline inspection and evaluation: Before performing pressure plugging, it is necessary to conduct pipeline inspection and evaluation. It mainly includes the following aspects:

(1) The size and length of the pipeline to determine the area that needs to be blocked.

(2) The actual situation inside the pipeline, including the condition of the pipeline, the material of the pipeline, the pressure of the pipeline, the medium in the pipeline, etc.

(3) The environmental conditions of the pipeline, including the geographical location of the pipeline, temperature, humidity, terrain conditions, etc.

2. Implementation of stabilization measures: Safety is the key when performing a pressure closure operation. There is a need to develop a stabilization plan and provide staff with the necessary stabilization training and protective equipment. To ensure the physical and life safety of the staff.

3. Preparation of tools and equipment: In order to successfully implement plugging with pressure, you need to prepare a series of tools and equipment, such as plugging materials, expansion equipment, pressure gauges, valves, pumps, etc. At the same time, it is also necessary to prepare some equipment, such as air, power, water and so on.

Second, material preparation

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1. Selection of sealing materials: Sealing materials are the key components of the sealing process with pressure. The selection of sealing materials needs to take into account the environmental conditions of the pipeline, the flow rate of the medium, temperature and pressure. Commonly used sealing materials include polyurethane, silicone rubber, acrylic acid and so on.

2. Preparation of sealing materials: Sealing materials need to carry out a series of preparatory work, such as cutting, coating, mixing, stirring, etc. The sealing material needs to be deployed according to the specific pipeline situation to ensure that it has sufficient adhesion and fluidity.

Equipment and technical requirements

1. Selection of expansion equipment: Expansion equipment is one of the main equipment with pressure sealing process. Commonly used expansion equipment includes expansion head, pneumatic compression pump, manual claw and so on. Expansion equipment needs to be selected based on pipe size, material characteristics, and the specific requirements of the plugging operation.

2. Application of technology: pressure plugging integrates a variety of technical means, and requires the use of certain technical knowledge to effectively operate. Such as the use of the expansion head, the pressure of the sealing material, the control of the pressure and the oxygen discharge in the pipeline, etc., all of which require the staff to master the corresponding technology and operating specifications.

3. Response to unexpected events: Although sealing with pressure is a safe and reliable technical means, there are still some unexpected events in the implementation process, such as pipeline explosion, sealing materials out of control and so on. Therefore, it is necessary to remain vigilant 24 hours a day and carry out pre-plan drills and emergency handling for possible accidents.

In general, the pressure plugging process is a complex technical operation that requires careful preparation and fine construction. The consideration of various factors and the application of technical knowledge are the key to ensure the success of sealing with pressure.

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