First, the definition of pipeline with pressure sealing

Pipeline with pressure sealing refers to the case that there is pressure in the pipeline, take a certain method to block the pipeline in order to carry out smooth maintenance or replacement of pipe parts. The factors to be considered in pipeline sealing include the material of the pipeline, the pressure, the working medium, the ambient temperature and so on.

Second, the pipeline with pressure sealing method

1. Metal sealing: The method of metal sealing is mainly for the small diameter of the pipeline or the opening of the edge of the pipeline. Metal sealing includes two methods: one is to use metal sheet to press the pipe mouth to seal; The other is to use a metal ring with an adjustable device, which is placed at the pipe mouth for sealing.

2. Rubber sealing: Rubber sealing is mainly for the pipeline has a large opening or the interface of the pipeline to be blocked. Rubber sealing is the use of elastic rubber material to seal the pipeline, through the external pressure to fill the rubber pipe mouth, in the sealing effect. Rubber sealing is flexible and can adapt to different shapes of pipes.

3. Layer gasket sealing: Layer gasket sealing is mainly for the interface of the pipeline. Layer gasket sealing is the installation of multiple layers of gaskets at the pipe interface, and the gasket is pressed to a certain pressure before the sealing effect is produced, so that it is fixed, and the liquid leakage of the pipeline can be prevented.

4. Packing: Packing is the sealing of the pipeline by filling asbestos, sand and other particles or gas-liquid mixture, which is more flexible and can block large caliber or complex pipelines. The technology of packing is mature and has the characteristics of low cost and good stability.

5. Belt gauge (buckle) sealing: belt gauge (buckle) sealing is mainly used for discharging part of the leakage of the medium. Belt gauge (buckle) sealing is through a ring structure and the seal of the buckle to form a solid sealing device. Belt gauge (buckle) sealing good sealing, suitable for all kinds of pressure pipeline.

6. Expansion pipe sealing: Expansion pipe sealing is to block the pipe with large diameter and uncertain interface position. To seal the expansion pipe, install the expansion pipe at both ends of the pipe, and install a pad with a certain thickness in the spare part of the pipe, so that the expansion pipe is blocked at the mouth of the pipe, so as to seal the pipe.

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7. Diaphragm plugging: diaphragm plugging is to use the diaphragm at the pipe mouth to seal the diaphragm at the pipe mouth to achieve the sealing of the pipe. Diaphragm plugging is flexible and can be adapted to different pipe shapes and pressure levels.

8. Other sealing methods: In addition to the above sealing methods, there are other sealing methods under special circumstances, such as the use of temporary mechanical pressure relief devices or the temporary sealing method of emptying the pipeline. These methods are temporary sealing methods to meet the needs of pipeline sealing with pressure under specific circumstances.

Third, the pipeline with pressure sealing precautions

1. The sealing method of pipeline with pressure needs to be evaluated and a reasonable plan formulated.

2. The plugging work needs to be carried out in the place where no one enters, and the operator needs to carry out stable protection.

3. The sealing work needs to protect the surrounding environment and materials to avoid impact on the environment and personnel.

4. Before plugging, clean the media in the pipeline and take necessary measures to prevent media leakage.

5. The sealing method should be adjusted according to the pipeline conditions and actual conditions to ensure stable and effective sealing.

6. In the process of sealing operation, it is necessary to strictly abide by the smooth operation specification and relevant laws and regulations to ensure the smooth operation.

7. After the pipeline is sealed with pressure, the pipeline needs to be accepted to ensure that the sealing effect meets the requirements.

Fourth, the advantages and disadvantages of pipeline with pressure sealing

The advantage of pipeline sealing with pressure is that the pipeline can be blocked while maintaining pressure, reducing the impact of pipeline shutdown on normal production. In addition, the repair and replacement of pipeline with pressure sealing can also improve work efficiency and reduce production costs. The plugging method adopted in the plugging process can also be adjusted according to the specific situation to ensure the sealing effect and stability.

The disadvantage of pipeline sealing with pressure is that the sealing process requires strict construction control, and the operation is relatively difficult. Plugging may affect the site environment, pipeline materials, and equipment. Therefore, preventive measures must be taken. In addition, in some cases, the plugging can not achieve the effect of complete plugging, which has hidden dangers for the smooth operation of the equipment.

To sum up, the selection and implementation of pipeline sealing with pressure should be based on the situation and actual needs of the pipeline, combined with the corresponding pipeline sealing methods, giving full consideration to various factors, and strictly complying with relevant regulations to ensure the effectiveness of the work.

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