Pressure plugging is a common technique used in pipeline improvement, replacement and installation, and its operation procedure requires attention to a series of details. Based on technical specifications and practical experience, this paper will comprehensively introduce the process and key points of sealing with pressure, so that engineers and operators can grasp the correct operation methods and precautions.

I. Overview of sealing technology with pressure

Pressure plugging technology is a technology that blocks a section of pipe in a pipeline for repair, replacement or installation. The principle is to use a stopper to completely isolate the fluid in the pipeline to prevent leakage or gas leakage, so as to ensure stable construction and reduce interference with the process. Sealing with pressure can be divided into two ways: one-way sealing and two-way sealing. In general, which way to choose needs to be evaluated according to the specific situation.

Second, the process with pressure plugging

1. Prepare

Before performing a pressure plug, you first need to make preparations, including but not limited to the following:

(1) Understand the type, size, medium, pressure and other parameters of the pipeline to ensure that the selected stopper meets the conditions of use of the pipeline.

(2) The plugging point is measured and marked to determine the type and number of the plugging device that should be selected.

(3) Check whether the occluder is intact and meets the standards for use.

(4) Check whether there is water leakage, natural gas leakage and other problems at the connection point of the pipeline, and clean and dry if necessary.

2. Install the occluder

The following points need to be noted when installing the plug:

(1) Confirm that the parameters such as the caliber, material and larger working pressure of the occluder used meet the requirements of the pipeline.

(2) Before installing the occluder, it is necessary to adjust and test it first to ensure that it is in good working condition.

(3) Put the stopper into the pipeline, and use a screw or manual pressure device to quickly inflate the stopper until it is stable.

(4) Modify the size of the stopper to fit the diameter of the pipe by tightening the nut or other means.

3. Stress test

After installing the occluder, a pressure test is required to check the installation quality of the occluder.

(1) After the plugging device is installed, the working air or inert gas should be filled with the pipeline until the pressure meets the design requirements.

(2) Check after the pressure is maintained for a period of time to ensure the stable installation of the stopper, and measure the pressure difference between the inside and outside of the pipeline.

(3) For one-way plugging, it is necessary to check the plugging effect of the plugging device to ensure normal flow.

(4) For two-way plugging, it is necessary to check the symmetry of the plugging device to ensure that the diameter and pressure on both sides are uniform.

4. Perform operations

After installing the occluder and passing the pressure test, you can modify, replace, or install the occluder. When performing operations, exercise caution and ensure safety to prevent the failure of the occluder caused by misoperations or improper tool operations.

5. Remove the occluder

After the operation is complete, remove the stopper and restore the pipe to normal use.

(1) Before disassembling the occluder, reduce the pressure in the pipeline and check the stable state of the pipeline before disassembling.

(2) Gradually deflate the occluder until it is completely discharged.

(3) Disassemble the occluder and carry out cleaning and other processing for next use.

Third, with pressure sealing precautions

1. Select an appropriate occluder

When selecting a stopper, it is necessary to consider the material of the pipeline, the fluid medium, the use of pressure, temperature and pipe diameter and other factors, the selection of an inappropriate stopper may cause the sealing is not tight or the stopper failure.

2. Reasonable construction

Plugging with pressure is a highly technical operation that requires the selection of the right construction team and strict operational planning to achieve accurate, fast and effective plugging operations to ensure the smooth, quality and schedule of the project.

3. Be safe

Sealing with pressure is a risky operation, and operators need to have the technical ability and stability awareness to ensure the stability of the project and avoid accidents.

Conclusion:

Pressure sealing technology is an important operation technology for pipeline repair, replacement or installation, and its operation process needs to be strictly controlled according to technical specifications and actual conditions to ensure the safety, quality and progress of the project. It is necessary to select the appropriate occluder, reasonable construction and pay attention to the stability points to ensure the effectiveness of the occluder and the success of the construction.

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