Sealing with pressure is a common pipeline maintenance method, which is widely used in urban water supply and drainage network, gas network, industrial pipeline and other fields. In the process of pipeline operation, due to various reasons, there will be water leakage, leakage, rupture and other situations in the pipeline, and it is necessary to repair the pipeline. Traditional pipeline maintenance methods often need to cut the pipeline, repair and then welding, time-consuming and laborious, but the construction with pressure sealing can realize the maintenance without cutting the pipeline, thus greatly shortening the construction period and reducing the cost.

The basic principle of pressure sealing construction is that the pipe wall is pressed open to a certain range with a special pressure inflator inside the pipe, and then the special tape is fixed on the pipe wall being pressed open, so as to achieve the sealing effect. Before construction, the pipeline to be repaired needs to be carefully tested to determine the location and degree of damage, and then the appropriate blocking method is selected for repair. The following details the specific steps of pressure sealing construction.

1. Preparation before construction

1, determine the sealing location: Before the use of pressure sealing construction, it is necessary to conduct detailed detection and investigation of the pipeline to determine the sealing location and situation. Detection methods are generally pressure test, smoke test, infrared detection, etc., according to different circumstances to choose different detection methods.

2, prepare construction materials: prepare a certain number of special tape, inflator, expansion rod, steel pipe and other maintenance tools and materials. Special adhesive tape is one of the key materials for sealing construction, and its quality will affect the maintenance effect.

3, stability preventive measures: Set the necessary stability preventive measures at the construction site, the use of protective gloves, goggles and other personal protective equipment to ensure the stability of construction operations.

2. Start construction

1, Locate the blocked area: according to the test results, determine the location of the blocked area, and then determine the construction plan.

2. Remove the pipe connectors: Remove the pipe connectors at both ends of the blocked area, such as flanges, threads, etc., to facilitate subsequent operations.

3, Put the inflator: gently put the inflator into the pipeline to keep it level.

4. With pressure inflation: Connect the air nozzle of the inflator with the air pump and start to inflate. Select the appropriate inflation pressure according to the pipe diameter and pipe material to avoid excessive expansion or explosion caused by excessive inflation.

5, fixed expansion rod: When the pipeline has expanded to a certain extent, it is necessary to use the expansion rod to fix the inflator to prevent it from moving or falling in the subsequent operation. The length of the extension rod is determined according to the length and diameter of the pipe.

6. Determine the length of the tape: Determine the length of the tape to be used according to the actual situation, paste the tape on the surface of the expanded pipe from one end, and ensure that the tape has enough length to cover all the areas to be blocked.

7. Fixing of sealing tape: After pasting the tape, a special fixing clamp should be used to fix it. The number of clamps and the installation position vary depending on the length of the tape and the material of the pipe.

8, pressure relief: After the tape is fixed, it is necessary to slowly reduce the pressure of the inflator, remove the inflator from the pipeline, and use the gas relief device to completely discharge the gas in the pipeline, and finally install the pipeline connector.

Iii. Acceptance after construction

After the completion of the sealing construction with pressure, certain acceptance work needs to be carried out:

1, communication inspection: After the installation of the pipeline connector, communication inspection is carried out to confirm that the blocked area has been completely blocked.

2, pressure test: in the normal use of the pipeline, pressure test to check whether the sealing effect is intact.

3, maintenance inspection: regular pipeline maintenance and inspection to ensure the stability and reliability of pipeline operation.

In short, pressure sealing construction is a relatively fast, simple and economic pipeline maintenance method, which is widely used in industrial, municipal and other fields. It is necessary to pay special attention to the stability and quality control during the construction process to ensure the maintenance effect.

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