What is the best method for pipeline pressure-sealing?

The choice of pressure-containing pipeline leakage repair methods depends on the specific situation and pressure grade. Below are some commonly used methods for your reference based on your actual conditions:

1. Mechanical Sealing: For medium and low-pressure pipelines, mechanical sealing is applicable. This method primarily uses mechanical strength to seal the leakage area, such as using specialized sealing devices or repair sleeves. Mechanical sealing is suitable for most medium and low-pressure pipelines, but attention must be paid to operational details to ensure no further damage to the pipeline.

2. Welding Sealing: For high-pressure pipelines, welding sealing is a common method. By welding at the leakage point, the pipeline is restored to a sealed state. However, it's important to note that the high temperature of welding may affect the pipeline material, so a thorough inspection and assessment of the leakage area should be conducted before welding sealing.

3. Adhesive Sealing: Adhesive sealing is a commonly used method for low-pressure pipeline leakage. It involves sealing the leakage area using rapid-setting adhesives or epoxy resins, etc. This method is suitable for small leakage points but care must be taken, as incompatibility with the pipeline material may cause further damage.

4. Gel Injection Sealing: Gel injection sealing is a new pipeline leakage repair method, which mainly involves injecting high polymer materials into the leakage area to rapidly solidify and achieve a sealing effect. This method is suitable for pipelines of various pressure grades, but if the pressure at the leakage area is high, it may require the combination of other sealing methods.

In summary, the selection of pressure-containing pipeline leakage repair methods should be based on the specific situation and pressure grade. If possible, operations should be conducted at lower pressures to ensure safety.