Sealing with pressure and sealing without pressure are two kinds of sealing methods commonly used in pipeline engineering. There are some significant differences between them in the operation mode, application scenario and risk during the plugging process. I will explain the differences between the two methods in detail below.

First, with pressure sealing

Sealing with pressure means that when the pipeline is blocked, there is still a certain pressure inside the pipeline. This plugging method is mainly suitable for the following situations:

1. Pipeline maintenance: When the pipeline has water leakage, leakage and other problems, it needs to be repaired. The pressure plug can temporarily stop the operation of the pipeline without the need for a complete shutdown, thus reducing the loss caused by the shutdown.

2. Pressure test: After the construction of the pipeline system is completed, in order to verify whether its pressure performance meets the design requirements, pressure test is needed. The sealing with pressure can simulate the working pressure in actual operation and test the pipeline system.

3. Pipeline cleaning: When cleaning the pipeline, the pressure sealing can prevent the water flow from being too large, causing the dirt inside the pipeline to wash to other parts, so as to ensure the cleaning effect.

The procedures for sealing with pressure are as follows:

1. Preparation: First of all, it is necessary to adjust the pressure of the pipeline to reduce the pressure inside the pipeline to a stable range. Then select the appropriate plugging tools and materials, and clean and prepare the plugging area.

2. Plugging operations: Place the plugging tools or materials in the area to be blocked, and adjust the positions and fastening methods of the plugging tools to ensure solid and reliable plugging.

3. Pressure recovery: After plugging is completed, gradually increase the pressure inside the pipeline until it reaches the working pressure required by the design.

The advantage of a pressure plug is that it can be repaired or tested without complete downtime, saving time and cost. However, plugging with pressure also has some hidden risks. Improper sealing or material failure may lead to leakage at the sealing point or even cause an explosion.

2. No pressure plugging

Plugging without pressure means that when plugging the pipeline, the pressure inside the pipeline is completely released, so that the pipeline is in a zero pressure state. This plugging method is mainly suitable for the following situations:

1. Pipeline maintenance: When the pipeline has serious leakage, damage and other problems, it is necessary to carry out a large range of maintenance. At this time, in order to ensure the safety of the staff and reduce the difficulty of maintenance, it is necessary to completely empty the pipeline and seal it without pressure.

2. Pipe replacement: When the pipe or pipe fittings need to be replaced, it is usually necessary to completely empty the pipe and seal it without pressure to prevent the staff from being affected by the pressure during the replacement process.

The procedure for sealing without pressure is as follows:

1. Pipeline drainage: First of all, the medium inside the pipeline needs to be completely emptied to ensure that the pipeline is in a zero-pressure state.

2. Cleaning preparation: Clean the pipeline to ensure that the sealing area is clean, so as to facilitate the adhesion and fixing of the sealing material.

3. Sealing operation: Place the sealing materials in the area to be blocked, and take corresponding fixing measures to ensure solid and reliable sealing.

The advantage of plugging without pressure is that the operation is relatively simple and the stability risk is low. However, plugging without pressure requires complete shutdown, which may result in production disruption and loss due to shutdown.

In SUMMARY:

Plugging with pressure and plugging without pressure are two common methods of pipeline plugging. Pressure plugging is suitable for maintenance, testing and cleaning scenarios, and can be operated without complete shutdown, but there are certain risks. Plugging without pressure is suitable for replacement and a wide range of maintenance scenarios, relatively simple operation, but requires complete shutdown. When selecting the plugging method, it is necessary to consider the factors such as work requirements, risks and economic benefits according to the specific situation.

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