Pressure plugging is a common nozzle method used for repair, replacement, or installation of equipment at pipe joints. It is characterized by the fact that the pipeline is in a state of pressure during the construction process, so special techniques and tools are required to ensure the effectiveness of construction. The following describes the nozzle method with pressure closure in detail.

1. Preliminary preparation

Before performing a takeover operation with a pressure plug, adequate preparatory work is required. First, the pipeline needs to be inspected and evaluated to determine the location and scope of the takeover. At the same time, it is necessary to formulate construction plans and stability measures, including ensuring good ventilation in the working area, preventing fire sources, and setting up isolation areas. In addition, it is necessary to prepare the required tools and materials, such as spreader, stopper, support frame, safety belt, etc.

Two, expanding

Flaring is a step with a pressure sealing nozzle to create a wider aperture at the pipe interface to facilitate subsequent sealing operations. The main methods of flaring are mechanical flaring and thermal flaring.

Mechanical flaring is operated with a spreader, which is inserted into the pipe and then expanded to the desired size by expansion action. The thermal expansion is heated by flame to soften the pipe and then expand it.

No matter what method is used, it is necessary to ensure the quality and stability of the flaring. During the flaring process, attention should be paid to preventing the occurrence of pipeline deformation and gas leakage, and real-time monitoring should be carried out to ensure that the size and shape of the flaring meet the requirements.

3. Block

After the expansion is completed, the sealing operation can be carried out. The main sealing methods are mechanical sealing and air cushion sealing.

Mechanical plugging The plugging device is used to operate. After inserting the plugging device into the spanner, the plugging device is expanded to the inner wall of the pipeline through air pressure or water pressure to form a sealed state. Air cushion sealing is achieved by inflating the air cushion, and the shape and size of the air cushion can be adjusted according to the shape and size of the pipeline.

Regardless of the method used, it is necessary to ensure the quality and stability of the plug. The plugging operation needs to be monitored throughout the process to ensure that the sealing performance of the plugging device or air cushion meets the requirements to prevent the occurrence of gas leakage.

4. Support

After the closure is complete, support operations are also required to ensure the stability and safety of the pipeline. There are two main supporting methods: support frame and derrick.

The support frame is a shelf that can be fixed above the pipe to reduce the weight and pressure of the pipe while also facilitating subsequent operations. The boom is fixed on the upper support point through the hanger to ensure the stability of the pipeline.

Regardless of the method used, the quality and safety of the support need to be guaranteed. Support operations need to be monitored throughout the process to ensure that the stability and carrying capacity of the support frame or boom meet the requirements to prevent the occurrence of deformation and rupture of the pipeline.

5. Cleaning

After the completion of the takeover operation, it is also necessary to clean the site to ensure the cleanliness of the work site. The main cleaning methods are mechanical cleaning and chemical cleaning.

Mechanical cleaning uses mechanical equipment to operate, such as cleaning machines, vacuum cleaners, etc. Chemical cleaning is the use of chemicals for cleaning, such as cleaning agents. When cleaning, it is necessary to pay attention to prevent the harm of chemicals to the environment and the human body, and at the same time, it is necessary to fully clean and treat the agent.

In short, a sealed nozzle is a risky operation that requires special attention to construction and efficiency. When performing the takeover operation, it is necessary to strictly follow the operating procedures to ensure the quality of each link to ensure the successful completion of the operation.

Get more knowledge about What to Look for When Choosing an hot tapping machine Manufacturer please refer to aoguang sandwich valve：https://www.pipelinehottapping.com