The preparation work before the use of pressure sealing is an important step to ensure smooth operation of the working environment. Below is a detailed list of preparations, including but not limited to the following:

1. Stability preparation:

a. Ensure that all operators have received relevant technical training and have the necessary work experience and skills.

b. Ensure that all operators are wearing appropriate personal protective equipment, such as hats, protective clothing, glasses and gloves.

c. Ensure that the stable area around the work site is demarcated and clear warning signs are set up to avoid accidental entry by other personnel.

d. Check that the required tools and equipment are complete and that they are in good working order.

2. Pipeline inspection:

a. Check the type, specifications, and material of the pipeline to be blocked to ensure that the appropriate plugging device is selected.

b. Check the working pressure and temperature of the pipeline to ensure that the selected plugging device can withstand the corresponding pressure and temperature.

c. Check the inside and outside of the pipeline for obvious damage or water leakage, and repair it first if necessary

3. Preparation of plugging device:

a. Select an appropriate plugging device, such as a plugging ball, plugging plate, or plugging sleeve, according to the pipe specifications and plugging requirements.

b. Check the material and sealing performance of the plugging device to ensure that it meets the requirements of use.

c. Clean and clean the plugging device to ensure that its surface is clean and sterile.

4. Formulation of plugging plan:

a. Based on the characteristics and sealing requirements of the pipeline, formulate a reasonable sealing scheme, including the sealing position, sealing time, and sealing pressure.

b. Determine the sequence for installing and removing the plugging device and the corresponding operations.

c. Formulate emergency plans, including handling methods and rescue measures after plugging failure.

5. Sealing device installation:

a. Install the plugging device into the pipeline according to the plugging scheme, and ensure that the connection between the device and the pipeline is tight and the sealing is reliable.

b. Make necessary support and fixation at the installation position of the plugging device to prevent it from moving or falling off.

6. System inspection:

a. After the plugging device is installed, use appropriate testing equipment to test the pipeline pressure to ensure that the plugging device can withstand the system pressure.

b. Check whether there is leakage or leakage around the plugging device, and adjust and repair it if necessary.

7. Stable confirmation:

a. Ensure that all preparatory work has been completed and complete stable confirmation is carried out.

b. Ensure that all operators clearly understand the procedures and precautions for plugging and are guided and supervised by technical personnel.

The above is a general list of the preparatory work before the use of pressure sealing, the specific preparation work may vary according to the actual situation and requirements. Before the closure operation, it is important to ensure that all preparations have been completed to ensure the smooth progress of the work and the safety of personnel.