1. Assemble the hole cutting machine

2. During the assembly process, the concentricity of the base of the opening knife and the pressing opening machine should be checked to meet the opening requirements

3. Measure the initial position of the hole cutting head, and record it at the shaft scale of the pipe hole cutting machine, so as to confirm the cutting tool entry condition and feeding degree.

4. Connect the opening machine with the valve, and the gasket bolt is suitable accurately.

5, after the installation of the hole machine, the overall air tightness test should be carried out. This test is important to check that the entire system is well sealed. During the opening process, the opening machine, valve, sub (saddle tee) or flange surface leakage will cause very serious consequences. The air tightness test process can also be a displacement process, the base and sub of the hole machine and the air in the valve replacement into a safe inert gas.

6. After the air tightness test is qualified, open the vent valve with pressure opening. For draining the gas in the base and sub.

7. After the beginning of the press opening, the feeding operation of the feed assembly must be slow and even.

8. When the center drill drill penetrates the pipe wall, the medium will fill the base, sub and valve. After all the gas in the cavity is released, the vent valve will be closed.

9. As the hole cutter begins to cut the pipe wall, the noise of cutting tool can be heard.

10. Pay attention to the speed of the drilling machine when opening holes to ensure that the speed of the drilling machine is stable.

11. After opening the hole, the cutting noise will be reduced or stopped, the hydraulic pressure of the hydraulic working pump station will also be reduced, and the opening machine and the hydraulic working pump station will be more stable. At the same time, check whether the shaft scale has reached the depth.

12. Complete the opening.

13, in order to confirm whether the completion of the hole, just the tool in use manual into 5-6 circles, if it can enter smoothly, indicating that the hole has been completed, if not, indicating that the hole is not finished, also need to continue to open the hole.

14. Return the cutting tool to the base of the holing machine after the holing is finished.

15. Close the valve completely.

16. Open the vent valve to release the pressure in the cavity of the base and sub. (If the opening is flammable, explosive or toxic, connect a dedicated sealing pressure relief device to the vent valve, and the operator must wear protective clothing.)

17. Remove the hole cutter from the valve.

18. Homework completed.