Pipe pressure maintenance hole plugging can complete pipe replacement, relocation, and valve replacement without interrupting the continuous transport of pipeline media. It also allows for rapid repair of the affected section in case of pipeline leaks.

When performing pressure bollarding during pipeline drilling, what preventive measures should be taken to address sealing construction issues?

1. To prevent equipment leakage, it's necessary to inspect the integrity of the sealing parts on the equipment before making any holes.

2. To prevent the hole cutter from scratching or leaking pipe fittings during pressure-filled hole plugging, align the pipe fittings during welding.

3. To prevent the pipe from being pierced during pressure-bearing hole sealing, ensure accurate sizing during the hole construction.

4. To prevent the gasket from being improperly placed or from having debris on it when tightened against the flange, which can lead to leakage at the sealing area after the center drill passes through. Ensure the gasket is properly positioned and remove any debris from the gasket and flange during installation.