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Steps for making an opening under pressure, technical support for opening holes under pressure: First: Connect the power supply to the pressure hole-making tool, turn on the motor switch, check that the equipment is operating properly; if everything is fine, turn it off. Second: Attach the V-belt-driven pressure hole-making device to the base pipe machine, then adjust the length of the chain and align it with the pins, and tighten the nut at the other end of the chain so that the machine is firmly positioned on the pipe. Third: Confirm the diameter of the hole to be drilled under pressure as specified, and use a suitable hole-drilling tool for working under pressure. Fourth: Move the motor and verify that the hole-making machine is functioning properly, and that hole-making under pressure works as expected once again. Fifth: Pull (press down) the handle of the hole-making tool under pressure to cause it to move downward slowly; as it approaches the pipe, check whether the information regarding the location of the hole being made is accurate ； Conversely, it should be shut down, the position adjusted again, and then restarted. The above are the steps for making an opening under pressure. Operating conditions for opening under pressure: Applicable pipe diameters: Steel pipelines, cast pipes, ductile iron pipes, PE/PVC pipes, etc., with diameters from Ф22 to Ф1600 ； Opening diameter: DN20～DN1600 ； Applicable media: oil, natural gas, water, ethylene, gas, medium-grade oil, aviation fuel, etc.; media without strong corrosivity ； Pipeline medium temperature: -30°C to 350°C ℃ ； Pipeline operating pressure: 0～10MPa. Basic requirements for plugging under pressure: To meet the needs of maintenance work on long-distance pipelines, to standardize safety management during the process of plugging pipelines under pressure, to ensure proper construction procedures, and to guarantee safe operation ； Application of plug devices in the safety management of pressure pipeline construction ； The plug device is primarily used for opening and blocking operations in the continuous transportation of long-distance pipelines. It serves to temporarily block the flow of fluid in specific pipelines that are under pressure. It is suitable for making openings, sealing, and repairing various pipelines without interrupting flow. It can withstand high operating pressures, features a reliable sealing system, has a simple design, is easy to operate, offers a high safety factor, and is highly adaptable to field operations; it is therefore a commonly used device for emergency repairs and major overhauls of long-distance pipelines. Tap operation process: Open the door to its maximum diameter. Rotate the handwheel clockwise to advance the cutting tool; when the center drill (bit) reaches the main pipeline, rotate the handwheel half a turn in the opposite direction to prevent damage to the tool. Start the motor and slowly turn the handwheel in a clockwise direction to feed the tool in; once it feels like the drill has penetrated the pipe wall, cut off the power supply. After the power is turned off, manual feeding is possible – the process of drilling through the pipe has been described above. When making an opening under pressure, turn the handwheel clockwise to feed the tool; once the cutter tip reaches the pipe wall, reverse it by half a turn (to prevent damage to the cutter). Then start the engine and slowly turn the handwheel clockwise for feeding. After cutting with the hand-held tubular cutter or the pipe wall, turn off the power supply. After turning off the power, if the handwheel does not rotate and manual feeding is required, it indicates that the cutting is not complete; the handwheel should be turned half a turn in the opposite direction, the motor restarted, and then feeding should continue slowly. When the motor is powered off, the handwheel can rotate, indicating that the drilling has been completed. The above is the basic knowledge of opening holes under pressure.