Pipeline Pressure-Resistant Opening Technology: An Efficient and Safe Solution for Pipeline Maintenance and ReconstructionIn the field of pipeline maintenance, the pressure-bearing opening technology, with its unique advantages, is quietly transforming the traditional operation mode. In fields where oil, chemical, and gas pipelines must operate continuously, traditional maintenance and renovation methods often require shutdown, pressure relief, and emptying of the pipelines. This not only leads to significant economic losses but also may affect the supply to downstream users. Is there a technology that can complete pipeline renovations, repairs, and branch-line connections without interrupting the pipeline flow or allowing the medium to leak? The technology of opening holes under pressure on pipelines is an innovative solution to this problem. It processes circular holes on operating pipelines through mechanical cutting in a sealed state, achieving a new mode of pipeline operation that is safe, efficient and environmentally friendly. 01 Technical Principles and Core Advantages Pipeline pressure-bearing hole-making technology refers to a kind of operation technique that, under a sealed condition, uses mechanical cutting to process circular holes on operating pipelines. When an in-service pipeline needs to be equipped with a branch pipe, the pipeline pressure-bearing hole-making technology can be adopted to complete the task. The basic principle of this technology is to perform double sealing and double blocking at both ends of the pipe section that requires various construction operations on the pipeline in a pressurized transportation operation. Use the opening sealing equipment to cut off the flow of the medium in this pipe section. Utilize the temporary bypass connections set up on the opening sealing equipment at both ends of the pipe section to connect the two ends of the construction operation pipeline. Let the medium in the pipeline continue to be transported continuously through the temporary bypass. In this way, the entire pipeline can continue to operate normally during the construction process. Compared with traditional construction methods, the pressure-controlled hole-making technology has significant advantages: The traditional method requires cutting off the pipeline process, conducting operations such as depressurization, purging, and cleaning, and then using methods like welding, sawing, and drilling to make holes. Although it is mature, it has high risks and requires equipment shutdown and production halt, resulting in significant economic losses due to venting. The pressure-bearing hole-making technology is carried out within a completely sealed cavity. During the cutting process, the tool is isolated from the air, eliminating the possibility of fire or explosion. It also causes no pollution to the environment and is applicable to any medium other than oxygen and various types of pipes of different diameters. 02 Detailed Operational Procedure Analysis Pressure-holding hole opening operations are a precise and systematic engineering task, and must be carried out strictly in accordance with the operating procedures. The following are the basic operation procedures: First, open the gate valve to the maximum diameter. Rotate the handwheel clockwise to advance the drill bit. When the center drill (drill bit) reaches the main pipeline, reverse the handwheel by half a turn (to prevent damaging the drill bit). Start the motor, slowly rotate the handwheel clockwise to advance the drill bit. When you feel that the drill has penetrated the pipe wall, cut off the power supply. After cutting off the power supply, the tool can be manually advanced, which indicates that the drill has penetrated through. Next, rotate the handwheel clockwise to advance the tool. When the bucket knife reaches the pipe wall, reverse it by half a turn (to prevent the knife from getting stuck). Then start the motor and rotate the handwheel clockwise slowly to advance the tool. When you feel that the bucket knife has cut through the pipe wall, turn off the power. After the motor is disconnected from the power supply, the handwheel can be turned to advance the cutting tool, indicating that the hole-cutting process is complete. In terms of the opening method, the following steps are usually involved: conducting welding operations on the pipe fittings; installing the valve; installing the opening machine and opening the valve; performing the opening operation; after the opening is completed, closing the valve and removing the opening machine. Throughout the entire process, the key lies in the use of mechanical seals and the principle of pressure balance. First, using the sealing device on the opening machine, a local sealing space is created on the pipe surface, separating the area to be drilled from the other parts. Then, through the pressure balancing device, the pressure in the sealed space is made the same as that in the pipeline, so that the medium will not leak out. 03 Widespread Application Domains and Adaptability The pressure-bearing hole opening technology has been widely applied in many industries and scenarios due to its unique advantages: This technology is applicable to pipeline operations for various media such as crude oil, natural gas, water, and gas. Specifically, it involves pipelines for the transportation of various substances including refined oil, natural gas, gas, ethylene, aviation kerosene, etc., which do not contain strongly corrosive gases or liquids. In terms of application for pipes, this technology can be used for steel pipes with diameters ranging from φ22 to φ2000, cast pipes, ductile iron pipes, PE/PVC pipes, and other materials. The opening diameter range is from DN20 to DN2000, covering almost all common pipe sizes. In terms of environmental adaptability, the pressure-bearing opening technology can operate within a pipeline medium temperature range of -70℃ to +350℃, and the applicable pressure range for the pipeline operation is -0.3MPa to 10MPa, demonstrating wide adaptability. The main application scenarios include: pipeline maintenance, replacement of corroded sections, installation of devices, pipeline diversion renovation, embedding of three-way joints for welding on the pipeline, and handling other pipeline faults. Especially in emergency repairs during sudden incidents, this technology can quickly carry out pressure-resistant emergency repairs, preventing the situation from worsening. 04 Risk Identification and Safety Control Although the pressure-bearing hole-making technology has many advantages, as an operation method for in-service pipelines, it also has certain risks that require comprehensive identification and control: In terms of safety risks, the main ones include explosion and fire: When making holes in a pressurized pipeline, if the operation is improper or the construction conditions are unstable, it may lead to pipeline leakage or explosion. If the leaked medium is flammable or explosive, it may also cause a fire accident. At the same time, the risk of personal injury cannot be ignored: during the drilling process, if the equipment malfunctions or there is an operational error, it is possible for the operators to get injured. When working at heights, there is also the risk of falling. The construction risks mainly include: improper selection of the opening position, which may restrict the flexibility and convenience of the construction;