Equipment for pressure-opening operations: Industrial art under technical barriers and safety guardiansBeside a running gas pipeline, technicians are concentrating on operating the hole-making machine. The handwheel is turning slowly, and the drill bit is gradually approaching the pipe wall - this seemingly simple action is backed by strict process standards and extremely high professional requirements. In the modern industrial system, pipelines serve as the "blood vessels" for the transmission of energy and resources. The pressure-bearing opening technology, as the core technology in pipeline maintenance and repair, enables the direct opening of connection points on pressurized pipelines without the need for production suspension or medium release. Although the operation steps of this technology seem clear, it involves the deep integration of knowledge from multiple disciplines such as mechanical engineering, materials science, fluid mechanics, and safety regulations. It is by no means a simple skill that can be mastered by just looking at it. 01 Technical Threshold: The Perfect Integration of Precise Equipment and Complex Processes Pressure-bearing hole opening is a highly specialized operation that requires operators to possess a wide range of professional knowledge and skills. According to the "Technical Specification for Pressure Sealing of Steel Pipeline" (GB/T 28055-2023), this technology is applicable to steel oil and gas transportation pipelines and can also be extended to other medium pipelines after risk assessment. Its dedicated equipment is highly complex, including drilling machines, sealing systems, power units and control systems, etc. Taking the large-diameter high-pressure oil and gas pipeline drilling machine as an example, its design needs to incorporate transmission mechanisms, power systems, control mechanisms, and even a specialized pressure balancing system to cope with the large loads exerted on the transmission mechanisms by the internal pressure of the pipeline. The operation process is extremely precise and rigorous. From the initial preparation, installing the equipment, conducting pressure tests and leak checks, to actually making the hole and subsequent processing, every step must strictly follow the regulations. "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)." During the drilling process, one must rely on the sense of touch to determine the penetration status - "When the drill penetrates the pipe wall by hand, cut off the hydraulic supply or power. After cutting off, manual operation can be performed, indicating that the drilling has been completed." Such meticulous operations are far beyond the reach of beginners. 02 Safety Requirements: The Lifeline in High-Risk Environments Pressure-bearing hole opening operations involve numerous risks, especially when dealing with flammable, explosive, and toxic substances. The safety requirements are extremely high. The "SY 6554-2011: Safety Specifications for Pressure-bearing Hole Opening Operations in the Petroleum Industry" provides a clear safety management framework for such operations. Welding safety is of primary importance. In the case of pressure-opening of the aviation kerosene pipeline, welding needs to be carried out under the operating conditions of the pipeline medium. Therefore, "inert gases such as nitrogen or argon must be used for displacement to ensure that there is no possibility of fire or explosion." The process of making holes is also full of challenges. This process is carried out in a "fully enclosed cavity, where the cutting tool is isolated from the air, further reducing the risks". However, for different media and working conditions, additional measures are still required. For instance, the emergence of the module-integrated non-sparking pressure-bearing hole opening technology has made it possible to perform pressure-bearing hole opening in oil and gas explosion-proof areas and non-metallic pipelines, significantly reducing the safety risks of welding operations. The industry standard SY 6554-2011 "Safety Specifications for Pressure-Resistant Opening Operations in the Petroleum Industry" provides detailed regulations on the procedures, hazard assessment, and risk mitigation measures for pressure-resistant opening operations. It requires that adequate preparations must be made before the operation, including on-site investigation, preparation of construction plans, equipment inspection, and personnel training. 03 Application Scope: From routine maintenance to technological breakthroughs in special conditions The application scope of pressure-bearing hole opening technology is extremely broad. It is not only applicable to traditional energy industries such as oil, gas, and chemical industries, but also widely used in urban gas pipelines and various industrial pipelines. In terms of pipe types, this technology can handle various materials such as steel, PE, and PVC, and can accommodate pipe diameters ranging from Ф50mm to Ф1600mm, and even extremely large pipes with a diameter of 3500mm. With technological advancements, nowadays it can also handle large-diameter steel pipes with diameters of DN1016mm and DN1219mm, and achieve a high-pressure working condition with a pressure of 12MPa. Special application environments have also driven technological innovation. In the maintenance projects of deep-sea pipelines, the technologies of pressure-bearing hole opening and temporary sealing were successfully applied to the first deep-sea project in China, establishing the standard construction procedures for deeper water environments. In the maintenance of the gas pipelines of Ansteel, the pressure-bearing hole opening technology reduced the original 56-hour operation time to 5.5 hours, avoiding the shutdown of six production units and significantly enhancing economic benefits. 04 Professional Competence: The Perfect Combination of Experience and Theory To become a qualified pressure-opening technician, one needs to undergo systematic training and extensive practical experience. They must not only understand the principles of the equipment, but also master the characteristics of different materials, the physical and chemical properties of the medium, and the response strategies under various working conditions. The tactile judgment during operation is a typical example of the accumulation of experience. For instance, when approaching the workpiece, "the feeling is that the drill penetrates the pipe wall and then cuts off the hydraulic supply or power source", after cutting off the power, "manual operation can proceed, indicating that the drill has penetrated through" - this kind of judgment ability gained through experience cannot be learned from books. Teamwork is also of vital importance. A professional hole sealing company can clearly state in the construction contract that it assumes 100% of the safety responsibility. This commitment is backed by high-quality equipment and a skilled and standardized operation team. 05 Technological Development: The Evolution from Traditional Techniques to Intelligent Innovation The pressure-bearing hole opening technology is currently in a stage of rapid development. Traditional hole opening machines mainly use hydraulic motors for driving and operate through manual control of hydraulic valves. However, the new type of hole opening machines have added a pressure balance system, which utilizes the pressure of the medium transported by the high-pressure pipe to reduce the load exerted by the pipeline pressure on the transmission mechanism of the hole opening machine. The technology of cutting tools has also made significant progress. For X80 high-strength pipeline steel, researchers specially designed a hole-cutting tool with high-speed steel M48 as the blade material. They optimized the geometry of the tool body and the blade, and used the "three-body one grease" silver brazing method to connect the blade and the tool body according to the metal cutting principle. Intelligence is the future development direction. Based on virtual prototype technology, using 3D modeling software to establish 3D models of the opening machine and opening tool parts, conducting virtual assembly and checking the clearance between them, and performing kinematic and dynamic analyses through simulation software have greatly improved the reliability and efficiency of product design.<span data-v-472c13df="" class="tgt color_text_0" data-section="0" data-sentence="121" data-group="0-121" style="box-sizing: bor