What makes the quality of pressure-bearing pipe opening excellent? Three guarantees: precision, safety and efficiency. In modern pipeline maintenance, repair and renovation projects, the pressure-bearing pipe opening technology has become an indispensable core process. It enables the machining of precise circular holes on operating pipelines through mechanical cutting methods while keeping the pipeline under normal operating pressure and ensuring the continuous flow of the medium. This technology, known as "pipeline minimally invasive surgery", has its quality advantages in multiple aspects such as process advancement, precision control, safety guarantee, sealing performance, and economic benefits. This article will comprehensively analyze the quality advantages of this technology from multiple dimensions including process advancement, precision control, safety guarantee, sealing performance, and economic benefits. 1. Advanced Technology: Transforming the traditional operation mode The primary quality advantage of the pressure-opening technology lies in its complete transformation of the traditional pipeline construction mode. The traditional pipeline opening operation requires closing the valves and purging the medium in the pipeline, which is not only time-consuming and labor-intensive but also leads to long-term pipeline shutdowns, seriously affecting residents' lives and enterprise production. However, the pressure-opening technology uses mechanical cutting methods and conducts flameless cutting in a sealed state, achieving "no pipeline shutdown, no production stop" for the construction operation. The core manifestation of the advanced nature of this technology is: while the pipeline is maintaining normal transportation, new pipeline connections or equipment installations can be completed. As stated in the technical summary of Shougang Construction Group, this technology does not affect normal production, can effectively maintain the pressure stability of the original pipeline, and has a relatively small impact on the environment around the opened holes and sealed pipes. In the water supply pipeline renovation practice of Liaocheng Water Supply Group, the opening operation that required 2 hours to complete using the traditional method could be completed with high quality in just 1 hour after using the pressure-bearing opening device. The operation efficiency was directly increased by 50%, and the water outage time was significantly reduced from 2 hours in the traditional operation to 5-10 minutes at the moment of opening, truly achieving the construction goal of "almost no water outage". II. Precision Control: Precise dimensions, smooth cuts The quality advantage of pressure-assisted hole opening is most directly reflected in the high controllability of the hole opening accuracy. Modern pressure-assisted hole opening equipment adopts a precise mechanical transmission system, featuring high output torque, wide speed adjustment range, stable operation and reliability. In the high-difficulty pressure-assisted hole opening operations in the Shunbei Oilfield of the Northwest Oilfield, special alloy drill bits enter the pipe wall at a slow speed of 10 revolutions per minute. The monitoring screen displays the key parameters such as pressure and temperature in real time, ensuring the precise and controllable process of hole opening. According to the technical specification "Key Points for Quality Control of Non-stop Pipeline Construction Projects", during the hole-making operation, the rotational speed and feed rate need to be comprehensively judged based on the equipment operation procedures and the cutting sound to ensure that they are matched, thereby guaranteeing the quality of the hole-making. After the hole-making is completed, the saddle plate must be checked immediately to see if it has been removed, and then the wear conditions of the center drill, the cylinder cutter, and the flatness of the cutting surface of the saddle plate should be inspected to infer whether the hole-making process was smooth and the condition of the pipeline cutting surface. This full-process quality control ensures that the edge of the hole-making is smooth, without burrs or cracks, laying a solid foundation for the subsequent sealing or connection operations. The large-diameter pipeline horizontal pressure-bearing opening technology fully mastered by Daqing Oilfield Storage, Transportation and Sales Branch can open pipelines with diameters of less than 720 millimeters. This has completely solved the problem of difficult large-hole opening with domestic equipment and ensured the smooth and reliable operation. This large-diameter and high-precision opening capability is a quality advantage that traditional opening methods cannot match. III. Safety Assurance: Sealed mechanical cutting to eliminate the risk of explosion For pipelines transporting flammable and explosive media such as oil and natural gas, safety assurance is the primary connotation of quality. The pressure-bearing opening technology employs a flameless, sealed mechanical cutting method, fundamentally eliminating the potential risk of explosion that may be caused by traditional hot welding. The realization of this safety advantage relies on a strict multi-layered security system. According to professional construction standards, before opening the holes, the installed hole-opening equipment must undergo a tightness test. All valves and connectors need to undergo a tightness test to check their sealing performance. The flange valve, as the only valve that separates the internal medium of the pipe from the external environment, its sealing effect directly affects the safety of the operation. Before disassembling and assembling the opening manifold, nitrogen displacement and pressure equalization must be checked to ensure that the operation process is safe and controllable. In the application of the Asai Line project, the pressure-bearing perforation technology has been proven to be safe, reliable and pollution-free. It does not affect the normal transportation of the pipeline and can ensure the completion of the connection between the old and new pipelines in a safe, efficient and environmentally friendly manner. The application practice of the gathering and transportation pipelines in Nanbu Oilfield also indicates that the pressure-bearing non-stop pipeline sealing technology is beneficial to environmental protection and stable production capacity, and has the advantages of high operational safety and good economic performance, providing a strong guarantee for the safe operation of the gathering and transportation pipelines. IV. Sealing Performance: Leakage rate reduced to micro-level The quality of pressure-bearing hole opening depends ultimately on the sealing performance of the pipeline after the opening. In recent years, with technological advancements, the sealing performance of pressure-bearing hole opening equipment has achieved a qualitative leap. The "New Type DN100 Sealed Pressure-Resistant Opening Valve" developed by the QC Team of Dongyou Tuoxin of Northeast Pipeline Company adopts a double-layer hard sealing structure, successfully resolving the common problem of insufficient sealing performance of pressure-resistant opening valves in high-pressure and complex working conditions. Through technological innovation, the leakage rate has been reduced from greater than 0.01% to 0.008%, reaching the high-sealing standard of the 10,000th level. This extremely low leakage rate means that the pipeline system after the opening can operate stably for a long time without being affected by leakage at the opening point and without posing safety risks. During the construction process, the guarantee of sealing performance is ensured throughout every step. After the three-way welding is completed, each three-way needs to be grounded during the entire opening and sealing process to prevent the accumulation of static electricity. When removing the plug handle after the opening is completed, it is necessary to ensure stable pressure to prevent unstable pressure from causing the plug handle to shift and fail to be effectively locked, thus failing to achieve the sealing effect. After the plug handle is locked, the header should be removed, and all parties involved in the construction should confirm the sealing effect. Then, the blind flange should be installed. After installation, a leak test should be conducted again. This multi-level quality control ensures the reliability of the sealing at the opening. V. Whole-process Quality Control: Precise Management from Survey to Restoration The quality advantages of pressure-bearing hole opening are also reflected in the entire quality control system throughout the process. According to professional literature, the quality control of in-service pipeline non-stop construction projects runs through the entire process and requires meticulous planning by the construction unit. Each process should be regarded as a key process for control. The key points for pre-job control include: conducting on-site survey to confirm the pipeline's direction, burial depth, and height difference; confirming that the straight weld seam position should not be located directly above the pipeline to avoid affecting the hole-making operation; setting up a partition wall between the fire operation pit and the sealing pit according to the specification requirements to ensure that the fire operation is carried out in a relatively independent space; conducting strict inspections of the equipment. The key points of process control for the operation include: for the three-way welding, strictly follow the standards to position and install the joints at the specified intervals, conduct layered inspections and 24-hour delayed inspections, and if necessary, perform delayed crack inspections after 48 hours; during the hole-making operation, check whether the center drill and the cylinder cutter are installed perpendicularly to the pipeline centerline; during the sealing process, pay attention to the impact of changes in pipeline operating pressure on the sealing effect.