"Key Paths and Technological Breakthroughs for the Continuous Improvement of Pressure-Resistant Sealing Installation Techniques" Abstract This paper systematically explores the technical routes and implementation methods for the continuous optimization of the pressure-sealing installation process. By analyzing the current process bottlenecks, it proposes a comprehensive improvement strategy covering material innovation, equipment upgrading, and operational standardization. The article elaborates on key technological breakthroughs such as new sealing materials, intelligent sealing equipment, and digital process control, and validates the process improvement effects through actual engineering cases. For different working conditions, it provides differentiated process optimization schemes, providing a systematic solution for enhancing the safety and reliability of the pressure-sealing technology. **Key Words** Pressure-sealing; Installation process; Sealing material; Intelligent equipment; Digital control; Process optimization; Pipeline maintenance ### 1. Current Status and Technological Challenges of Pressure-Resistant Sealing Technology The pressure-sealing technology, as the core process in pipeline maintenance and emergency repair, its installation quality directly affects the safety of operations and the reliability of the system. The current mainstream pressure-sealing methods include three categories: fixture sealing, bladder sealing, and welding sealing. The applicable pressure ranges vary from 0.1 MPa to 10 MPa. However, in practical applications, the failure rate of sealing still remains at a level of 3% to 5%, mainly due to seal failure, poor equipment compatibility, and human operational errors. The specific manifestations of the process bottleneck are as follows: Traditional rubber sealing materials have a shorter lifespan under high-temperature and high-pressure conditions. When used in an environment above 80℃, the aging speed increases by 3-5 times. The matching accuracy between the sealing equipment and the pipeline is insufficient, especially for pipelines with excessive ellipticity, it is difficult to effectively control the sealing gap. There are too many manual operation steps, and the control accuracy of the sealing pressure is usually only ±10%, which is far lower than the ±2% level of the automated system. Statistical data from a gas transmission pipeline show that 60% of the sealing accidents are caused by improper process control. Industry standards have imposed increasingly strict requirements on pressure-sealing operations. The latest version of SY/T 6150-2020 stipulates that the high-pressure sealing system must achieve dual sealing to ensure that the leakage rate after sealing does not exceed 0.01%. These requirements pose severe challenges to traditional techniques and urgently call for systematic innovation to achieve a leap in the level of the process. ### 2. Material Innovation Enhances Sealing Reliability Polymer composite materials represent the main direction of the development of sealing materials. The new polyurethane-ceramic composite sealant can maintain over 90% of its elastic modulus at a temperature of 120℃, and its service life is three times that of conventional rubber. The friction coefficient of graphene-reinforced sealing materials has been reduced to below 0.1, reducing the insertion resistance of the plug by 40%. An application case from an oil field shows that the sealing plug using this material has a service life in sulfur-containing media extended from 3 months to 9 months. The adaptive sealing structure design significantly improves the interface adhesion. The variable stiffness sealing ring based on metal rubber can automatically adjust the contact pressure according to the deformation of the pipeline, controlling the sealing gap of the elliptical pipeline within 0.05mm. The shape memory alloy sealing piece returns to the preset shape at body temperature, achieving a perfect fit with the pipe wall. In a pipeline renovation project, the adaptive sealing increased the sealing success rate from 92% to 99.5%. The nano-coating technology provides additional protection for the sealed surface. The diamond-like carbon (DLC) coating increases the hardness of the sealed surface to above HV2000, and enhances the wear resistance by 5-8 times. The superhydrophobic nano-coating has a contact angle greater than 150°, effectively preventing the penetration of media. Experimental data show that the life of the sealed parts after nano treatment is extended by 300% in the sandy medium. III. Upgrade Process Precision of Intelligent Equipment The electric-hydraulic sealing system achieves precise pressure control. The hydraulic pump station driven by a servo motor has a pressure control accuracy of ±0.2 MPa, with a response time of less than 50 ms. The intelligent pressure compensation system adjusts the sealing pressure ratio in real time to ensure reliable sealing under different working conditions. Application data from a refining and chemical enterprise show that the intelligent system has shortened the sealing operation time by 40% and reduced energy consumption by 25%. Machine vision-assisted positioning has enhanced the installation accuracy. The image recognition system based on deep learning can automatically detect pipeline defects and geometric deviations, with a positioning accuracy of ±0.5mm. The AR-assisted installation system uses projection to guide the operators to precisely adjust the sealing position. In a city gas pipeline network project, visual assistance increased the success rate of the sealing device installation to 98%. The adaptive fixture system has solved the problem of pipe deformation. The intelligent fixture with multiple electric actuators can automatically compensate for the ellipticity of the pipe, and can adapt to a maximum diameter deviation of 5%. The force feedback control system ensures balanced contact pressure at each point, avoiding local overload. Field tests show that the sealing performance of this fixture on deformed pipes is three times better than that of traditional fixtures. ### 4. Digital Process Control System Digital twin technology enables the simulation of the entire process of the manufacturing process. By establishing a three-dimensional virtual model that includes pipeline parameters, medium characteristics, and blocking equipment, the effects of different installation schemes can be simulated in advance.