Pressure Sealing, Pressure Sealing without Stoppage: This technique involves sealing the existing pipeline under pressure and then, through bypass lines, enabling the installation and replacement of pipeline components without interrupting the flow. The process includes: welding four-way fittings at the locations requiring pipeline sealing; using a hole-making machine to perforate the pipeline; connecting sealers and other sealing devices to the pipeline and initiating the sealing operation; connecting the bypass pipeline to the original pipeline; unsealing the pipeline after connection and backfilling the pipeline sections; applying corrosion protection to the four-way fittings and using double-sealing and diverting to temporarily reroute the operating medium through the bypass line; replacing the severely corroded original pipeline with a new, corrosion-resistant pipeline; and then redirecting the operating medium back to the new pipeline. This pressure sealing without stoppage technology allows the entire construction process to be carried out without interrupting the pipeline flow.

The continuous flow pressure-sealing technology for pipeline components not only allows for the relocation, replacement, installation, and even addition of branch pipelines under conditions where the pipeline medium is continuously transported, but also enables safe and rapid repair in the event of a pipeline leak, promptly restoring normal pipeline operation. This technology boasts features such as no temperature drop, no pressure reduction, and no production halt, ensuring the normal operation of process industry transportation. Therefore, it offers high comprehensive benefits and practical value. While the construction process of this continuous flow pressure-sealing technology can be complex for longer pipelines, with reasonable planning, proper operation, and strict control, it can safely and efficiently meet the timeliness and cost-effectiveness requirements of pipeline modification, and also significantly mitigate risks.