Pressure-sealing with continuous flow, this method involves sealing the original pipeline under pressure and using bypass pipelines to install or replace pipeline components without interrupting the flow. The technical process is: weld a tee fitting at the two locations requiring pipeline sealing; bore holes in the pipeline using a boring machine; connect the sealers and other sealing devices to the pipeline and initiate the sealing operation; connect the bypass pipeline to the original pipeline; after the connection is complete, unseal the pipeline and backfill the pipe sections; apply anticorrosive treatment to the tee fittings and use double-sealing conduits to temporarily reroute the operating medium through the bypass pipeline, replacing the severely corroded original pipeline with a new, anticorrosive one; and finally, reroute the operating medium back to the new pipeline. This pressure-sealing with continuous flow technique allows the entire construction process to be conducted without interrupting the pipeline flow.

The continuous conveying pressure-sealing technology for pipelines not only allows for the displacement, replacement, installation, and even addition of branch pipelines under conditions where the pipeline medium is continuously conveyed without interruption, 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 cooling, no pressure reduction, and no production halt, ensuring the smooth operation of process industry transportation. Therefore, it offers high comprehensive benefits and practical value. Although the construction process of this continuous conveying 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 and standards for pipeline modification, and can also significantly mitigate risks.