The pipe repair lining method is a trenchless technique used to repair underground pipes without excavating the ground, which enables cost savings, reduced environmental impact, and disruption to public utilities. There are several different techniques for pipe repair lining methods, and some common lining repair methods are listed below:
Traditional lining method (intubation method)： This method involves inserting a new pipe slightly smaller in diameter than the original pipe into the old pipe, and the annular space formed between the new pipe and the old pipe will be filled with grouting material to hold the new pipe in place, creating a so-called "pipe-in-pipe" structure that enhances the strength and corrosion resistance of the pipe.
Stainless steel lining pipe repair method： Stainless steel coils with a thickness of 1mm to 2.5mm are used to make pipes on site according to the inner diameter size of the old pipes. After rounding, welding, cleaning and other processes, stainless steel lined pipes with a length of 100 to 300 meters are made. Before pulling the stainless steel lining pipe into the old pipe, it is necessary to pretreat the old pipe, such as rust removal, cleaning, etc. The exterior of the stainless steel pipe is coated with high temperature resistant unsaturated resin, and then it is pulled into the old pipe by machinery.
Flip liner method： Also known as reverse lining method, this method is to insert a flexible lining pipe impregnated with cured resin into the old pipe from one end, and then flip the lining pipe to attach it to the inner wall of the old pipe. After the resin is cured, a new inner layer is formed, so that the pipe can restore or even improve its original performance.
Ultraviolet curing repair： Utilizing a fiberglass-lined tube that has been penetrated with resin, it is pulled into the pipe to be repaired by professional equipment and then cured using ultraviolet irradiation to create a strong lining layer.
Cured-in-Place Pipe Liner Repair： Similar to UV cure repair, but using hot water or steam as a catalyst to promote resin cure.
HDPE (high density polyethylene) remediation method： The HDPE pipe is hot-melted and shrunk and inserted into the old pipe, which is cooled and restored to its original shape to form a tightly fitted liner.
Spraying method： Use a spray gun to spray the coating material directly onto the inner wall of the pipe to form a protective film.
Hose lining method： Expandable hose material is used, which is expanded by water or air pressure so that it fits closely against the inner wall of the pipe, and when cured, it becomes a new liner.
Spiral wound pipe repair method： A continuous inner liner layer is formed within the pipe using a spiral wound ribbon of material.
Each liner repair technique has its applicable scenarios and advantages, and choosing the appropriate repair method usually depends on the material of the pipe, diameter, extent of damage, and repair budget and time requirements. Trenchless repair technology can not only extend the service life of the pipeline, but also significantly reduce the repair cost and impact on the surrounding environment.