When it comes to the process of rehabbing a pipeline, slip lining is an efficient, trenchless technology used to help stop leaks or build up the structural stability of the existing pipeline, since this method does not rely on the host pipe’s strength for pressure containment. This method is relatively simple and can be done quickly and easily by a liner expert to ensure proper fit and performance.
The Process of Lining the Pipe
For this process, the liner is slipped into the larger host pipe with the assistance of a winch. It is then secured by grouting the space between the liner and the existing pipe then sealing the ends. This process does not involve liner compression because the slip liner does not rely on the host pipe for pressure containment.
This process helps to stop leaks and provide stability to the host pipe, without having to remove, replace, or abandon the entire damaged or weakened pipeline. By lining the existing pipe, infiltration can be stopped and structural integrity can be restored to the pipe.
High Density Polyethylene (HDPE) is the most common material used for slip liners due to its high strength-to-density ratio. Fiberglass reinforced pipe (FRP), as well as PVC pipe can be used for this process as well. This method can be performed on a wide range of pipe sizes, as long as access to the pipe and the correct pipe size is available for installation. The liner can installed continuously or in segments depending on the application.
Benefits of Slip Lining vs. Abandoning the Pipe
A big benefit of slip lining is that you can avoid the high costs and potential risks, such as pollution or effects on available energy in an area that are involved in abandoning the pipeline. To eliminate the hassle of regulation and laws surrounding pipeline abandonment, lining the pipe to bring it back to exceptional performance is the better option.
This method can also help to eliminate trenching and excavation costs for installing a new pipeline and would also get rid of the risks and cost of having to protect and backfill the pipeline trench since this type of lining is trenchless. Installation of this method is also faster compared to other methods such as compressed fit lining since compression equipment is not needed, reducing pull set up time, and because the process can better handle changes in pipeline ID.