How is a Sliplining Process Done?
Trenchless pipe rehabilitation solutions have a knack of repairing broken pipes without causing too much damage on the work site. A lot of people are familiar with cured-in-place-pipe (CIPP) but have trouble identifying sliplining. Actually, sliplining is basically the same with CIPP. The only difference between the two is the material used. CIPP applies epoxy resin liners into the sewer line to repair and strengthen the pipeline. On the other hand, sliplining uses an actual pipe with its procedure.. We’re going to take at a brief but descriptive look at the sliplining process.
- Surveying the pipe connection
The contractors don’t immediately use sliplining for repairing pipes. They must first see the actual condition of the pipelining. Inspections help the contractors come up with the best solution. Sometimes, there are pipes that can’t be restored due to damage and age. These pipes need to be replaced with new and better materials which make pipe rehabilitations methods inapplicable. Aside from the pipe’s condition, the repair crew must also check clogs and potential obstructions.
- Removing the obstructions
Repair contractors must remove any form of obstructions in the sewer line. Leaving clogs in the pipes will make it difficult for the pipe liner to move around the sewer system. Common objects in the pipeline include roots, grime, dirt, debris, or even a broken pipe.
A water jet is a popular tool for blasting out clog-forming items. Sometimes contractors don’t use water jets since it can further crumble a fragile pipeline. Mechanical augers are another alternative for clearing blockage. Contractors sometimes need to excavate a section of the pipeline since it’s already collapsed.
- Creating an access pit
The next procedure is to create an access pit. The access pit will serve as the entry point of the pipe liner. This part of the process requires a bit of excavation but it’s just minor dredging. It’s extremely rare to have a manhole or pre-built entry point that will suffice for the new pipes. The size of the access pit will depend on many factors. It could be the soil conditions or currently available tools. Of course, the pit must be larger than the new pipe to avoid abrasions during the insertion.
- Installing the pipe
Inserting the polyethylene liner can be done in many ways. Popular methods include pulling or pushing the pipe liner. In some instances, the pipe is integrated through the combination of pulling and pushing. In most cases, the type of insertion method will depend on how the pipe liner was fused. Pre-fused polyethylene pipes can be either pulled or pushed into the liner. Gasket-jointed pipes can only be placed with the use of the pushing technique.
- Final connections
The sliplining process doesn’t end with the insertion of the pipes. There are still some final connections and tests done. This will make sure the new pipes are properly fitted and don’t have any problems. Reconnections and further check-ups can be done 24 hours after inserting the liner.