Why did you use both pull-in-place and inversion relining techniques?
When used correctly, different relining methods have unique benefits. This project required us to reline a considerable length of pipe, over 25m, but also required intricate and precise execution due to a series of junctions and level changes. This is why we combined the straight-line power and efficiency of inversion relining, with the high level of control and precision it allows.
Below is a little more about each method, so you can really start to understand what is going on down below.
The Pull-in-Place Method
The pull in place method can be thought of as the most traditional of the relining methods and as such, requires much less equipment to execute than more modern relining methods.
As per the name, it is executed by saturating a tube with EPOXY Resin and pulling it in place, relining the section of the damaged pipe. The nature of the process allows for excellent control and precision in more complex pipelines that may include multiple traps, bends or junctions.
Typically pull-in-place relining requires two access points to the damaged pipeline, enabling the tube to be inserted from one and pulled-in-place from the other. This may be a consideration depending on access and the total length of the pipe to be reined.
Due to its more analogue nature, this method can take a little longer to execute, however, it is very much the preferred method for intricate relining projects and is often used in tandem with other methods.
The Inversion Method
The Inversion Method requires a more substantial investment in specialised equipment than pull-in-place. However, this does not necessarily mean it is more expensive, but that it is utilised in different ways to solve different problems.
As opposed to pulling the new pipe in place, inversion relining utilises an inversion drum to feed the resin-saturated tube into the damaged pipe whilst turning it inside out, therefore inverting it within the structure of the old pipe and restoring its integrity. With enough air capacity, virtually any length of pipe can be relined.
Inversion relining can be conducted from a single opening, simply shooting the new pipe to a stopping point on either side of the damaged pipe. It is also a quicker method of relining, meaning that for long stretches of the regular pipeline, inversion is typically economical and preferred to pull-in-place.
However, when relining more complex pipelines, can cause issues and require extra work meaning more time and potential costs.