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The 5 Most used Trenchless Pipe Repair Applications

plumbergranville trenchless pipe

For the past few decades, trenchless pipe repair applications have taken over the pipe restoration industry by storm. It has gained a lot of praise since it showed that pipe repair shouldn’t have to be a very destructive and troublesome utility restoration. Most pipe repair services are using trenchless pipe repair, and some of them even innovated the solutions even further. Trenchless pipe repair isn’t just one standardised process; it’s actually composed of various methods that are applicable depending on the condition of the pipes and the surrounding work site. Listed below is some of the most used trenchless pipe repair applications used today.

Trenchless Pipe Rehabilitation

There are actually two categories that are under trenchless pipe technology and one of which is the pipe rehabilitation. This method emphasises the integration of pipe liners or miniature pipes into the main sewer line to repair the linings while also increasing the structural integrity of the pipes.

  • Sliplining

Sliplining is basically the insertion of a small pipe into the base pipe structure of the sewer system. The small pipes can be modified in order to perfectly fit into the larger pipe. In order for the pipe to be inserted, there must be two pits which serve as the entry and exit points of the sliplining pipe. There are various classifications of pipes that are used to insert in the pipe lining such as high density polyethylene (HDPE), epoxy, PVC, and fibreglass pipes.

  • Cured-in-place pipe

Cured-in-place-pipe (CIPP for short) uses the same principle with sliplining in which a pipe is added to pad the cracks & damage while fortifying the inner lining. In CIPP however, it uses a special resin liner instead of an entire pipeline. This resin liner is soft and placed into the pipeline through the use of a bladder and air/water inversion. A certain amount of time is given to the resin to harden bind itself with the core pipeline. This process can be accelerated with the use of warm water and steam, since high temperature allows the resin to be solidified at a faster rate.

  • Pull-in-place lining

This is actually the same with CIPP as it still uses a resin liner to restore the sewer main line. The only difference between the two is the process in which how the liner is integrated. In CIPP, it only uses one entry point and the inversion process to place the resin liner, while pull-in-place lining requires two access pits to pull the liner in place with the use of winch machinery. Just like CIPP, hot water and steam is used to cure the liner.

Trenchless Pipe Replacement

This is the second type of trenchless pipe repair which is a far more intrusive than the rehabilitation methods due to the necessity of excavation. However, pipe replacement can be a more appropriate solution in situations in which inserting resin liners or pipes are not applicable.

  • Pipe bursting

As its name would suggest, this method is done by destroying or bursting the existing pipeline. The process can be done by using a bursting head machinery to rupture the old pipeline while also pulling the new pipes in place. Pipe bursting is mostly used in conditions which the pipes are already too damaged & can’t be repaired by pipe rehabilitation.

  • Moling

Dredging or moling equipment is used to dig a pathway for the new pipe. The digging equipment is usually a steel cylinder which uses pulsed compressed air to smash the soil in front of the machinery. This method is probably the most destructive among the other trenchless methods mentioned in the article. However, its damage to the landscape is actually 90% less compared to traditional open-cut pipe repair excavations.