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Slip lining cast iron sewer pipes – 3 types of sewer drain repair explained-By Hugo Forster

Sewer Pipe Slip Lining vs Pipe Bursting vs Pipe Lining?

There are multiple options for slip lining cast iron sewer pipes to prevent excavation under a home or building in order to replace the sewer drains. This article explains what kind of cast iron slip lining are available for sewer pipe repair. It also explains the comparative cost vs excavation. First let’s discuss the oldest technology for sewer pipe replacement. The oldest type all of technology is pipe bursting.

Pipe Bursting Cast Iron Sewer Pipes

Old Fashioned Cast Iron Pipe Bursting Trenchless Repair

Old Fashioned Cast Iron Pipe Bursting Trenchless Repair

Pipe bursting involves digging a deep hole at the end of the pipe in order to pull a very strong cable through the pipe. Then a bursting head, which is a conical metal head, is attached to the cable and at the flat side of the head a new HDPE pipe is attached, and then the head is pulled through the pipe using a very strong winch. As the bursting had travels through the pipe it breaks apart the old pipe and pushes it aside and the new pipe goes in its position. The advantage is that the old pipe diameter is preserved or can be increased. The disadvantage is any pipe connections from incoming pipes will be destroyed and excavation will have to be done to replace those connections. Now let’s discuss the next technology. slip lining.

Slip Lining Cast Iron Sewer Pipes

Slip Lining Cast Iron Sewer Pipe Reduces Diameter

Slip Lining Cast Iron Sewer Pipe Reduces Diameter

With slip lining a new pipe is pulled into the old pipe but the old pipe remains. This will reduce pipe diameter and will also cover up connections that would have to be cut open later. Usually with slip lining there is a space between the old and the new pipe which is called interstitial space. The ends of the pipes are sealed by self hardening epoxy which is injected into the interstitial space to prevent leakage out of the new pipe. This process is not used very much anymore. The most modern technology is called cured in place pipe lining.

Cast Iron Sewer Cured In Place Pipe Lining

Trenchless Sewer Repair

Cast Iron Cured In Place Pipe Lining Lasts 100 Years! Reduces Diameter Only 5%

Cast Iron Cured In Place Pipe Lining Lasts 100 Years! Reduces Diameter Only 5%

This is the most modern technology and is the least disruptive and the least expensive. In essence a long fabric tube which is flexible is saturated with a self hardening epoxy and is then pulled into the cast iron sewer pipe. Where pipe connections exist the lining is pre-cut so that it does not cover up pipe connections. This is the least expensive and least disruptive way of restoring sewer pipes. It can be installed from one access point and usually does not require excavation at a second access point.

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