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Lining Vs Floodgrouting

Lining - Installation Methods and Limitations

Slip lining is one of the oldest methods for trenchless rehabilitation of existing pipelines. Slip lining is used to repair leaks or restore structural stability to an existing pipe. Slip lining is completed by installing a smaller, "carrier pipe" into a larger "host pipe," grouting the annular space between the two pipes, and sealing the ends. Slip lining has been used since the 1940s. The most common material used to slip line an existing pipe is high density polyethylene (HDPE), but fiberglass reinforced pipe (FRP) and PVC are also common. Slip lining can be used to stop infiltration and restore structural integrity to an existing pipe. The most common size is 0.20m - 1.5m (8"-60"), but slip lining can occur in any size given appropriate access and a new pipe small or large enough to install.

Installation Methods

There are two methods used to install a slip line: continuous and segmental.

Continuous slip lining uses a long continuous pipe, such as HDPE or fusible PVC, that can be welded into continuous pieces of any length. The continuous carrier pipe is pulled through the existing host pipe starting at an insertion pit and continuing to a receiving pit. Either the insertion pit, the receiving pit, or both can be manholes or other existing access points if the size and material of the new carrier pipe can maneuvered utilizing existing access points.

Segmental slip lining is very similar to continuous slip lining. The difference is primarily based on the pipe material used as the new carrier pipe. When using any bell and spigot pipe such as FRP, PVC, or HDPE the individual pieces of pipe are lowered into place, pushed together, and pushed along the existing pipe corridor.

Using either method the annular space between the two pipes must be grouted. In the case of sanitary sewer lines, the service laterals must be reconnected via excavation.


The new pipe will generally have a significantly reduced cross sectional area because of the size difference between the inside diameter of the existing pipe and the outside diameter of the new pipe, as well as the wall thickness of the new pipe. Sewer laterals must be reconnected via excavation. Installation usually requires excavation at the insertion and receiving pits. Continuous slip lining generally requires bypassing the existing flow. Branches and narrow bends are extremely difficult to repair with this method.

Flood Grouting

Flood Grouting is used to repair leaks or restore structural stability to an existing pipeline. Flood Grouting is completed by blocking the pipe with pipe plugs and flooding it with two different liquids. These repair fluids penetrate even the smallest cracks and holes, which cannot be seen through a camera inspection. Together with the soil around the pipe the two liquids form a sandstone like structure.

Flood Grouting has been used since the late 1980s.The liquids we use in our Flood Grouting Systems are all environmental friendly and made from common additives, which can also beĀ found in the food industry.

Flood Grouting can be used to stop infiltration and restore structural integrity to an existing pipe. It can be used on almost all sizes of pipes. The only limitation is the amount of liquid that can be transported.

One of the biggest advantages of Flood Grouting is that this repair process takes place on the outside of the pipe. As a result the inside diameter of theĀ  pipe is not reduced.

Advantages Of Flood Grouting

Lining Flood Grouting
reduction of inside diameter
seals multiple branches at one time
need to know where the leaks are
seals the manhole in the same step
seals mixed diameter systems in one step
expensive equipment needed
only environmental safe materials used
stabilizes the loose soil around the pipe (caused by infiltration)