CIPP — Cured In Place Piping
When it comes to repairing underground pipes, several methods may be employed. The oldest, and least desirable method is digging. It involves excavating the land surrounding the pipe, and manually fixing or substituting it. It is an extremely costly, difficult, and sloppy way to get the job done. Trenchless pipe reparation, does not involve any digging. It is a much cleaner, cheaper, and easier way. There are several different methods of trenchless pipe repair.
Types of Trenchless Pipe Rehabilitation
Pipe Bursting – This method involves breaking the pipe from the inside. By doing this, it forces the fragments to the outside, allowing a new pipe to be inserted as a replacement.
Mechanical Spot Repair — Spot reparation involves applying corrections on flawed areas. These fixes will give the pipe some improved stability.
Slip Lining — This method is used in fixing leaks or renewing the stability of old or damaged pipelines. It involves placing a smaller carrier pipe into a bigger host pipe. The carrier pipe is usually made out of PVC (polyvinyl chloride), fiberglass reinforced pipe, or polyethylene. Grout is then applied in the space between the old and new pipes, effectively sealing them. Slip lining can be done in pieces, or entire pipelines.
CIPP – Cured in place pipe (CIPP) is by far the most effective method of trenchless pipe repair. It is jointless, seamless, and is a pipe within a pipe. CIPP is capable of fixing pipes ranging in diameter from 0.1–2.8 meters, or (4″–110″).
The CIPP Process
The first step involves the insertion of a resin saturated, stretchable sewer epoxy lining into an existing pipe. The epoxy sewer liner is in the shape of a long bendable tube. The liner is made of polyester, and the epoxy is made up of a base and a catalyst. Once the two are mixed, the epoxy is activated, and then the liner is inserted. The liner must be put inside the pipe within four hours of its manufacture. After that time, the curing process will be rendered ineffective, and the method will not work. This means the liner must be made, transported, and inserted all within four hours. This is the biggest drawback of the CIPP process.
Once inserted, hot air pressure is pumped into the tube. Hot water pressure may also be used. Due to the pressure, the epoxy liner will cure, sealing it against the inner wall of the existing pipe. The original pipe should be free of any dirt, roots, rocks etc before the liner is sealed. If not, they will be stuck inside the pipe for its lifetime. The old pipe will now have a new and improved liner. It will have to be inspected with remote controlled cameras to ensure a positive result.
Benefits of CIPP
CIPP requires little to no actual digging. Some excavation may be necessary, but entry to the pipeline is usually gained through a manhole. There is no destruction of land, or other structures on the property. In some cases, robots may actually perform this repair work. They drill a hole at a predetermined point in the pipe, and insert the liner. This eliminates the need for manpower, saving both time and money. The finished product is the biggest benefit of CIPP. The new liners have a 50-year lifespan, the same as that of a brand new pipe. The new epoxy liner also reduces friction within the pipe, increasing its flow capacity. CIPP can be employed on all shapes and sizes of pipelines.
The well being of underground pipes is vitally important. We rely on them to carry water, oil, gas, waste, and sometimes even harmful chemicals. Cured in place pipe ensures that the contents of the pipes stay within the pipes.