Basically there are two different techniques
Relining is a collective name of different methods for the interior renovation of pipes. There are several different techniques / methods, but the common ground is that there are fewer interventions in the property, less impact for residents and a shorter renovation time.
There are mainly two different techniques for renovating pipe relining in buildings – with flexible liner as Sacpipe Connection System or coating with thermosetting plastics.
- Renovating with flexible liner creates a new self-supporting pipe system using compressed air technology and the liner is cured under pressure inside the old pipe. It installs simply a new pipe with the old pipe as a casting mold. When the new pipe is cured, it is no longer dependent on the old pipe.
- When using coating as renovation method. A polyseter plastic is sprayed or epoxy is brushed out and will then cure inside the pipes. The durability of the old pipes is improved with an internal coating / wear surface.
There are three factors that determine that it will be a good result – the choice of systems, materials and installers.
Some tips for you who are about to renovate your pipes with relining:
- Do your homework first! Read about the system and material. Ask for references and samples so that you can learn mor and compare the material with a new PP pipe.
- Some installers in Sweden are members of BRiF, the association of relining in properties. It involves an annual inspection by SP, the Swedish Technical Research Institute. Which does not guarantee the result but they have everything in order at the company, like documentation and more.
- Use an installer that is trained on the system they install. Ask to see the certificate for the relevant training.
- Prefabricated branch pipes will be installed. Make sure this is included in the inquiry.
- Installation documentation and operating / maintenance instructions should always be provided to the client. To ensure the results you can hire an independent inspector who inspects the exposed parts such as branch pipes and bends.
- Make sure to do a detailed feasibility study of the project to ensure that an inquiry is complete so that you minimize any additional work and extra costs.
- Are you missing knowledge, you should enlist the help of an independent consultant. (There are no independent sellers …)
Relining with two different techniques, coating to the left and relining with flexible liner to the right.
Short on coating techniques:
- A craftsmanship. It is very important that there is a skilled craftsman / installer.
- The pipes must be clean and dry before installation can be performed.
- Varying wall thickness. You can never know what thickness you gets, it will be irregular, sometimes thick and sometimes thin.
- Do not repair larger holes and cracks. It is not possible to seal a hole by “painting”.
- Difficult to cover properly in the branches and bends.
- Fast installation.
Short on flexible liner techniques:
(Sacpipe Connection System)
- Prefabricated pipe system that must be installed by trained installers.
- Different liner has different properties. It must be very flexible.
- A flexible liner is a requirement for bends and dimensional changes
- Always provide predefined thickness.
- Prefabricated branch pipes should always be installed for a seamless pipe systems. The branches must be strengthened.