When you install a pipe liner, you have a few options. You can use a drag-in pipe lining method, a heat-cured pipe lining method, or a patch lining method. There are pros and cons to each method. You should do your research before choosing an option.
Drag in pipe liner installation method
In the UK, water companies are focusing on reducing leakage, and so are looking to adopt more effective pipe lining methods. While the current non-structural Class D liners aren’t ideal for this purpose, the semi-structural Class C and B liners are a more promising choice. Research on the subject has been comprehensively published by Shannon & Azoor. The document, entitled “Spray Liner 2020”, outlines historical studies and potential tests.
The UK’s water companies face many challenges, including competing resource and investment needs. This can make it difficult to dedicate the attention and resources necessary to make pipe lining a success. The water industry has been successful in the past largely because the workload was predictable and could attract investment from the supply chain. However, it has become increasingly difficult to implement large-scale relining programmes, so there is an urgent need for lining solutions that can provide long-term benefits.
Pipe lining technology has been advancing at a rapid pace, with improvements being made all the time. While this technology is relatively new to the UK, it is well established in Europe. UK WASCs are clearly interested in adopting it, but Reg 31 is holding the industry back. Reg 31 is an incompatible barrier to adoption, as it refuses to recognize robust European Standards.
A good technique for pipe lining is based on a continuous insertion process. The insertion process can be done at speeds up to 5 metres per minute. The faster the insertion takes, the more likely the pipe liner will contract and become fixed in the host. Therefore, it is important to ensure that the process is continuous.
Heat cured pipe lining method
A heat cured pipe lining method uses an ultraviolet light source to cure the liner. The UV light source is drawn through the liner so that it cures emission-free between the sealed ends. This method uses a heat-resistant material such as a polyethylene film to prevent cracking and leaks in a pipeline.
This method requires little site footprint and is ideal for small diameter pipes. Some variants of this method use an epoxy resin mix that expands to accommodate bends and alter the diameter of the host pipe. The lining process can be completed quickly, enabling multiple installations to be completed in a single day. On the other hand, steam or hot water-cured pipe lining methods are factory-prepared and transported to the site in refrigerated lorries.
The heat cured pipe lining method is typically used for larger jobs. One recent project by RSM involved a 1300mm diameter liner. This method has some disadvantages, however, including the need for a hot water supply and tankers. If a pipe has a high level of corrosion, it may be a good choice to install a new liner.
Another method used for pipe lining is known as ambient cure. The method uses a UV light to cure the material. This technology has been widely used for lining pipes using fiberglass liners, but is relatively new to the United States market. To apply a liner, a UV light train is inserted into the pipe line and pushed back out. The speed of the light train varies depending on the diameter of the pipe. The UV light train is also monitored to determine how well the liner is curing.
Patch lining method
Patch lining is a method of pipe liner installation which is used to repair defects in drainage systems and sewers. This method is ideal for small defects that affect a short section of pipework. These patches are designed to be durable and stick to the original pipe.
The patch lining method can be used in both domestic and industrial settings. The process is fast and inexpensive. It involves installing a sleeve of glass-fibre reinforced matting impregnated with silicate resin in a pipeline. Once inflated, the patch liner bonds to the existing pipe-work and restores structural stability. The process is approved by most UK water and sewerage companies.
CIPP lining can be installed in a wide range of pipes, including lateral pipes, sewers, and sewer mains. The process is also known as no-dig lining. While excavation may be required to reach the liner installation point, this process is a popular choice for permanent structural repairs.
Another advantage of the patch lining method is the ability to apply it around bends without it wrinkling. This method is also a good choice for those wishing to repair localised damage. A patch liner is a small, impregnated material placed on an inflatable bladder. It is guided into place by CCTV cameras and inflated to press the patch into place.
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