AKA: Pipe Lining, Pipe Relining, No-Dig Trenchless Technology, CIPP (Cured In Place Pipe).
Structural Pipe Lining or No-Dig Trenchless Technology in simple terms is a process of creating a pipe within a pipe. A new pipe is formed on the inside of the old one whether it be earthenware, cast iron, copper or PVC. Typically the main sizes for drains being lined are 100mm and 150mm diameters. After lining or relining, the minimal diameter loss is more than compensated by the smooth and joint free internal wall of the liner creating a higher flow rate than when the original pipe was installed many years earlier.
Lining materials come in many diameters and can be installed in varying lengths. Air or water can be used to inflate and cure the liner either by ambient air, heated water or steam.
How Structural Pipe Lining Works:
A felt or woven fabric tube is cut to length and impregnated with a mixture of epoxy or silicon resins. The wetted out liner is then inserted into the defective drain before being inflated and left to cure.
When the liner has cured, the inflation tube used to inflate the line is removed, leaving a smooth joint free liner within the original host pipe.
Structural pipe lining is suitable mainly when excavation is not an option for repairing root damaged, fractured and leaking pipes where there’s been no major movement, damage or collapsing of the pipe work. The majority of liners mould themselves to the shape of the inside of the host pipe, so if a pipe is lined with displaced or misaligned joints this will not be a problem.
As a rule, cost savings associated with pipe lining over traditional trenching methods are usually determined by the degree and value of any existing surface structures above the pipe as pipe lining illuminates the need for most or all surface restoration. If the drain is not excessively deep and the ground surface above the pipe is totally free of any structures such as concrete slabs or drive ways, swimming pools, tennis courts, roads or detailed landscaping or trees then excavation should also be considered. In many cases a combination of pipe lining and excavation can be the most cost effective solution. That means excavating and renewing what you can and relining what you can’t.
Our Range Of Structural Pipe Lining Methods Is Complete
The following pipe lining processes are designed to deal with many different types of drainage issues. The location, length, depth, design, and size or what we call job attributes will influence the selection of the right lining process or processes best suited for a particular circumstance.
Inversion Pipe Lining:
The inversion pipe lining process is best suited for the rehabilitation of longer lengths of pipe work. Very long sections of affected pipe can be lined with one continuous length of structural liner usually from one access point to another or from one access point to a predetermined point downstream in the pipe.
This process involves impregnating a needle fibre felt tube or liner with a mix of epoxy or silicon resins then installing the entire length of liner into a devise called an “Inversion Drum”.
The Inversion Drum is then pressurised with compressed air which forces the liner out through a nozzle simultaneously turning the liner in-side-out (inverting) and shooting it down the pipe.
The liner can be cured by either ambient air or hot water to form a rock hard super smooth lining on the inside of the old host pipe.
Pull-In-Place Pipe Lining:
Pull-In-Place pipe lining is best suited for the sectional lining of pipe work from 1 metre to 20 metres in length with a single repair. Longer lengths can be repaired by simply installing multiple liners which overlap to form one continuous liner.
The advantage of this type of lining is that the prepared liner is pulled into position to exactly where the damaged area is. This means that instead of lining all of the pipe work, which may not be necessary, we can line only the affected section. For example, you may have 60 metres of pipe work however only 3 metres of the pipe is affected right in the middle. In this case we can install a 3 metre liner 30 metres down the line to repair just that section.
Provided existing access into the pipe work is suitable Pull-In-Place pipe lining can be carried out through a standard inspection opening or access point making this process a truly no-dig option.
Localised Spot Repairs
A drain localised spot repair is a small section of liner that targets specific defects such as a root damaged joint or a cracked or fractured section of pipe work.
The super smooth finish of the installed liner more than compensates for the small diameter loss and spot repair liners offer a smooth transition from the host pipe to the liner.
How Spot Repairs Work:
A woven fabric liner is treated with a mix of epoxy or silicon resins before being wrapped around an inflatable packer. The packer is then inserted or pulled into the sewer or storm water line up to the point of the defect.
The packer is then inflated and holds the liner mechanically to the host pipe until the curing process is complete. The packer is then deflated and removed leaving a smooth localised spot repair over the defective joint or fracture.
Ideal for targeting specific defects such as damaged joints, cracks and misaligned pipe work, the spot repair method allows the repair of defects between sewer and storm water pipe junctions and connections without capping them off.
For specific and targeted pipeline repair, DRAINS ‘R’ US® offers the best localised spot repair service.