Patch or spot repair as it is sometimes known, involves the repair of an isolated defect within a sewer pipe. The repair is commonly made by positioning a short sleeve of resin impregnated material within the pipe and curing using ambient techniques.
At RSM we utilise a glass fibre system coupled with a PU silicate resin system that is cured at ambient temperature. The glass fibre is impregnated with resin and folded onto an inflatable packer. The packer complete with patch is then inserted into the existing pipework, located to cover the pre-measured defect, and inflated to form a leaktight repair to the existing system.
Our system utilises the Fernco Pipe Doctor product which is the only WRc approved patching product in the market place at the present time.
The combination of silicate resin and electro-chemically-resistant glass fibre provides excellent mechanical properties once installed.
The system is available with a variety of curing schedules to suit the ambient temperature, and can be accelerated to suit the contractor’s requirements.
We also supply a specialist radius system for patching around 90° bends, this utilises a muti-axial glass fibre with excellent expansion qualities and a specially designed packer to form a perfect wrinkle-free repair around 90° bends in 100mm to 200mm pipework.
Our mid-length repair system utilises a specially formulated rubber bladder that is suitable for use in 100mm and 150mm pipework.
The bladder is made up using high end machined parts, coupled with a layflat rubber tube that is inflated once into position.
The bladder system is particularly useful for lining from difficult access points, such as gully pots and is particularly useful as it allows the contractor to line only the section that requires remedial work rather than having to install a full length CIPP liner.
The system is suitable for lining around 45° and 90° bends using our proflex and superflex liners and can be used with both our ambient cure, silicate and epoxy resins.
Once the bladder is prepared and cut to length the needle felt tube is pulled over the protective sleeve, impregnated with thermosetting resin and installed into the pipework. Once in the correct position, the bladder is inflated and the liner left to cure filling any voids, covering any cracks and ` defects that were present prior to the repair.
Once cured the inner bladder is then removed, and you are left with a permanent structural repair.