Short Liner
The epros®DrainPacker technique is used in trenchless sewer rehabilitation (“no-dig” applications). It is a sectional repair method for defective sewer pipes.
A renovation packer carrying a wrapped-around resin-wetted fibreglass mat is pushed with the help of air push rods or pulled by means of a rope to the point of repair. The exact position of the point of repair is determined beforehand by TV inspection.
When the epros®DrainPacker has reached the correct position, it is gradually inflated by means of compressed air. This causes the packer to expand towards the pipe wall and press the impregnated fibreglass mat in a tight fit against the host pipe with excessive reaction resin penetrating into the damage. This creates a permanent bond between the fibreglass mat and the host pipe wall.
The resin-impregnated fibreglass mat is cured at ambient temperature according to the resin manufacturer’s instructions. The required cure times depend on the climatic conditions in the sewer.
After complete cure of the reaction resin, the packer is deflated and removed from the pipe.
The cured fibreglass mat covers the full area of the repaired pipe section without obstructing the service flow. The resultant pipe-in-pipe system forms an integral unit with the host pipe and fully meets the hydraulic requirements.
Finally, the repaired pipe section is inspected and documented with a CCTV camera. The leakage test shall be performed according to EN 1610.
Alternatively, it is possible to insert stainless steel shells to obstruct larger holes in the host pipe or to close lateral junctions. The stainless steel shell is then used in combination with a short packer.