Be present in the rehabilitation of the underground without disrupting the surface activity.
A renovation packer carrying a wrapped-around resin-soaked fibre glass mat is pushed to the point of repair with the help of air push rods or pulled by a rope. The exact position of the point of repair is determined beforehand by TV inspection.
When the packer has reached the correct position, it is gradually inflated by compressed air. This causes the packer to expand towards the pipe wall and press the impregnated fibre glass mat in a tight fit against the host pipe with excessive reaction resin penetrating into the damage. This creates a permanent bond between the fibre glass mat and the host pipe wall.
The impregnated fibre glass mat is cured at the ambient temperature according to the instructions of the resin’s manufacturer. The required curing times depend on the sewer environmental conditions.
After complete curing of the resins, the packer is deflated and removed from the pipe.
The cured fibre glass mat covers the full area of the repaired pipe section without obstructing the service flow. The resulting pipe-in-pipe system forms an integral unit with the host pipe and fully meets the hydraulic requirements.
Repair of the laterals
An LCR packer carrying a wrapped-around resin-wetted hat profile is pushed to the point of repair with pneumatic push rods or a carriage, or pulled by a rope.
The exact position of the damage is determined beforehand by TV inspection. The special feature of the LCR packer is the calibration hose or carrier tube with an extensible finger corresponding to the angle of the laterals. This finger with the inverted resin-soaked hat profile can be retracted into the packer body and then extended and inverted into the lateral by air pressure.
When properly positioned the packer is inflated with compressed air. The retracted finger is extended towards the lateral junction and forced against the host pipe of the junction in a tight fit.
Excessive reaction resin migrates into the damaged areas. This creates a permanent bond between the fibre glass of the hat profile and the host pipe. The hat profile seals the interface between the two pipe systems with its rim only, while the LCR liner in the main pipe is designed as a short liner.
The impregnated LCR liners or hat profiles are cured to the ambient temperature according to the resin manufacturer’s instructions. The required curing times depend on the sewer environmental conditions.
After curing, the packer is deflated, the finger retracted and the packer removed from the pipe.