TECHNICAL DESCRIPTION OF THE CURED IN PLACE PIPE (CIPP) REHABILITATION METHOD CURED WITH HOT WATER

1. MATERIAL
The components of the pipe liner are selected according to PN-EN 13566-4. For hot water cured in place pipes (CIPP), polyester (UP), vinylesther (VE), or epoxy (EP) resins can be used. The carrier is usually polymer fabric (PA, PAN, PET, PP). Depending on the requirements of specific pipe liner manufactures, membranes can be added.
The supplier of the liner for this method is Poliner – company from BLEJKAN Group.

2. EQUIPMENT FOR INSTALLATION OF THE PIPE LINER

  • sewer cleaning equipment (pressure truck);
  • remotely controlled pipeline inspection camera;
  • pipeline calibration device remotely controlled machine for milling inner
    surfaces of the pipeline;
  • heating unit (water boiler);
  • inversion equipment (water tower or inversion drum);
  • water column by-passing unit (pumps, hoses);
  • equipment for putting the pipeline back to operation after the installation.

3. PREPARATION TO INSTALLATION
Assessment of the sewer’s technical condition
Before starting rehabilitation, the pipeline is cleaned using a hydrodynamic sewer cleaning unit mounted on a truck. Then the pipeline is inspected using a remotely controlled camera. The video footage is used for preparing a detailed digital report on the pipeline’s technical condition. The report is a base for classifying the sewer’s technical condition.
Choice of the rehabilitation method
The rehabilitation method depends on the technical condition class and damage degree. In order to select the right CIPP pipe, after the sewer’s technical condition is analyzed, other factors need to be considered: geodetic data, ground water level compared to the base of the pipeline, motor traffic in the area, and other parameters that impact the characteristics of the liner to be used. The designer calculates the thickness of CIPP liner using the Young modulus (E) characterizing the proposed carrier.
Saturation of the pipe liner
The pipe is impregnated with resin under controlled vacuum conditions.
Transport to the site
Resin-saturated pipe liner is delivered to the site in containers or boxes ensuring temperature conditions optimal for the used resin. In case of liners saturated with epoxy resin (EP), there is no need to transport it from the saturation site because the saturation equipment is in direct vicinity of the site.

4. INSTALLATION
After separation of the sewer section, a protective sleeve (preliner) is pulled inside the section.
When the surface of the old sewer is secured, a water column or inversion drum is mounted over the place where the pipe liner will be introduced. The pipe liner is introduced using water inversion method.
Then a heating unit is turned on. It heats water (in closed circuit) inside the pipe liner to the curing temperature.
After installation, ends in extreme manholes are cut off using a milling machine and openings in “blank” connections of the cured pipe liner are cut out.
During the installation the following process parameters have to be recorded: pressure of the fluid fed to the pipe liner during all the installation and curing stages and continuous temperature readings from all the control points during the curing process.

5. INSPECTION
TV Inspection
After the installation and opening house drains, acceptance TV inspection (including VHS or CD recording) is carried out. Inspection report is also prepared.
Tests
According to PN-EN 13566-1, 13566-4 and PN-EN 1610

6. CORRECTION OF FLAWS
Flaws are corrected using a robot controlled via a camera or / and inserting and gluing short pipe sections.