Tight-fit liner compact pipe

  • Name – Compact Pipe

Technical description of a rehabilitation method
tight-fit liner compact pipe
according to PN-EN 752-2; 752-5, 13689; ISO 11296-1; ISO 11296-4. 

1. Material

Compact Pipe tight-fit lining rehabilitation method uses polyethylene pipes of factory-reduced cross-section pipe. Depending on local conditions, the pipes can be made of PE80 or PE100 and can have different SDR for specific diameters.

2. Liner installation equipment

  • cleaning equipment (pressure truck, scrapers)
  • remotely controlled inspection camera
  • remotely controlled milling machine
  • pipe welding unit (butt-welders and resistance welders)
  • guide rollers
  • pulling machine (pipe puller)
  • steam generator
  • by-passing unit (pumps, hoses)
  • expander (for calibrating liner diameter)
  • testing equipment
     

3. Preparation to installation

Before starting the rehabilitation process, it is necessary (if required) to construct special by-passes ensuring continuity of supply. Once a pipeline section is isolated, it is cleaned and inspected using a remotely controlled camera. The video (or DVD) footage is used for preparing a detailed digital report on the pipeline’s technical condition.

4. Installation

A towline is pulled into the pipeline. To the end of the towline a guiding head is connected (using a swivel shackle). It is connected (through a thermally-connected PE-HD plate) to Compact Pipe. Once the whole liner section is unwound from the transport drum and pulled in, the liner is cut and the end is secured by butt-welding a temporary plate that makes it possible to connect the process head.

Steam and compressed air hoses are connected to the head. When the liner is equipped with temperature and pressure sensor and a steam / condensate separator is installed at the end, the proper installation process begins. 

Compact Pipe liner is heated with steam until it reaches the required temperature then compressed air is supplied. It inflates the pipe and tightly presses it to the walls of the existing pipeline which causes cooling of the plasticized Compact Pipe liner.

When the installation process is complete, the guide head and the temporary plate are cut-off. Bare ends of Compact Pipe liner are calibrated using a hydraulic expander equipped with strengthening sleeves and connected using a resistance sleeve with appropriate adaptor or another section of Compact Pipe liner.
 

5. Inspection

5.1. TV Inspection

After the installation and opening connections, acceptance TV inspection (including VHS or CD recording) is carried out. Inspection report is also prepared.

5.2. Tests

According to PN-EN ISO 11296-1, 11296-4.

6. Correction of flaws

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