Large diameter municipal sewer trenchless No-Dig rehab by CIPP UV technology

Preparation of UV curing construction instructions:

The drainage pipeline is gravity flow. The upstream (the front section in the downstream direction) and downstream (the rear section in the downstream direction) of the pipeline shall be determined in advance, so as to determine the sequence of repairing dragging materials.

If the site space allows, it is suggested to drag the bottom film and materials in the following order: starting from the upstream direction and dragging along the downstream direction.

1. pretreatment:

Ventilation, water stop, pumping, dredging, and cleaning. Ensure that there is no ponding, water leakage, foreign matter, serious deformation or dislocation, and other defects inside the pipeline.

2. robot CCTV inspection to determine whether it can be repaired

3. pull the bottom film with a robot: (use braided rope, do not replace the rope at will, otherwise the material or membrane will rotate in the pipe)

The connection buckle between the rope head and the bottom membrane shall be firmly fastened, and another rope for pulling materials shall be put on the upper end of the bottom membrane (if a winch is used, it shall be a steel wire rope). During the membrane pulling process, ensure that the materials and ropes are not mixed with the rotation of the bottom membrane.

For long-distance materials with large pipe diameters, soapy water can be added to the bottom film to reduce the friction when the material is dragged.

Daoyunai Energy Saving Technology Limited has been committed to manufacturing trenchless CIPP UV cure systems with liners and CCTV inspection crawlers for underground pipelines to service customers all over the world.

The product range covers four series and more than 20 models in the underground pipeline trenchless repair industry:

1. UV curing and repair integrated system D919: LED lamp curing and high-voltage mercury lamp curing.

2. UV cure liner: from diameter DN200 up to DN1800

3. Hot water cure liner: impregnated liner to invert by water gravity and cure by hot water

4. Pipeline inspection robots crawler D18 and D18s: CCTV video inspection of pipeline defects

5. Pipeline periscope D16S: quickly  view the internal defects of the pipeline

Headquartered in Shanghai, Daoyunai has a number of independent intellectual property rights and also has a manufacturing base and R&D and testing center in Suqian City, Jiangsu Province, covering an area of more than 35000 square meters, which fully implements the international quality management system.

Focused on producing trenchless CIPP system with liners and inspection CCTV

Committed to providing solutions for reducing costs and improving efficiency