The Process in detail

Initial Scope

Upon inspection of the drainage pipe we establish if the lateral is a candidate for lining.

We then identify if the work to be done is a spot repair, sectional liner or full length liner.

Options are established and what sort of restoration work would be required if Nu Flow is not the preferred/ideal solution.

Prior to the start of the project, we will explain the process to you.

1. Video of the problem                                                                 
   
2. Procedures/ compressor operation
3. Chemicals safety
4. Cure time
5. Results to be achieved
6. Bathroom options/water restrictions

We prepare the line - Ensuring the pipe has no flow by inserting a plug in front of the repair (water flow can interfere with the retrieval of process as is the case with weeping tile).

Next, we clean roots and any calcity, etc. with our root cutter. Cast pipe may require additional preparation if the pipe is badly corroded or there is a void in the pipe. Identifying any off set joints, void pipe, 22 degree, 45 degree and 90 degree bends.

The length of the repair of the repair is measured by taping off the camera cable. The camera is then pushed to the furthest point of the repair and the cable taped. 

The making of the Liner

We measure out the felt using the camera cable and add 250mm of liner at each end. The liner comes from the factory with release plastic surrounding the rubber.

There is a vinyl strap that runs throught the entire length of the roll. This strap is used to stop over-expasion of the rubber and will be explained in the following text. The final pieces are short vinyl retaining sleeves that are attached to both the pull end, and the air end. These sleeves also stop the rubber from over-expanding.  See below figure. 

Assembly - Air End

We trim the liner back on each end so that the rubber is longer than the felt by 1600mm on 80mm & 110mm liners and 230mm on 160mm liners. See next figure.

We insert the pull end into the rubber. Fold the rubber in on both sides of the end as tight as possible to ensure an air tight fit.

The vinyl retaining strip that is inside the rubber is taped against the pull end at the same time as the rubber.  After the rubber is taped tight, we fold the extra strapping back against the pull end body. See below.

A vinyl retaining sleeve is cut to a length that starts at the front edge of the pull end and reaches up into the liner.

We slide the retaining sleeve up inside the plastic or the retaining sleeve. The vinyl is folded tightly around the pull end. The last step is to add three gear clamps to the end .

40mm & Nu Flex end

How we install the liner.

Direct Down Stream

• We run line from the house clean out down to the main (If necessary we use a camera to push the bag down to the main). We let the bag float down stream to the manhole.

Direct Up Stream

• We run the line from the house clean out down to the main. Retrieving the line by running the camera, mounted with a retrieval hook down through the main. Using the camera to see the bag coming out from the lateral.

Indirect Up Stream

• We run a line down stream from manhole B to manhole A. We also run a line from the clean out to the main and downstream to manhole A.
• The lines are fastened together at the down stream manhole A and pull back to the up stream manhole.

If you wish to talk to our Nu Flow team please call us on 0800 949 344 or contact us for more information.