Description of Process
Kembla’s spiral wound pipe slip lining (SWP SL) system comprises a method whereby a pipe or liner is formed in-situ by spirally winding a PVC profile strip into a host pipe normally from an existing manhole.

A major advantage of this system is that because there is a hollow opening along the entire length of spiral wound pipe at all times then sewer over pumping is not normally required and emergency flow situations can be accommodated by simply stopping work and allowing the flow to discharge through the opening in both the winding machine and the SWP SL pipe.

Installation
The T-Ribbed PVC profile strip is brought to site on a large spool.

The special winding machine is set up in the base of the access chamber or pit in line with the existing pipe.  The winding machine can be dismantled into components and re-assembled in the chamber if the opening is too small.

The plastic strip is fed down into the machine which spirally winds it into the required diameter.

As the spiral wound pipe exits the machine it is propelled into and along the existing pipe. The process continues until the other access is reached.

The small annulus space between the SWP SL pipe and the existing sewer is then grouted to complete the installation.

Available Sizes
The SWP SL system is offered for larger pipe diameters from 750mm to 2.5m.

Kembla’s SWP DiaFit system is of the type that is expanded against the internal surface of the existing pipe and is offered in the diameter range 225mm to 600mm.

Materials
The SWP SL pipe is made from a PVC strip that has been factory extruded to ISO 9001.

SWP DiaFit and SWP SL brochure