TPi March 2019

Plastic & composite tubes

Trio of awards for Radius Subterra and partners

The Mayflower Water Treatment Works, which is under construction at a site near Roborough, north of Plymouth, UK, will replace the existing Crownhill WTW, which dates back to the 1950s and has reached the end of its service life. The construction works include the installation of a new 7 km potable water pipeline to replace the current raw water main and connect the new site with the existing distribution network from Crownhill. A section of the existing 1,000mm ductile iron raw water main is located near Whitleigh Wood, an ancient woodland managed by the Woodland Trust. The environmental sensitivity of this natural spot meant that using the traditional open-cut technique to install the new pipe would be unsustainable, and contractor Kier engaged Radius Subterra to determine the feasibility of using trenchless installation techniques. Radius Subterra offers pipeline rehabilitation solutions for water and wastewater networks using trenchless installation techniques. By eliminating the excavation requirements of traditional installation methods, Radius Subterra’s specialist technologies can be used in areas of restricted access, with minimal disruption to the surrounding environment and structures.

A consortium including South West Water Delivery Alliance H50, Kier, Arcadis and Radius Subterra has won the UKSTT Project of the Year award, the New Installation – Water & Wastewater award, and the Environmental award at the 24 th Gala Dinner and Awards ceremony, for the companies’ work on the Mayflower Water Treatment Works slip-lining project. The awards recognise companies that can demonstrate substantial and real benefits of the use of trenchless technologies in each of the different categories.

PE pipe being pulled through host main

For this particular project, Radius Subterra recommended using slip- lining, a simple trenchless installation technique whereby a new polyethylene (PE) pipe with an outer diameter smaller than the bore of the existing main is either pulled or pushed into the host pipe. As PE pipes can be joined together using the butt-fusion technique, long lengths of pipe can be installed quickly and efficiently. A total of 1.6 km of 800mm PE potable water pipe supplied by Radius Systems was successfully installed using the slip- lining technique and inserted into the existing ductile iron host pipe without disruption to the natural habitat. A pipe SDR of 11 was selected, as this would give South West Water the pressure and capacity required to satisfy the growing demand for drinking water in the area. John Williams, project manager for Radius Subterra, said, “Working on such an impressive project has been challenging and rewarding. The works have gone very well and we completed the installation and commissioning of the pipeline within the agreed timescale.” Radius Subterra – UK radius-subterra@radius-systems.com www.subterra-pipelines.com

Long length of 800mm PE pipe being joined

Radius Subterra won the Project of the Year award

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TUBE PRODUCTS INTERNATIONAL March 2019

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