WET News

12 WET NEWS JUNE 2016 The essen al show for essen al services Thank you for a ending U lity Week Live 2016. We look forward to seeing you next year. To watch the show highlights video, visit www.u lityweeklive.co.uk www.u lityweeklive.co.uk To place your brand at the heart of UK u li es, please contact: RACHAEL LYON Business Development Director T: 01342 332097 E: rachaellyon@fav-house.com NICKY SHAW Exhibi on Sales Consultant T: 01342 332070 E: nickyshaw@fav-house.com ESSENTIAL INFORMATION NEC Birmingham, B40 1NT 23rd May 2017 - 24th May 2017 One of the boreholes was located directly above the sewer line The lining will increase longevity by 200 years of the most demanding in his career. At points loose friable rock in the roof required fore- poling ahead of the head trees with 18mm high tensile steel rebar. Wessex Water had set maximum vibrational limits of 10mm/sec peak particle velocity at the façade of adjacent habitable properties, which it monitored, giving a general reading of less than 2mm/sec during the works. Also, the noise levels were recorded to ensure environmental compliance, and these were below the 69dBA level set. Whilst the timber heading was being brought to a conclusion and the pipe build back was underway Onsite attended site to evert the ƒ rst of the two liners downstream. The liner was designed as Fully Deteriorated to ASTM F1216 :09 and the quality of manufacture and installation was controlled by BS EN ISO 11296 ; 2011. The liner constituted a polyester needle felt carrier tube by Applied Felts, saturated in a styreneated polyester resin and cured by hot water, ensuring the lining was pushed out to the internal periphery of the sewer to be lined and giving a ƒ nal thickness of 15mm. An aspect of the Fully Deteriorated design allows for the 'K' factor. The 'K' factor is a representation of the of the enhancement factor which was developed in the early days of CIPP by Coventry University, and is an empirical factor. For no radial restraint, i.e. a large annulus between liner and host pipe, a value of 1 is appropriate; the value of K becomes greater as the ƒ t of the liner to the host pipe becomes tighter. Of course the brick sewer is most likely to vary in diameter, especially here as the sewer was constructed in a heading of limited cross sectional area, dominated by the strong rock geology, interbedded with weak mudstones. It was therefore imperative that close attention was given to a close ƒ t liner, at design and manufacturing stage. The second liner was completed to the same speciƒ cation through the repaired collapse and styrene complaints were avoided by using a thick pre-liner. Cost savings To have replaced the sewer line by traditional open cut would have been unthinkable. Some 5,000 tonnes of material would have had to be removed, with an equal quality of back ƒ ll, requiring hundreds of lorry movements over an estimated eight-month period, in comparison to the eight weeks actually required on site Juxtapose that to the com- pleted sewer relining, which meets the mitigating require- ments encouraged by legisla- tion such as the Landƒ ll Tax, Carbon Tax and Aggregate Tax. When public and contrac- tor safety are considered along with the massive cost savings the ƒ nal solution was outstand- ing, especially as Wessex Water has calculated its general values for CO2 as 95% less than open cut. The key thing for Wessex Water is that it has preserved history of the sewer, while using the lining technique to minimise customer disruption. Britton concludes: "I think the success has been based around the trenchless technology and no-dig aspects that we use every day. It means that we mitigate the impact on our customers because the works are over quicker, while also reducing carbon dioxide emissions by 97% and saving costs." ■ Richard Wortley is operations manager at Onsite. LEADERS IN CORROSION PREVENTION & SEALING TECHNOLOGY Winn & Coales (Denso) Ltd Tel: 0208 670 7511 l Web: www.denso.net Let Denso Transform Your Pipebridge! ...Act now before it's too late! If you have a deteriorating steel pipebridge, the Denso Steelcoat 100/400 System can save it, normally long after alternative conventional coating remedies cease to be effective. In compliance with enviromental restrictions against shot blasting, over rivers etc, the system only requires simple hand tool surface preparation and once applied properly will give a minimum of 20 years maintenance free service life. Only Denso can offer this amazingly long service life from simple hand tool surface preparation. Contact us if you want more information or require an obligation free survey of your pipebridge:

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