WET News

SEPTEMBER 2015 WET NEWS 11 The narrow access of Redcross Lane is clearly seen outside the building beneath which the damaged sewer runs. Inset: The sewer beneath Redcross Lane blocked with stones brick and other hard materials In wastewater collection, information can be the biggest innovation of all. With monitoring and control solutions from Sulzer, you have the tools to see events in your pumps and pumping stations – and to influence them in real time. Our easy-to-use solutions are as simple or as comprehensive as you like, ranging from all-in-one units to modular systems with expandable functions. Working on site or from a PC or smartphone, you can use them to save energy, save time and prolong the lifetime of your pumps and network. Game-Changing Collection Insights For more innovation in wastewater collection, visit www.sulzer.com had luck on our side as well, given the bridging of the defect by some of the materials above the pipe. Ultimately the trenchless option cost us less than £10,000 as compared to something in the region of £100,000 for the excavation option and all its additional customer care costs." High Risk Another recent problem solved using this mindset was the repair of a burst on an existing 100mm diameter cast iron rising main from Fisherman's Walk Sewage Pumping Station (SPS) in Bournemouth earlier this year. The 52m long rising main, laid in 1977, runs within a steep cliff face with the SPS located at the bottom between the cliff face and the promenade, adjacent to a toilet block and a number of beach huts. The 27m high cliff face is prone to movement and land slips, which is believed to have been the likely cause of the burst which lay some 6m into the cliff face from the wet well end of the rising main and at a depth of 4m. Initial thoughts were that a new rising main could be installed using directional drilling but knowing that the steep cliff face was prone to movement could have made such an operation high risk and potentially dangerous as the drilling may have caused a significant land slip. Such a solution would also have involved significant temporary works, further adding to the costs. The only other replacement option was to take the discharge to a different part of the sewerage network by installing a 950m long rising main within the Bournemouth promenade which would have caused widespread disruption and cost in excess of £950,000. So it was decided that a rehabilitation solution for the existing rising main was preferable as it would not affect the surrounding soils thereby minimising potential for cliff instability. Wessex Water approached Onsite with a view to establishing how this could be achieved. Working closely with the Wessex Water design team, Onsite was able to bring together a liner design, installed from the wet well at the base of the cliff, that would not only repair the burst in question but also provide a reinforcement of the rising main into the future. The in-house design comprised a 'dual skin', steam cured, glass-fibre reinforced, 3.5mm thick liner, which was further reinforced by the introduction of a 2mm thick non-reinforced liner which allowed for easier installation and provide additional stiffness once cured. This combination liner not only enhanced the overall stability of the liner but also provided high resilience to potential pressures fluctuations which might be experienced The 2 nd annual Water Industry Supplier Conference is the only event that exclusively brings together senior directors from UK water sector consultancies, contractors and subcontractors, equipment manufacturers and service providers of all sizes. Expert speakers include: Attend this unique one-day event to: • Explore innovative approaches to manage better your relationship with water companies • Learn how to develop a more proactive approach to supply chain engagement • Understand what is important to water companies' customers and how that influences utilities' programmes • Find out how to implement BIM successfully to maximise efficiency • Discover how you can deliver tangible and genuine efficiencies through collaborative working practices • Learn how to incentivise collaboration through commercial and contractual arrangements • Hear what Totex means for the water industry and its impact on the supply chain Jointly organised by Sponsored by Supported by Book now at www.WWT-supplychain.net Follow us @wetnews using #watersupplychain Clive Deadman Chairman, Energy Innovation Centre Investment Forum; Council Member, Institute of Asset Management Chaired by Scott Aitken Managing Director, Water, Black & Veatch Stuart Rothery Director of Operations, AECOM Bill Thicknes Operations Director, London and South, J. Murphy & Sons Dale Evans Director, @one Alliance James Eaton Global Head of Digital Engineering, Laing O'Rourke David A Smith Chief Strategy Officer, MWH Global WaterIndSupp15-HPH.indd 1 10/08/2015 15:41

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