Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/437549
makeover The connection to Riverhill Reservoir delivery mains was extended 80m to bypass now redundant fragile pipework makeover "By carefully re-routing new supply pipe- work, about half the original site area is now redundant and demolition of the old struc- tures frees up this land for redevelopment or sale." www.z-tech.co.uk 01223 653500 engineers@z-tech.co.uk Complete one-stop in-house solutions from dig to data: • Flowmeters • PRV's & Needle Valves • Burst Detection • Pumping Sets & Stations • Pressure & Level Monitoring Complete one-stop in-house Complete one-stop in-house Complete one-stop in-house Complete one-stop in-house Complete one-stop in-house Complete one-stop in-house Complete one-stop in-house Problem Solvers 24/7 EMERGENCY RESPONSE SERVICE Margaret Herron Chief Inspector of Drinking Water, Drinking Water Inspectorate for Northern Ireland Now in its sixth year, WaterNI is the only conference that brings all the major stakeholders together to discuss the current and future pressures facing the sector. Timed just after the next price control (PC15) and consultation on the Long Term Water Strategy, the event will again bring together representatives from government, the environmental and economic regulators, utilities, NGOs, contractors and consumer bodies. The 2015 conference features interactive workshops focussing on Customer engagement and satisfaction, Energy efficiency and energy recovery and Sustainable wastewater treatment works. Conference topics include: • Transforming delivery for the customer in PC15 • Sustainable land use management and water quality • The environmental policy landscape for PC15 • How we can work together to deliver a better drainage solution for Belfast • Unlocking innovation through capital delivery in PC15 • NI Water and Irish Water Plans for EU INTERREG V Environmental Projects 2015 to 2021 Organised by Supported by Trevor Haslett CBE FICE Sara Venning Chief Executive, Northern Ireland Water Tanya Hedley Director of Water and Gas, Utility Regulator John McLenaghan Chairman of Environment Committee, Ulster Farmers Union Chris Mills Director of Resource Efficiency, Northern Ireland Environment Agency Supported by Dave Foster Director of Regulatory and Natural Resources Policy, Department of the Environment CHaIr BOOK NOW at www.WWT-ni.net experT SpeaKerS INCLuDe Follow us @WWTlive using #waterni Co-sponsor WaterNI-2015-brochure.indd 1 11/12/2014 15:46 The design and build con- tract awarded to J Murphy & Sons centred on the existing 9,500m³ capacity concrete stor- age tank. Some 2km of new, mainly ductile iron, pipework, varying from 250mm to 500mm diameter, also altered and improved the water flow route around the site. Logistical exercise The main construction chal- lenge during the contract was the high number of partial or total plant shutdowns needed while installing new pipe con- nections into the existing mains. Of the total ten shutdowns, four required temporary closure of a borehole supply and three inter- ruption of the delivery main to a service reservoir. But the remaining three demanded a total plant shut- down, as new inlet and outlet pipes were installed in the con- tact storage tank. Loss of supply averaged between six and eight hours, predominantly during the night. But every shutdown proved a major logistical exer- cise with Murphy providing SEW with a detailed statement, set- ting out precise construction methodology. The most crucial shutdown was for the existing buried con- tact storage tank to install new bellmouth-shaped pipes through 250mm thick reinforced concrete tank walls. These works required an exceptional seven day shutdown for each of the reservoir's two cells. Here 500mm diameter angled pipe sections had to be inserted through pre-cored holes close to the tank's under- ground base. Pipe sections were installed by a five-man crew, operating under confined space working conditions from inside a 5m long rectangular excavation 3.8m deep. 'Watertight' The crew were located both sides of the enclosed tank and a specialised confined space res- cue team was present through- out. A bespoke C40 concrete mix was designed to ensure rapid but 'watertight' curing around pipe flanges, with form- work stripped a"er just two days. During this pipe insertion, the empty tank cells were