WET News

sEPTEMBER 2015 WET NEWS 19 TEchkNoW • A 185kW rated axial flow turbine was proposed on the existing inlet main upstream of the flash mixer • The existing north main butterfly control valve was replaced by the turbine • The south main has a Larner-Johnson flow control valve that comes into operation automatically should the turbine shut down • The hydroturbine scheme uses the 11.5m head of water into the works from Derwent Reservoir • The turbine connects to a bespoke MCC panel "From the outset this project was a challenge, as we always knew. We were up against the clock... The attitude, focus and passion shown by all involved has been first class" Noel Cooper, Northumbrian Water NEEd To kNoW 1 Mosswood WTW operates at a maximum flow of 160 ML/d, with an average flow of 136ML/d 2 The site supplies water to sunderland, south shields and Washington with an additional pumped supply to Castleside 3 The existing site was built in the 1960s, and the facility is one of NWL's largest water treatment works 4 The 1M project had to be done while maintaining the operational workings of the site provide automatic "bump- less" transfer of flow from turbine to bypass in the event of a shutdown while maintaining control of flows into the flash mixer: Achieved using a PLC to monitor the turbine and flow control valve conditions, along with inputs from newly installed ultrasonic level instruments and existing site flow-meters. Health and safety was a high priority from the scheme's inception due to the fact that confined space working, li€ing operations involving large items of equipment in restricted spaces, large excavations and working at height were all present on the scheme, which was conducted in a live operational environment. Control and planning of tasks involving a multi-disciplined team in limited space was a priority, with daily briefings being a valuable tool in highlighting the risks and undertaking the processes safely. The team demonstrated exemplary health and safety performance, including; 21,290 hours worked, 365 people working on the project on site, 0 reportable injuries, 0 dangerous occurrences, an Accident Frequency Rate (AFR) of 0 and only one minor injury. Eighty-eight behavioural discussions were carried out by the project management team, which are observations of workplace behaviours followed by discussions intended to challenge unsafe behaviours, to reinforce safe behaviours and provide trend analysis information. The installed hydroturbine at Mosswood provides the facility with approximately 150kW of its base load electrical demand, through entirely renewable means. Using the natural 11.5m head of water into the works from Derwent Reservoir the turbine is producing more power than stated output under most head/flow conditions. The project at Mosswood WTW was NWL's first retro-fit hydroturbine installation into an operational water treatment works. The scheme was also recognised by NWL's Water Production manager, Noel Cooper who comments: "From the outset this project was a challenge, as we always knew, we were up against the clock… The attitude, focus and passion shown by all involved has been first class." The project was com- missioned within the planned programme and the system produces power to offset site demand and accrue FITS payments, whilst not impacting the primary function of the site – producing high quality potable water for Sunderland, South Shields and Washington. Alan Morritt is project leader with JN Bentley PRoJEcT SPEcS • Design and construction of a new • Maintain operational workings at the site • Propose solutions for a viable hydropower option Effective and reliable odour & H 2 S removal from ERG Early bird expires 30 September Partners Supporters Sustainability Leaders Awards Awards 2015 Celebrate with the leaders. Join us for the biggest night in sustainability! 19 November Grand Connaught Rooms London www.awards.edie.net BOOK yOuR tABLE NOW! edie.sus_awards-earlytable-86x125.indd 1 12/08/2015 16:22

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