Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/671821
MAY 2016 WET NEWS 13 from QTS to calculate the flow rate requirements for the scheme to ensure that a safe working environment was provided at all times. The result was a mix of Super Wispaset 100mm and Super Wispaset 150mm silenced pumps, which ensured water could be safely pumped away from the working area. The Super Wispaset 100 pumps are capable of pumping 45 litres a second and the Super Wispaset 150s can pump 90 litres a second but both operate at less than 65dBA at a distance of 7m, ensuring that any issues of nuisance noise for local residents was avoided. This was particularly important as the pumps had to remain operational 24/7 throughout the project despite the fact that most of the construction and engineering work took place during weekend shut downs between 23.35 on a Saturday night and 09.00 on Sunday morning. The business critical nature of the over-pumping operation throughout the scheme also meant that fuel supplies and regular maintenance were an important part of the pump hire contract. Sykes Pumps provided bunded fuel tanks to feed the pumps on site and a pump engineer visited the site every two weeks throughout the programme to carry out routine maintenance. The company also provided hundreds of metres of pipework for the installation, delivering the equipment to site and carrying out full set up and commissioning to ensure that the water was pumped safely away from the work area. Pipe replacement With the over-pumping infrastructure in place, the QTS team could begin the water management improvements by replacing the existing 600mm twin wall carrier pipe with a PC concrete carrier. De-vegetation was then car- ried out to enable further inves- tigation works, ensuring that survey targets could be sighted. The project team then replaced the existing 250mm diameter track drainage pipe between sidings one and two, along with a section of 350mm diameter track drainage pipe in the 4m between sidings one and the down goods line, which had become blocked due to the calcium carbonate deposits. The pipes were replaced using carrier drains formed from pre-cast open concrete units with GRP mesh grid covers, which will divert run off from the track bed and carry it through to the existing open ditch outfall, creating a solution that will be much easier to maintain than the old buried pipe arrangement where there was no way of managing the impact of calcification with cleaning and maintenance regimes. At the southern end of the site, the existing UTX drainpipe was 350mm in diameter and discharged water into an open ditch in the cess. As the capacity of this pipe was assessed as sufficient for the outfall required, these arrangements were le• in place. An over-pumping operation was selected to keep the site dry MAY 2016 WET NEWS 13 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: www.teekaycouplings.com tel: +44 (0)1494 679500 The pumps had to remain operational 24/7 throughout the project Flood risk was an issue as thge area is known for high levels of rainfall