Water & Wastewater Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/851629
24 | AUGUST 2017 | WWT | www.wwtonline.co.uk Archimedes screw pumps boost local water infrastructure in Mansfield Archimedes screw pumps may work on a centuries-old design but they are still the most efficient way of li ing water over a short distance. Here, we learn more about their operation at a recent installation at Severn Trent's Mansfield STW By Jamie Wesley ConTraCTS Manager, WaTer ConTrol DiviSion eCS engineering ServiCeS The Knowledge Pumps and Pumping Systems W hen three Archimedes screw pumps at the inlet of Severn Trent Water's Mansfield Sewage Treatment Works required replacement, NMCNomenca contacted ECS Engineering Services to source and install new pumps. As the exclusive UK service agent for Landustrie Archimedes screw pumps, ECS was able to replace the screws to bolster the water treatment infrastructure at the site. Mansfield Sewage Treatment Works lies adjacent to the River Maun, processing the majority of effluent water from farms and homes in the surrounding area. The three original screw pumps at the inlet station had been operational since the 1970s, and were displaying a drop in efficiency due to overall wear. As the pumps were beyond refurbishment, the Tier 1 contractor for Severn Trent Water, NMCNomenca, called on the services of ECS to deliver a solution. ECS was selected due to a proven track record, having previously installed similar systems at the Warmsworth and Melton Mowbray. ECS Engineering Services proposed the installation of three Landustrie screw pumps, each offering a maximum pumping capacity of 800 litres per second. Market leaders in the screw pump industry, Dutch manufacturers Landustrie deliver 100 years of industry experience to its range of pumps. Each of the 14-ton Mansfield screw pumps is expected to last 30 years in operation, providing one of the most efficient methods for moving effluent water over a short distance. Each pump needed to be replaced individually, in order to ensure the Mansfield works could still service operational demands during the project. The timeframe for replacing each 13.5 metre long pump was around 8 weeks. Initially, the original screw pumps were removed by crane, so that they could be transported off site for recycling. Bearings and drives were then replaced, with the new screw craned into the trough to be installed subsequently. Next, the hand re-screeding The three landustrie screw pumps installed at Mansfield each offers a maximum pump- ing capacity of 800 l/second The re-screeding process involves rotating the screw at reduced speed and adding screed.