Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/917412
The customer benefitted from an environmentally- friendly auto prime electric pumping regime 18 WET NEWS JANUARY 2018 Overpumping the green way A n environmental- ly-friendly and highly-ef- ficient solids handling pump proved an ideal solution when Selwood was contacted by Bridges Electrical for assistance with a complex operation. Wessex Water contracted Bridges Electrical to carry out upgrades at Westover pumping station, near Langport in Som- erset. The upgrade work included replacing pumps, fit- ting new stools, replacing con- trol valves and concrete repairs to the base of the wet well at the pumping station, which is strategically important and is in an environmentally-sensi- tive location on the edge of the River Parrett. The challenges were several-fold: l Temporary overpumping was required to deal with all incoming flows from the sur- rounding area and deliver through a 500m existing underground rising main through to Langport sewage treatment works l Overpumping had to be capable of providing up to 70 litres/sec at 27m total gener- ated head – a challenging task indeed. Further issues to overcome were lack of space available within the perimeter of a very small pumping station. There was not enough space to place a traditional end suction diesel pump and access to the man- hole was so small that a tradi- tional electric submersible pump was out of the question. Given the station's sensitive location, a pumping solution prime electric pumping regime, saving the cost of run- ning diesel driven equipment. In addition, this was a friend- lier solution to the local envi- ronment by eliminating the risks of diesel fuel spills near the river. "By developing very good working relationships at all levels between Bridges Electri- cal and Selwood and the client Wessex Water, this made it possible for all parties involved to have an input in open dis- cussion and find a robust solu- tion together." Fin McDermott, senior pro- ject manager for Bridges Elec- trical, says: "Selwood's response time to the enquiry should be commended. Phil Ingleheart was made aware of the criticality of the works and attended a site meeting to review the requirements with- out delay. "While on site scoping the requirements, safety was at the forefront of Selwood's survey- ing process and their special- ists completed a site-based risk assessment to ensure access, li•ing, and security were con- sidered with each step. I was impressed by their commit- ment to having a full apprecia- tion of the site restrictions and a detailed understanding of the pumping requirements." McDermott adds: "While on site Bridges and Selwood worked in partnership to install and commission the overpumping system. This col- laboration speeded up the installation time and pre- vented delays with refurbish- ment of the wet well. The pumping station and is located in an environmentally- sensitive location on the edge of the River Parrett THE CONCEPT • The new S200 electric drive pumps matched the operation's incoming flow and rising main head requirements • The pump has a capacity of 560m3/h, a total head of 23m and can transfer solids sizes up to 100mm • A 200kw inverter control panel with ultrasonic control panel and transducer was also provided NEED TO KNOW 1 There was not enough space to place a traditional end suction diesel pump 2 Access to the manhole was so small that a traditional electric submersible pump was also out of the question 3 Overpumping had to be capable of providing up to 70 litres/sec at 27m total generated head using electric rather than die- sel drive was highly desirable. Selwood's pump rental spe- cialists carried out a site sur- vey, including discussing the various options with the cli- ent. The company was able to provide a bespoke solution by supplying one of the new S200 electric drive pumps, a model that was able to match the incoming flow and rising main head requirements for the operation. The S200 is part of the sol- ids handling S range offering trouble-free pumping of raw or screened sewage, sludge or slurry, water with fine and large solids, and water con- taining rags and fibres. The S200 features a capacity of 560m3/h, a total head of 23m and can transfer solids sizes of up to 100mm. Due to the confines of the site, standard 8in wire armour hoses were deemed to be too long and did not provide enough flexibility. Eight-inch flanged composite hose, sup- plied in shorter 5• lengths and significantly more flexible that wire armour hose, proved to be the optimal solution. Selwood also provided a 200kw inverter control panel with ultrasonic control panel and transducer. Installed and programmed by Selwood's own electricians to the require- ments of the client, it provided ease of use throughout the application. Phil Ingleheart, framework manager for Selwood, says: "Our solution meant that the customer benefitted from an environmentally-friendly auto THE VERDICT "A difficult job was made simpler with collaboration of the Wessex Water team and framework suppliers" Fin McDermott, Bridges Electrical • INSIGHT Pumps & pumping systems When overpumping was required during an upgrade of a Somerset pumping station, renting an electric-powered solids handling pump proved the solution.