Submersible and conventional pumps manufacturer Bedford Pumps has just completed a contract in excess of £1.25 million with Yorkshire Water for the refurbishment of the Don Valley Sewage Pumping Station, UK.
Don Valley SPS is part of a £78 million investment from Yorkshire Water for Blackburn Meadows Wastewater Treatment Works. The Don Valley Pumping Station site originally housed five A P E Allen mixed flow vertical spindle units to lift sewage 21.4m to the inlet works. These pumps were at the end of their working life and no longer able to cope with the demands of the pumping station. As a result sewage debris often entered the River Don during heavy rainfall.
Bedford Pumps replaced the original units with six conventional shaft driven volute pumpsets.
The pumps are of a centrifugal, mixed-flow design and the largest of the six pumps can handle up to 215mm spheres of untreated raw sewage.
The station has been designed within a wet well sump that is divided into two halves. Each half is a mirror image of the other and is designed to function with one half operational and one half isolated. Bedford Pumps units must therefore provide sufficient total pumping to achieve full FFT from one half of the wet well only.
Bedford Pumps said it achieved this criteria by suggesting that each half of the sump houses an identical set of three pumps, of varying sizes. The pumps are installed in a vertical configuration.
The largest pump has a duty of 2 m3/second at 26m head driven by 645kW 6.6kV motors. The next size down operates at 1.5 m3/s at 27.4m head powered by 505kW 6.6kV motors. The smallest pumps run at 0.85 l/s at a head of 28.4m from 300kW 6.6 kV motors.