The wastewater industry traditionally had to choose between selecting a pump that delivered energy efficient performance or free passage. Today the Grundfos S-tube with its unique impeller has alleviated that situation as with it there are no dead zones and no cutting or moving parts that can get worn out over time.
Just such a scenario faced a water utility company in the south west at a WwPS where they were suffering high operating costs and many disruptions. This situation had resulted in call outs which needed to be followed up by vacuum tinkering and resulted in 15 blockages over a 3 month period necessitating vacuum tanker cleaning events to remove rags and clean the pump chamber.
Grundfos were asked to look at the pump station and selected the SL1.80.80 Atex rated S-tube wet well submersible pump to improve the performance of the pump station. This pump had a solids handling capacity of 80mm whilst maintaining an efficiency of 63% therefore there was no compromise between pump efficiency and solids handling capacity – a key feature of the S-tube impeller.
The introduction of the Grundfos S-tube impeller pump brought about major reduction in operating costs and disruption as blockages were reduced from 15 over three months to zero; there was no further need to use the vacuum tanker to empty and clean the chamber; reactive call outs were reduced from 31 to 8 over the period of the trial.
This, now permanent, solution has also brought about operational savings of £5000+ in the initial 3 month period of the trial. A true win/win situation.