No Compromise, Between Free Passage and Hydraulic Efficiency

Case Study: How Kilkenny County Council took advantage of the S-tube effect

The situation

A municipal pumping station servicing a large population of industries, commercial businesses and residential homes in Kilkenny city, Ireland, suffered frequent clogging incidents. The increased downtime meant a constant risk of overflow and as each incident amounted to €300 in service costs, the clogging became a costly affair. Kilkenny County Council came to Grundfos for a solution.

The Grundfos solution

Based on the load-profile of the system and the duty point of the old pump, a Grundfos SE pump with the unique S-tube impeller was offered. The high total efficiency of this range made it possible to replace the existing 30 kW pump with a 22 kW model, boosting total efficiency from 58% to 70%. Designed to handle rag-filled raw sewage, the S-tube impeller was ideal to battle the clogging problems.

The outcome

Based on the load-profile of the system and the duty point of the old pump, a Grundfos SE pump with the unique S-tube impeller was offered. The high total efficiency of this range made it possible to replace the existing 30 kW pump with a 22 kW model, boosting total efficiency from 58% to 70%. Designed to handle rag-filled raw sewage, the S-tube impeller was ideal to battle the clogging problems.

The outcome

The Grundfos solution delivered astonishing results:
  • Not one clogging incident during the 6 months since installation
  • Huge savings in service and maintenance costs
  • Large reduction in energy consumption and CO2 emission
  • A payback time of less than 2 years
See more at uk.grundfos.com/no-compromise.html
S-tube
"Kilkenny County Council is not so easily impressed, however the Grundfos solution we installed exceeded their expectations. They are now in the process of converting similar sites in the county to S-tube impeller pumps. This lead by Kilkenny County Council should be an example to neighbouring county councils. - Simon Cantwell, Managing Director, Cantwell Electrical Engineering”