Flygt Sanitary Lift
Application: Sanitary Lift Station
Pump Details: 290hp Flygt 42” Diameter Submersible
Pump Type: Submersible Axial Flow
A large axial flow pump from a municipal sanitary district was sent to Hydro after exhibiting extremely high vibration. Hydro’s submersible pump repair team determined that a large chunk of concrete debris from nearby sewer construction had caused the failure. The municipality faced a lead-time of 14 weeks for a new impeller from the OEM, but they could not afford to have this pump out of operation for that period of time.The sanitary district accepted Hydro’s offer to repair the impeller so the pump could be in service temporarily until a new impeller could be obtained. A stainless steel impeller hub was fabricated then pressed and bolted to the impeller body. The impeller vanes were repaired, the bore machined, the inlet neck machined and a stainless steel wear ring manufactured and installed. After the impeller was balanced and coated with a ceramic epoxy, new bearings and a mechanical seal were installed. The job was completed in only 3 weeks.
Hydro received this same pump for normal overhaul five years after this temporary solution was implemented and learned that the work done in the previous repair allowed the station to continue to produce over 25 million gallons a day at full speed for those five years.