Ingersoll Rand Descaling
Application: Descaling for a Hot Mill
Pump Details: Ingersoll Rand 6x11 DAH
Pump Type: Multi-Stage Horizontal Split Case
After a recent repair, a hot mill's descaling pump failed just 12 hours into operation. The hardness of the wear ring, greater than that of the impeller, caused the wear ring to act as a cutting tool - slicing into the impeller shrouds and causing the impellers to break apart. This catastrophic failure caused severe damage throughout the pump.The mill sent the 10-stage pump to the OEM for evaluation, then contacted Hydro for a second opinion. Hydro's inspection revealed several details of the failure, including excessive damage to the shroud contact, casing, and shaft. The back hub impeller rings on most of the impellers were destroyed and missing.
Hydro eliminated the wear rings on the impellers by welding the impeller shrouds and machining them to make up the dimensional difference the wear rings would otherwise provide. This design upgrade will increase the pump's run life and reduce the time and costs associated with maintenance required to replace the wear rings.
The pump was repaired and ready for shipment back to the mill after only 8 weeks in Hydro's shop. The pump was started up over a month ago and is running very well.