The continuous annealing process line at a steel works was experiencing unplanned downtime which was, on average, 17 hours per year at a cost of $23,488 per hour. Stoppages required hiring of heavy lifting gear and increased maintenance personnel. NSK engineers performed analysis on the failed bearings and identified that both the bearing type and the sealing arrangement were inadequate for the application. The high load and low speed were major factors and the application of the multi row sealed cylindrical roller bearing (Crane Sheave) was an ideal solution.
|Before||Cost p.a.||NSK Solution||Cost p.a.|
|Lost production costs: more than 119 hours over 7 years due to bearing failure.
Annual downtime: 17 hours × $23,488
|$399,296||No lost production: Bearings in full operationing condition after 3 years in service.
Expected life time of the new NSK design: 5 years