Centrifugal fans used in power generation applications are subjected to abrasive environments. After sufficient time in service, the wearing surfaces of fans require repair or replacement. In planning for and performing weld repairs to these wearing surfaces, there are several important considerations. First, the wear must be found, quantified, and an estimate made of the remaining useful life of the wearing surface. Then, the extent of the repairs and nature of repairs should be determined. Finally, a thorough repair plan should be made and a repair technique developed prior to starting the work. This article will discuss practical methods of working through these steps toward a successful repair.
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