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The Cement Institute

The process of evaluating and monitoring the level of wear on girth gearing system

The major effects of wear on girth gearing include increased vibration, increased noise, loss of efficiency, reduced load carrying capacity, high localized stresses, cracking, and catastrophic tooth failure. ​ To prevent wear in gearing, solutions include visual inspection of lubricant spray patterns and level, working with a reputable lubricant supplier, realigning the gearing to the manufacturer’s specifications, reducing load and/or speed variations, performing an Elastrohydrodynamic (EHD) analysis, preventing the ingress of contaminants, and reviewing the gearing design and rating. ​ Tooth wear can be assessed and monitored through visual inspection, infrared temperature measurements, straight edge test, tooth caliper measurements, CAD plots of the original tooth form, tooth molds, and oil sample analysis. ​ The types of wear typically observed on girth gear and pinion teeth include adhesion, abrasion, scaling, polishing, corrosion, rippling, cavitation, erosion, electrical discharge, and fretting corrosion. ​ Precautions should be taken to minimize thermal loads on the gear, such as ensuring adequate lubrication, proper alignment, allowing for thermal expansion, and regular inspections and maintenance.

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