Abstract
Introduction. Changes of metal structure commonly result in equipment failures; early recognition of such changes is necessary in order to prevent emergency situations. Coercimetry is a simple and informative method for metal structure estimation.
 Method. The coercive force measurement method was used for estimation of the metal fatigue state.
 Results. The article presents the results of coercive force measurement application for the diagnosis of blast furnace jackets, overhead cranes, load-bearing elements of buildings and structures, pressure vessels, industrial pipelines, chimney stacks, ropes of hoisting devices. Manual testing of the equipment working under metallurgical production conditions is complicated; in hard-to-reach places and gas hazardous areas the stationary testing system has been used; the system has included permanently installed sensors connected to the switchboard. The equipment residual life has been determined by the coercive force maximum values with the use of nomograms.
 Conclusions. The coercive force measurement method for diagnostic survey of the equipment working under considerable thermal effect makes it possible to determine the metal stress state, predict zones of corrosion cracks formation and development, estimate the residual operation life, plan worn areas replacement/repair and as the final result – reduce unplanned and emergency shutdowns.
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