Nondestructive Evaluation Steel Bolts and Studs Tightening Effort in Casing Power Plant Equipment using the Metal Strain Indicator IN-01m

摘要

To provide steel bolts and studs tightening effort nondestructive evaluation the metal strain indicator IN-01m have been developed based on residual magnetic field dependence of metal strain value described. IN-01m can be used either before or during tightening steel bolts and studs, provide in-time detection of internal damage of metal, and there are no any strict limitations similar to applied in ultrasonic and other strain evaluation techniques. The results of hydro turbine cover steel studs inspection produced by IN-01m in the time of maintenance in turbine hall of power plant are presented.