Application of Non-destructive Testing Methods to Diagnostics and Repair of Elements of Thermo-energy Systems

نویسندگان

  • M. Vončina
  • J. Grum
چکیده

The paper treats the application of various non-destructive testing methods to preventive examinations of vital elements of thermo-energy systems operating at elevated temperatures and pressures. The elevated pressures and temperatures produce thermal stresses in the material of a device, i.e. a system, which may result in material creep. On the occasion of a preventive inspection of a steam line some critical flaws were detected. They could easily result in a failure of an element of the device if the system continued to operate. In a visual examination of the link pipeline between two stages of a steam reheater cracks were detected at the surface of the pipeline close to a drillhole for the tube attachment supplying cold water. The presence of such cracks at the steam reheater not being admissible, repair of the pipe was required. The location of the cracks detected had to be confirmed additionally by other methods so that the location and extent of damage and repair could be determined. Based on non-destructive testing performed it was decided to remove the tube attachment supplying cold water to the system. The surface was examined with liquid penetrants. The metallographic replicas taken made it possible to determine the extent of damage to the material. Based on additional non-destructive testing a decision was taken concerning the extent and method of repair. It was decided to locally repair the area of the tube attachment by first grinding and then surfacing the crack area. After welding the welded joint obtained was thermally treated, the state of the material surface was visually examined, and the welded area and its surroundings were additionally examined with liquid penetrants.

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تاریخ انتشار 2005