Boresonics Inspection of Steam Turbine and Generator Rotors
A boresonic examination of a rotor bore consists of introducing sound beams into the rotor material from the surface of the bore to detect reflectors which represent flaws in the rotor volume.
Overall the process involves moving the appropriate ultrasonic search units through the length of the rotor bore and recording the observed specular reflectors emanating from flaw facets or boundaries. This is accomplished with a motorized scanner that moves the ultrasonic search units through the length of the rotor bore. The ultrasonic search units are coupled to the bore by direct contact using oil or a similar liquid as an acoustic couplant.
The data acquisition system then records the presence of ultrasonic reflectors in the rotor material in a format that allows for calculating the distance along the bore, radial distance from the bore surface, angular location, as well as the signal amplitude of the reflector. Flaw registration is thus accomplished using an amplitude based detection method. A map of these reflector locations is plotted to define the overall distribution of flaw data detected in the rotor.
The objective is to detect, locate, and size flaws that have the potential for affecting the integrity of the rotor. This information can then be used in an engineering analysis to determine if the flaw is critical to the reliability of the rotor.
3angles boresonics inspection program consists off:
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