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Non Destructive Testing For Gas Turbines


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Non destructive Testing
Gas Turbines
Destructive testing

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Non Destructive Testing For Gas Turbines

  1. 1. Civil Aviation Technology College IRAN
  2. 2. Examination of component surfaces, using special equipment such as Borescopes, and magnifying glasses.
  3. 3. The application of a coloured or fluorescent dye to detect surface breaking defects on non-porous materials.
  4. 4. Detection of flaws on or just underneath the surface of ferromagnetic materials, using fluorescent, black, or dry magnetic particles. Prods DC or AC Electro- magnet (yolk) DC or AC Crack like indicati on Crack like indicati on
  5. 5. This method uses the transmission of high-frequency sound waves through a material to detect internal defects. The pulse-echo method is the most commonly used ultrasonic testing technique. Automated and advanced ultrasonic testing methods, such as phased array and time of flight diffraction, are also used.
  6. 6. This technique generates eddy currents up to a few millimeters below the surface of a conductive material through an induced alternating magnetic field. Material defects will disturb the flow of eddy currents and generate a traceable signal.
  7. 7. Replication is used to evaluate microstructures and other surface features.
  8. 8. Radiography uses an x-ray device or radioactive isotope as a source of radiation which passes through the material and is captured on film or digital device. After processing the film an image of varying density is obtained. Possible imperfections are identified through density changes.
  9. 9. One of many advantages of cast steel for complex designed structures such as turbine components is, that defects can be repaired by welding .
  10. 10. A large variety of NDT methods are available for the condition assessment of gas turbine components. Selecting the most appropriate one depends upon:  The type of component  The type of defect  The specific situation, such as the accessibility or cleanliness of the part
  11. 11. Images for surfaces of gas turbine blades made of the ŻS6-K alloy, ordered according to the criterion of the increasing degree of the material overheating
  12. 12. General Electric MS7001FA
  13. 13. Impact damage on the leading edge S-5 stator vane White deposits on all of the effusion plates
  14. 14. mid-span sidewall cracking on first stage nozzle 1, segment 24. trailing edge of the first stage nozzles and the leading edge of the first stage buckets.
  15. 15. Manual Ultrasonic Inspection
  16. 16. UT for discs
  17. 17. UT for Shafts