RADIOACTIVE TRACER TECHNIQUE ON HEAT EXCHANGER

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RADIOACTIVE TRACER TECHNIQUE ON HEAT EXCHANGER

  1. 1. OUTLINE INTRODUCTION RADIO TRACER HEAT EXCHANGER TYPES OF HEAT EXCHANGER PRINCIPLE OF RADIOTRACER TECHNIQUE ON HEAT EXCHANGER SCOPE OF RADIOTRACER TECHNIQUE RISK INVOVLVED RADIATION SAFETY ASPECTS SELECTION OF RADIOTRACER ADVANTAGES CONCLUSION
  2. 2. What are Heat Exchangers
  3. 3. DAMAGES IN HEAT EXCHANGERS
  4. 4. NDT TECHNIQUES INVOLVE IN INSPECTION OF HEAT EXCHANGER Radiotracer Technique Acoustic Emission Test Eddy Current Testing Ultrasound Testing Sampling Testing Chemical Tracer Testing
  5. 5. PRINCIPLE OF RADIOTRACER TECHNIQUE ON HEAT EXCHANGER • Radioisotopes is injected as a sharp pulse into the higher pressure process stream entering the heat exchanger. • The inlet detector mounted at the tube side inlet (high pressure) monitors the injection peak and time. • The leak detector (output detector) mounted at the shell outlet (low pressure) detects radiotracer infiltrated into the lower pressure from higher pressure side showing the presence of a leak (if any).
  6. 6. • Any leakage throughout the high pressure tube side could be indicated by a subsidiary peak (so called bypass peak ) preceding the main peak. • The main peak represents the flow pattern of the fluid flowing from inlet to outlet in normal way, while the subsidiary peak represents the leak because it goes in abnormal way by passing the normal flow.
  7. 7. SCOPE OF RADIOTRACER TECHNIQUE • The procedure shall be applicable to the inspection of all types of Heat Exchanger and Pipeline systems in industrial process plants using radiotracer techniques. The scope of radiotracers is expanding because it is relatively easy and can detect faults while the plant is still online.
  8. 8. RISK INVOVLVED USING RADIOTRACER TECHNIQUE ON HEAT EXCHANGER • • • • Thyroid cancer Damages DNA Birth defects Bone marrow cancer
  9. 9. RADIATION SAFETY ASPECTS All necessary radiation protection aspects were taken into account during all stages of the experiment (radioisotope production, transportation, injection, etc ) Nobody except PINSTECH personnel was allowed to stay within 10 meters diameter around the injection port during tracer injection till the area was checked at the end of experiment.
  10. 10. SELECTION OF RADIOTRACER Selection of a suitable radiotracer is very important for the success of the leak detection test. Most of the radiotracers used in industral tracers experiments are gamma emitting tracers. The energy of the gamma radiation should be sufficiently high to penetrate through the wall of pipes or vessels.
  11. 11. SELECTION OF RADIOTRACER The following parameters should be considered in the selection of a radiotracer. The tracer should be the same as the fluid being traced. The half life of the radioisotope should be comparable to the duration of the experiment .
  12. 12. ADVANTAGES • • • • • • High Sensitivity Quick Analysis Availability of wide range of Compatible Radiotracer Use for Leak Detection and for Blockage Detection Corrosion Monitoring Port Management
  13. 13. CONCLUSION From the forgoing it is evident that radiotracer techniques are well established and widely used for detection of blockages and leaks in different systems, residence lime distribution investigation, mixing studies, corrosion measurement, efficient management of oil wells, and management of ports. In most of the situation they do not have any equivalent and competing alternatives. High economic benefits are achieved from the application of the radiotracer techniques to leak detection and location.
  14. 14. COMPILED BY BILAL AHMED REG # 2012086 Material Sciences And Engineering (Manufacturing) GIK Institute Of Engineering And Sciences Topi, Pakistan
  15. 15. REFERENCES • IAEA, 1990, “Guidebook on Radioisotope Tracers in Industry”, TECH. Report Series No 316, Vienna. • CHARLTON, J.S; (Ed), 1986, “Radioisotope Techniques for Problem-Solving in Industrial Process Plants”.
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