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leak detection in pressurized piping by pattern recognition techniques
ND T Abstracts 40934 Chan, R.W.Y.; Hay, D.R.; Hay, J.R.; Patel, H,B. Improving acoustic emission crack/icak detection in pressurized piping by pattern recognition techniques Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23-28 Apr. 1989, Vol. 1, pp. 851-853. Edited by J. Boogasrd and G.M. van Dijk, Elsevier, 1989 P~teru classification techniques were applied to metal-borne acoustic emission (AE) from natural leaks and simulated cracks in carbon-steel pipes, and acoustic background from similar heat transport piping at a CANDU nuclear station. Results indicate that while AE crack detection in _heJ~te__zpipes is not promising, use of pattern recognition techniques in AE leak monitoring may reduce false alarms and provide 6 to 12 dB higher noise immunity.
40928 Sarkimo, M. Acoustic emission monitoring of large vessel at pressurization until r u p t u r e Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23-28 Apr. 1989, Vol. 1, pp. 490-495. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 The main task of a four-year research programme in the area of elasticplastic fracture mechanics is to assess the leak-before-break (LBB) criteria for pressure vessels and piping. The major experimental effort is the pressurization until rupture of a large pressure vessel having dimensions resembling those of a nuclear reactor pressure vessel Before pressurization an artificial flaw was made using a special technique on the inner wall of the vessel. The versatile insu~mentution used in the test included also multichannel acoustic emission. AE-instrumentation coveted the entire vessel like in a real pressure vessel test, A special sensor group was used in the area of the artificial flaw to monitor it more closely. Data analysis of the AE-system is based on the localization of the AE-events. The results of the AE-test are reported and compared with results from othex instrumentation and fracture behavior.
Scheerder, A.A.S,; Sluyter, E.A.; Boogaard, J.; van den Hooff, H. 40927
Acoustic emission detectability of fatigue cracks in high strength low alloy steel plate during quasi static loading Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23-28 Apr. 1989, Vol. 1, pp. 484-489. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 In this contribution results obtained from acoustic emission (AE) experiments on High Strength Low Alloy steels (HSLA-steeis) will be reported. The objective of this study was to get a better insight into the applicability of the AE technique for determining the structural integrity of large metallic constructions like pressure vessels (storage tanks). The test results indicate that the AE detectability of defects in all investigated HSLA-steei plate was very poor except for one material. Subsequent microscopic examination of the micmstructure and the fracture surfaces showed that differences in morphology of brittle phases in combination with the applied stress condition most likely account for the differences in AE behaviour.
40740 Hutton, P J-I.; Friesel, MA.; Dawson, J.F.; Harris, J.C. Acoustic emission system calibration at Watts Bar Unit 1 nuclear reactor Nuclear Regulatory Commission, Washington, (United States), NUREG CR- 5144, 32 pp. (Aug. 1988) An acoustic emission system has been installed on Tennessee Valley Authority TVA's Watts Bar Unit I reactor to monitor selected areas of the pressure boundary during cold hydrostatic testing, hot functional testing, and ultimately, during reactor startup and operation. This is part of a
cooperative effort between TVA and NRC Research to test and demonstrate AE technology. This technology has been developed under an NRC Research program to validate the application of AE techniques for continuous, on-line monitoring of reactor pressure boundaries to detect cracking. This report discusses the performance of and results from a special calibration test of the AE system using simulated AE signals to evaluate the accuracy of signal source location by the system. 40536 Roger,J. Acoustic emission: valuable applications and future trends Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 3083-3092. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 Since Kaiser's Investigations in the 1950's, a lot of technical and
scientific work have been ran'led out on Acoustic Emission (AE). Since the beginning of the 80's, the improvements in instrumentation, the development of new materials, composites, for which the usual NDE methods are not so suitable and also a more realistic idea of AE possibilities, are some of the reasons why there is an increasing interest in AE. This paper is a status review of the most important applications of AE in indusl3V. pressure vessel inspection during proof testing. Non-Destructive Examination of compmite structures, structural testing, leak detection, On-line monitoring, and Process monitoring. In the second part of the paper future trends for AE are reviewed, analysing successively the needs of Operators,Equipment, Theory and Applications.
40526 Tonolini, F. Application of acoustic emission to condition monitoring Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 2951-2960. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 In applying acoustic emission (AE) technology to condition monitoring, both the phenomena producing AE in the materials and the acoustic background noise present during plant and structure operation, are analyzed. The main perfommnce and reliability characteristics of the instrumentation used for continous monitoring in hostile environments are outlined. Experience accumulated on real structmes is described and the main results are reported. AE examinations during hydrotnsts of pressure vessels in pre-service and in,service inspection are considered. Particular attention is paid to problems related tu AE continuous monitoring. Experimental activity carried out on reduced scale structures during fatigue tests (pressure vessels, offshore nodes), loading up to failure (steel vessels, fiber glass pipes, concrete beams) and stress corrosion (stainless steel pipes) is discussed. Finally the results obtained in leak monitoring on power plants are reported.
40525 Tirbonod, B.; Hanacek, L. Some properties of acoustic emission signals measured in the vicinity of a crack during the cyclic pressure loading of a vessel Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 2943-2950. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 Recurrent signals were measured during the cyclic pressure loading of a vessel and classed according to their form and the location of their source. The positions of the s o u r ~ are distributed about the crack. A few properties of certain classes of signals are reported.
40524 Mihovsky, M.; Lozev, M.; Takov, T.; Bojinov, K. Problems of the acoustic emission testing in the chemical machine building industry Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 2935-2942. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 Some problems are reviewed in this paper, that should be resolved when applying acoustic emission testing as a nondestructive method during the f'wst hydrotest of pressure vessels, manufactured in the chemical machine building industry. Ways of reducing exrors in the location determination of acoustic emission sources are suggested. Some methods for investigating and specifying the connection between acoustic emission parameters and processes of fracture in the vessels are described. Some results from solving the practical problems of the acoustic emission testing of apparatus in the chemical and petrochemical industries are given. 40523 Jax, P.; Streicher, V.; Leuker, W. AE-Inspection of nuclear components-state of the art including recent results Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 2926-2934. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 Acoustic emission tests on nuclear components with high safety standards (reactor pressure vessels, primary and secondary piping systems) have been performed in Germany since 1973, most of them under the responsibility of Kraftwerk Union, (KWU). These tests on real components and systems were accompanied by a series of research programs, either NDT&E
International Volume
26 Number
6 1993
321
40928 Sarkimo, M. Acoustic emission monitoring of large vessel at pressurization until r u p t u r e Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23-28 Apr. 1989, Vol. 1, pp. 490-495. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 The main task of a four-year research programme in the area of elasticplastic fracture mechanics is to assess the leak-before-break (LBB) criteria for pressure vessels and piping. The major experimental effort is the pressurization until rupture of a large pressure vessel having dimensions resembling those of a nuclear reactor pressure vessel Before pressurization an artificial flaw was made using a special technique on the inner wall of the vessel. The versatile insu~mentution used in the test included also multichannel acoustic emission. AE-instrumentation coveted the entire vessel like in a real pressure vessel test, A special sensor group was used in the area of the artificial flaw to monitor it more closely. Data analysis of the AE-system is based on the localization of the AE-events. The results of the AE-test are reported and compared with results from othex instrumentation and fracture behavior.
Scheerder, A.A.S,; Sluyter, E.A.; Boogaard, J.; van den Hooff, H. 40927
Acoustic emission detectability of fatigue cracks in high strength low alloy steel plate during quasi static loading Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23-28 Apr. 1989, Vol. 1, pp. 484-489. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989 In this contribution results obtained from acoustic emission (AE) experiments on High Strength Low Alloy steels (HSLA-steeis) will be reported. The objective of this study was to get a better insight into the applicability of the AE technique for determining the structural integrity of large metallic constructions like pressure vessels (storage tanks). The test results indicate that the AE detectability of defects in all investigated HSLA-steei plate was very poor except for one material. Subsequent microscopic examination of the micmstructure and the fracture surfaces showed that differences in morphology of brittle phases in combination with the applied stress condition most likely account for the differences in AE behaviour.
40740 Hutton, P J-I.; Friesel, MA.; Dawson, J.F.; Harris, J.C. Acoustic emission system calibration at Watts Bar Unit 1 nuclear reactor Nuclear Regulatory Commission, Washington, (United States), NUREG CR- 5144, 32 pp. (Aug. 1988) An acoustic emission system has been installed on Tennessee Valley Authority TVA's Watts Bar Unit I reactor to monitor selected areas of the pressure boundary during cold hydrostatic testing, hot functional testing, and ultimately, during reactor startup and operation. This is part of a
cooperative effort between TVA and NRC Research to test and demonstrate AE technology. This technology has been developed under an NRC Research program to validate the application of AE techniques for continuous, on-line monitoring of reactor pressure boundaries to detect cracking. This report discusses the performance of and results from a special calibration test of the AE system using simulated AE signals to evaluate the accuracy of signal source location by the system. 40536 Roger,J. Acoustic emission: valuable applications and future trends Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 3083-3092. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 Since Kaiser's Investigations in the 1950's, a lot of technical and
scientific work have been ran'led out on Acoustic Emission (AE). Since the beginning of the 80's, the improvements in instrumentation, the development of new materials, composites, for which the usual NDE methods are not so suitable and also a more realistic idea of AE possibilities, are some of the reasons why there is an increasing interest in AE. This paper is a status review of the most important applications of AE in indusl3V. pressure vessel inspection during proof testing. Non-Destructive Examination of compmite structures, structural testing, leak detection, On-line monitoring, and Process monitoring. In the second part of the paper future trends for AE are reviewed, analysing successively the needs of Operators,Equipment, Theory and Applications.
40526 Tonolini, F. Application of acoustic emission to condition monitoring Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 2951-2960. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 In applying acoustic emission (AE) technology to condition monitoring, both the phenomena producing AE in the materials and the acoustic background noise present during plant and structure operation, are analyzed. The main perfommnce and reliability characteristics of the instrumentation used for continous monitoring in hostile environments are outlined. Experience accumulated on real structmes is described and the main results are reported. AE examinations during hydrotnsts of pressure vessels in pre-service and in,service inspection are considered. Particular attention is paid to problems related tu AE continuous monitoring. Experimental activity carried out on reduced scale structures during fatigue tests (pressure vessels, offshore nodes), loading up to failure (steel vessels, fiber glass pipes, concrete beams) and stress corrosion (stainless steel pipes) is discussed. Finally the results obtained in leak monitoring on power plants are reported.
40525 Tirbonod, B.; Hanacek, L. Some properties of acoustic emission signals measured in the vicinity of a crack during the cyclic pressure loading of a vessel Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 2943-2950. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 Recurrent signals were measured during the cyclic pressure loading of a vessel and classed according to their form and the location of their source. The positions of the s o u r ~ are distributed about the crack. A few properties of certain classes of signals are reported.
40524 Mihovsky, M.; Lozev, M.; Takov, T.; Bojinov, K. Problems of the acoustic emission testing in the chemical machine building industry Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 2935-2942. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 Some problems are reviewed in this paper, that should be resolved when applying acoustic emission testing as a nondestructive method during the f'wst hydrotest of pressure vessels, manufactured in the chemical machine building industry. Ways of reducing exrors in the location determination of acoustic emission sources are suggested. Some methods for investigating and specifying the connection between acoustic emission parameters and processes of fracture in the vessels are described. Some results from solving the practical problems of the acoustic emission testing of apparatus in the chemical and petrochemical industries are given. 40523 Jax, P.; Streicher, V.; Leuker, W. AE-Inspection of nuclear components-state of the art including recent results Proceedings of the 16th European Working Group on Acoustic Emission Conference, London (United Kingdom), 13-18 Sep. 1987, pp. 2926-2934. Edited by C.B. Scruby and R. Hill, Proceedings of the 4th European Conference on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987, Vol. 4, Pergamon Press, 1988 Acoustic emission tests on nuclear components with high safety standards (reactor pressure vessels, primary and secondary piping systems) have been performed in Germany since 1973, most of them under the responsibility of Kraftwerk Union, (KWU). These tests on real components and systems were accompanied by a series of research programs, either NDT&E
International Volume
26 Number
6 1993
321