PSI - Issue 16

Borys Paton et al. / Procedia Structural Integrity 16 (2019) 176–183

183

Borys Paton et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 6 shows the diagram of monitored pipeline runs with marked locations of higher AE activity. Green squares show sections, in which the company performed scheduled NDT and no defects were found (dark-green – 2013, light-green – 2009). Yellow and orange ellipses of different intensity show sections of higher acoustic activity, for which the system generated warnings of level 1 and 2 , in keeping with the table. Note that the detected potentially dangerous sections include difficult-of-access ones, where inspection performance by other methods requires serious amount of time. This again confirms the correctness of AE method selection for continuous monitoring of industrial overheating pipelines. Additional effectiveness of monitoring system operation is achieved also by capability of remote access through the Internet. Positive experience has been accumulated (Paton at al. (2012)) of authors’ supervision by specialists of the E.O. Paton Electric Welding Institute of NASU based on continuous AE monitoring results, creation of integrating information systems, combining the results of monitoring different facilities on one display and performing their joint analysis. At present all the required instrumentation, program and organizational tools are available for fitting power sector equipment with systems of continuous AE monitoring, and their application is a source of ensuring safe operation and improvement of enterprise operation profitability. The system of continuous AE monitoring of pipelines of hot industrial steam overheating in power unit #1 at Kiev TPP-6 has been developed and put into trial operation. Acoustic properties of steam pipeline materials were studied. Preliminary high-temperature AE studies of steam pipeline material were conducted. Developed procedure allows determination of structure material breaking load, based on AE data, under actual operating conditions of the structure at any moment of time, irrespective of operating time volume or temperature variations. Breaking load predicted by continuous AE monitoring system is determined with accuracy sufficient for practical purposes. To ensure the time margin when taking the decision on the monitored facility state, safety factors were established for the predicted breaking load, which are automatically determined by the monitoring system, depending on the degree of danger of the destructive processes developing in the material. Monitoring schematic and features of practical application of monitoring system are presented. Applied procedure and technology allow determination of the coordinates of monitored facility section with minimum breaking load magnitude. Remote access allows performance of author’s supervision of system operation through the Internet. Beresina, T.G., Bugaj, N.V., Trunin, I.I., 1991. Diagnostics and prediction of metal fatigue life in thermal power plants. Tekhnika, Kyiv, pp. 120. Beveridge, A., Ham, B., Rosenbrock, L., Kriesl, N., 2009. Acoustic emission monitoring of high energy piping. IIW annual assembly and international conference, Singapore, 12 – 18 July, XI – 928 – 09. Lebedev, A.A., Chausov, N.G., Nedoseka, S.A., Boginich, I.O., 1995. Model of damage accumulation in metallic materials at static tension. Problemy Prochnosti 7, 31 – 40. Lobanov, L.M., Nedoseka, A.Ya,, Tsaryuk, A.K., Gruzd, A.A., Harchenko, L.F., Yaremenko, M.A., 2009. Investigation of AE characteristics of materials at high temperatures. Information 2. Procedure. Tekhnicheskaya Diagnostika i Nerazrushayushchiy Kontrol 4, 5 – 13. Nedoseka, S.A., 2007. Prediction of fracture by acoustic emission data. Tekhnicheskaya Diagnostika i Nerazrushayushchiy Kontrol 2, 3 – 9. Nedoseka, A.Ya., 2008. Fundamentals of calculation and diagnostics of welded structures. Ed. B. E. Paton. Indprom, Kyiv, pp. 812. Nedoseka, A.Ya., Nedoseka, S.A., Gruzd, A.A., Yaremenko, M.A., Harchenko, L.F., Voloshkevich, I.G., 2011. Investigation of AE characteristics of 12Cr18Ni10Ti steel at 560°C temperature. Information 1. Procedure and some results. Tekhnicheskaya Diagnos tika i Nerazrushayushchiy Kontrol 1, 13 – 19. Nedoseka, S.A., Ovsienko, M.A., 2012. Features of processing acoustic emission data for complex and multiple location antennas. Tekhnicheskaya Diagnostika i Nerazrushayushchiy Kontrol 2, 7 – 12. Paton, B.E., Lobanov, L.M., Nedoseka, A.Ya., Nedoseka, S.A., Yaremenko, M.A., 2012. Acoustic emission and structure residual life: Theory, methods, technology, means, application. Indprom, Kyiv, pp. 312. 3. Conclusions References