International Scientific Journal


Thick walled components such as high pressure (HP) steam turbine casings operating under high parameter conditions are subjected to a complex stress state. As a result of that stress state, some parts of HP turbine casing undergo to the creep fatigue caused by the combination of thermal fatigue resulted from repeated start/stop operation and the creep which occurs during long-term operation at high temperature and high-pressure. It is well known that domestic thermal power plants have been in use over 100000 h which means that significant cost is required not only for maintenance, but often for renewal of equipment. Based on comprehensive investigation, the results of residual life assessment of one high pressure steam turbine casing, which belongs to the older turbine generation, taking into account simultaneous action of thermal fatigue and creep, are presented in this paper. Also, the critical flaw crack size of HP turbine casing is determined because this parameter has a strong influence on casing integrity and residual life. The results of residual life assessment provide not only a basis for further maintenance, but also estimated time for reparation or renewal.
PAPER REVISED: 2013-03-24
PAPER ACCEPTED: 2013-09-29
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2014, VOLUME 18, ISSUE Supplement 1, PAGES [S127 - S138]
  1. Laguarda Rodrígez, J. J., Carril, J. C., Fernandez, A. R., Valero, R. R., Aspects Of Remnant Life Assessment In Old Steam Turbines, Journal of Maritime Research, ISSN: 169 7-4840, SEECMAR, II (2005), 3, pp. 41-58
  2. Martin,R.J., Steam Turbine Management in a Changing Market, OMMI, I (December 2003), 3, pp. 1-25
  3. H. Mateiu, T. Fleşer, A. Murariu, Creep-Fatigue Interaction Assessment оf 16Мo5 Steel, Structural Integrity and Life, Vol. 10, No. 2, 2010, p. 83-88
  4. Jovičić, G., Grabulov, V., Maksimović, S., Živković, M., Jovičić, N., Bošković, G., Maksimović, K., Residual life estimation of a thermal power plant component: The high-pressure turbine housing case, Thermal Science, doi:10.2298/TSCI0904099J, 13 (2009), 4, pp. 99-106
  5. Darryl, A. R., Tilley, R. M., Life Assessment Of Critical Boiler And Turbine Components Using Epri's Creep-Fatiguepro Software, EPRI, International Conference on Advances in Power Plant Life Assessment, March 11-13, 2002, Orlando, Florida 2
  6. Šijački-Žeravčić, G. Bakić, M. Đukić, B. Anđelić,Analysis of test results of hot-water boiler as a basis for its integrity assessment (in Serbian), Structural Integrity and Life, Vol. 7, No. 2, 2007, p. 133-140
  7. Saito, K., Sakuma, A., Fukuda, M., Recent Life Assessment Technology for Existing Steam Turbines, JSME International Journal, Series B, 49 (2006), 2, pp. 192-197
  8. H. Ş. Mateiu, N. Farbaş, T. Fleşer, R. Pascu, Researches Concerning Damage State Assessment of Heat Resistant Steels Used for Power Plant Components, Structural Integrity and Life, Vol. 3, No. 2, 2003, p. 51-64
  9. Sijacki, V., Bakic, G., Đukić, M., Rajičić, B., Sedmak, A., et al, Evaluation of microstructural degradation, metal damage and remaining life assessment of thermal power plant components of Electric Power Industry of Serbia (Procedure and application), Int.Rep.EPS, Fac. of Mech. Eng. Un. of Belgrade, 2008, 309p.
  10. G. Bakić, V. Šijački-Žeravčić, Determination of Time-to-Fracture of Low Alloyed Steels Under Creep Conditions as a Function of Microstructural Parameters, Structural Integrity and Life, Vol. 3, No. 1, 2003, p. 23-30
  11. Sedmak, A., Sedmak, S., Critical crack assessment procedure for high pressure steam turbine rotors. Fatigue and Fracture of Engineering Materials and Structures, 18 (1995), 9, pp. 923-934
  12. Sedmak, A., Sedmak, S.A. Evaluation of the residual life of steam turbine rotors. Materials Science, 31 (1995), 1, pp.64-72
  13. ***, Oppredelennie sroka sluzbi turbini K-200, Internal report , LMZ Leningrad, 1989
  14. Kostjuk, A.G., Metodika raschota delgovecnosti parovyh turbin na etapah proektirovania i eksploatacii, Internal report, Moskva, 1989
  15. Ancelet, O., Chapuliot, S., Henaff, G., Experimental and numerical study of crack initiation and propagation under a 3D thermal fatigue loading in a welded structure, International Journal of Fatigue, 30 (2008), 6, pp. 953-966
  16. Mukhopadhyay, N.K., Dutta, B.K., Kushwaha, H.S., On-line fatigue-creep monitoring system for high-temperature components of power plants, International Journal of Fatigue, 23 (2001), pp. 549-560
  17. *** TRD 508, Inspection and testing, with Annex 1: Additional tests on components - Methods for the calculation of components having time-dependent design strength values, Edition July 1986
  18. Bakic, G., Sijacki, V., Đukic, M., Maksimović, S., Plesinac, D., Rajicic, B., Thermal History and Stress State of a Fresh Steam-Pipeline Influencing Its Remaining Service Life, Thermal Science, 15 (2011), 3, pp. 691-704
  19. Bakic, G., Sijacki, V., Đukic, M., Maksimović, S., Plesinac, D., Rajicic, B., Anđelić, B., 1.25Cr1Mo0.3V Steel Properties Responsible For Reliable High Temperature Application, Int. Conf. Power Plants 2012, Zlatibor, Serbia, E2012-042, printed on CD
  20. G. Bakić, V. Šijački-Žeravčić, Second Part: Determination of time-to-fracture, Structural Integrity and Life, Vol. 3, No. 2, 2003, p. 85-92
  21. TRD 300, Festigkeits berechnung von Dampfkesseln. Technische Regeln für Dampfkessel, Berechnung. FassungMärz 1996.

© 2023 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence