Investigation of Effective Parameters on Annealing and Hot Spotting Processes for Straightening of Bent Turbine Rotors
The most severe damage of the turbine rotor is its
distortion. The rotor straightening process must lead, at the first
stage, to removal of the stresses from the material by annealing and
next, to straightening of the plastic distortion without leaving any
stress by hot spotting. The straightening method does not produce
stress accumulations and the heating technique, developed
specifically for solid forged rotors and disks, enables to avoid local
overheating and structural changes in the material. This process also
does not leave stresses in the shaft material. An experimental study
of hot spotting is carried out on a large turbine rotor and some of the
most important effective parameters that must be considered on
annealing and hot spotting processes are investigated in this paper.
[1] E. poursaeidi, M. Salavatian, "Thermal simulation of rotor
straightening," ICME, Johor Bahru, Malaysia, 21- 23 May 2008.
[2] R. V. Gestel, "Rotor repair," International Gas Turbines, ASME,
Netherlands, No. 94-JT-351, 1994.
[3] D. Norfield, "Practical balancing of rotating machinery," First ed,
Elsevier Ltd, pp. 39, 2006.
[4] "Bowed rotor straightening," Mechanical Dynamic & Analysis LTD,
Private communication, 2011.
[5] G. S. Kim, J. E. Indacochea, and T. D. Spry, "Weldability Studies in Cr-
Mo-V Turbine Rotor Steel," Proceedings of International Symposium on
Welding Metallurgy of Structural Steels, Annual Meeting of The
Metallurgical Society, Inc, Denver, Colorado, U.S.A., pp. 79-100,
February 22-26 1987.
[6] R. E. Holt, "Primary concepts for flame bending," Welding Journal Vol.
76. pp. 416-424, 1971.
[7] C. W. Roeder, "Experimental Study of Heat Induced Deformation,"
Journal of Structural Engineering, ASCE, Vol. 112, No. 10, pp. 2247-
2262, 1986.
[8] O. Ditman, "Determination of Thermal Shrinkage in Structural Steel,"
MS Thesis, University of Washington, 1961.
[9] W. Chin, "Linear Shrinkage of Steel," MS Thesis, University of
Washington, 1962.
[10] E. poursaeidi, A. R. Razavi, "The causes of local hardness increasing in
power plant rotors and its modification by tempering," IJE Trans. Vol.
21, No. 3, pp. 267-274. 2008.
[11] H. P. Bloch, and F. K. Geitner, "Machinery Component Maintenance
and Repair," Gulf Publishing Co, 3rd ed, Elsevier, pp. 476-479, 1999.
[12] "Heat Treating," Vol. 4, ASM Handbook, 1991.
[13] G. E. Thotten, and A. H. Howes, "Steels Heat Treatment Handbook,"
U.S.A. International Pub, pp.648-652, 1997.
[14] C. R. Brooks, "Principles of the Heat Treatment of Plain Carbon and
Alloy Steels," The University of Tennessee, Knoxville, ASM
International, pp. 162-164, 1996.
[15] G. T. Jones, and J. Gunning, "Causes for and Methods of Straightening
Bent Turbine Rotors," ERA Technology, U.K., private communication,
1988.
[16] E. poursaeidi, A. R. Razavi, "An investigation on the causes of rotor
bending and its thermal straightening," IJE Trans. Vol. 21, No. 3, pp.
281-290. 2008.
[1] E. poursaeidi, M. Salavatian, "Thermal simulation of rotor
straightening," ICME, Johor Bahru, Malaysia, 21- 23 May 2008.
[2] R. V. Gestel, "Rotor repair," International Gas Turbines, ASME,
Netherlands, No. 94-JT-351, 1994.
[3] D. Norfield, "Practical balancing of rotating machinery," First ed,
Elsevier Ltd, pp. 39, 2006.
[4] "Bowed rotor straightening," Mechanical Dynamic & Analysis LTD,
Private communication, 2011.
[5] G. S. Kim, J. E. Indacochea, and T. D. Spry, "Weldability Studies in Cr-
Mo-V Turbine Rotor Steel," Proceedings of International Symposium on
Welding Metallurgy of Structural Steels, Annual Meeting of The
Metallurgical Society, Inc, Denver, Colorado, U.S.A., pp. 79-100,
February 22-26 1987.
[6] R. E. Holt, "Primary concepts for flame bending," Welding Journal Vol.
76. pp. 416-424, 1971.
[7] C. W. Roeder, "Experimental Study of Heat Induced Deformation,"
Journal of Structural Engineering, ASCE, Vol. 112, No. 10, pp. 2247-
2262, 1986.
[8] O. Ditman, "Determination of Thermal Shrinkage in Structural Steel,"
MS Thesis, University of Washington, 1961.
[9] W. Chin, "Linear Shrinkage of Steel," MS Thesis, University of
Washington, 1962.
[10] E. poursaeidi, A. R. Razavi, "The causes of local hardness increasing in
power plant rotors and its modification by tempering," IJE Trans. Vol.
21, No. 3, pp. 267-274. 2008.
[11] H. P. Bloch, and F. K. Geitner, "Machinery Component Maintenance
and Repair," Gulf Publishing Co, 3rd ed, Elsevier, pp. 476-479, 1999.
[12] "Heat Treating," Vol. 4, ASM Handbook, 1991.
[13] G. E. Thotten, and A. H. Howes, "Steels Heat Treatment Handbook,"
U.S.A. International Pub, pp.648-652, 1997.
[14] C. R. Brooks, "Principles of the Heat Treatment of Plain Carbon and
Alloy Steels," The University of Tennessee, Knoxville, ASM
International, pp. 162-164, 1996.
[15] G. T. Jones, and J. Gunning, "Causes for and Methods of Straightening
Bent Turbine Rotors," ERA Technology, U.K., private communication,
1988.
[16] E. poursaeidi, A. R. Razavi, "An investigation on the causes of rotor
bending and its thermal straightening," IJE Trans. Vol. 21, No. 3, pp.
281-290. 2008.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:53134", author = "Esmaeil Poursaeidi and Mostafa Kamalzadeh Yazdi and Mohammadreza Mohammadi Arhani1", title = "Investigation of Effective Parameters on Annealing and Hot Spotting Processes for Straightening of Bent Turbine Rotors", abstract = "The most severe damage of the turbine rotor is its
distortion. The rotor straightening process must lead, at the first
stage, to removal of the stresses from the material by annealing and
next, to straightening of the plastic distortion without leaving any
stress by hot spotting. The straightening method does not produce
stress accumulations and the heating technique, developed
specifically for solid forged rotors and disks, enables to avoid local
overheating and structural changes in the material. This process also
does not leave stresses in the shaft material. An experimental study
of hot spotting is carried out on a large turbine rotor and some of the
most important effective parameters that must be considered on
annealing and hot spotting processes are investigated in this paper.", keywords = "Annealing, Hot Spotting, Effective Parameter, Rotor", volume = "5", number = "7", pages = "1256-6", }