Non-destructive measurement and role of surface residual stress monitoring in residual life assessment of a steam turbine blading material

2014 ◽  
Author(s):  
Gajanana Prabhu-Gaunkar ◽  
M. S. Rawat ◽  
C. R. Prasad
Keyword(s):  
Residual Stress ◽  
Residual Life ◽  
Life Assessment ◽  
Stress Monitoring ◽  
Surface Residual Stress ◽  
Residual Life Assessment ◽  
Destructive Measurement ◽  
Non Destructive ◽  
Turbine Blading

Residual Life Assessment and Life Cycle Management of Design Life Expired Discs

2009 ◽  
Author(s):  
Ashok Koul ◽  
Ajay Tiku ◽  
Karan Khullar ◽  
Jun Zhao
Keyword(s):  
Residual Life ◽  
Life Cycle Management ◽  
Life Assessment ◽  
Operational Environment ◽  
Design Life ◽  
Metallurgical Analysis ◽  
Safety And Reliability ◽  
Residual Life Assessment ◽  
Non Destructive

The results of a prognostics case study on GE Frame 5001P first stage turbine disc are presented in this paper. Currently used and promoted practices for metallurgical analysis such as hardness testing and replica based microstructural assessment and inspection of rotors for dimensional checks and cracks are not sufficient to ensure safety and reliability of the engine. The uncertainly of all engine variables including operational environment must be considered prior to returning the engine to service. It is required to accurately predict the temperature profile of the discs that can have serious consequences on the residual life assessment of the fracture prone rotors. The safe inspection interval (SII) determination of the design life expired engines and defining non-destructive inspection (NDI) sensitivity requirements for continued safe operation of the engine are equally important.

Predicting the Residual Life of Plant Equipment—Why Worry?

1985 ◽  
Vol 107 (3) ◽  
pp. 213-217 ◽  
Author(s):  
C. E. Jaske
Keyword(s):  
Life Prediction ◽  
Residual Life ◽  
Life Assessment ◽  
Case Histories ◽  
Life Estimation ◽  
Remaining Service Life ◽  
Critical Issues ◽  
Plant Equipment ◽  
Residual Life Assessment

Predicting the residual life of plant equipment that has been in service for 20 to 30 years or more is a major concern of many industries. This paper reviews the reasons for increased concern for residual-life assessment and the general procedures used in performing such assessments. Some examples and case histories illustrating procedures for assessing remaining service life are discussed. Areas where developments are needed to improve the technology for remaining-life estimation are pointed out. Then, some of the critical issues involved in residual-life assessment are identified. Finally, the future role of residual-life prediction is addressed.

Residual service life estimation of bridges

2021 ◽  
Author(s):  
Mayank Bajaj ◽  
Biswajit Bhattacharjee
Keyword(s):  
Residual Life ◽  
Concrete Bridges ◽  
Life Assessment ◽  
Residual Service Life ◽  
Chloride Ingress ◽  
Service Life Estimation ◽  
Residual Life Assessment ◽  
Existing Bridges ◽  
Residual Service

<p>While concrete structures perform well in many situations, lack of durability has emerged as a significant issue for asset owners. A review of past bridge failures was done to identify the most probable causes of bridge failures. This study has tended to focus on current models used for estimating the time to deterioration of concrete bridges instigated by Chloride ingress and Fatigue. Subsequently, mathematical modelling of the best-suited deterioration model is done to arrive at the residual life of two existing bridges. This work has highlighted high variability in the parameters used to describe the durability related properties of in-situ aged concrete. A realistic residual life assessment can be achieved by correct evaluation of these parameters by periodic testing of bridge samples</p>

Criterial relationships for residual life assessment of materials

2006 ◽  
Vol 38 (4) ◽  
pp. 348-353 ◽  
Author(s):  
A. A. Lebedev ◽  
V. M. Mikhalevich
Keyword(s):  
Residual Life ◽  
Life Assessment ◽  
Residual Life Assessment

Residual Life Assessment for Boiler Pressure Components Based on Measurements of Creep Strains

1988 ◽  
Vol 110 (3) ◽  
pp. 308-313 ◽  
Author(s):  
F. Mlynarski ◽  
J. Taler
Keyword(s):  
Residual Life ◽  
Life Assessment ◽  
Strain Measurements ◽  
Years Of Service ◽  
Residual Life Assessment ◽  
Outside Diameter ◽  
Creep Strains

This paper discusses different methods for calculating the residual life for boiler pressure components operating under creep conditions, based on tube outside diameter strain measurements. These measurements were made for over 20 yr. The methods have been applied to the residual life calculation for pipelines of 20 or more years of service. Then the results have been compared.

scholarly journals Residual Life Assessment of Electricity Pylons – A Case Study

2009 ◽  
Vol 413-414 ◽  
pp. 219-228 ◽  
Author(s):  
John R. Maguire
Keyword(s):  
Structural Integrity ◽  
Residual Life ◽  
Life Assessment ◽  
Original Design ◽  
Integrity Assessment ◽  
Specific Safety ◽  
Residual Life Assessment ◽  
Independent Assessment ◽  
Overhead Power Line

This case study describes a structural integrity assessment of a 220 kV overhead power line. The line comprises 70 pylons over a distance of approximately 30 km, predominantly in a valley location. The pylons are spaced at intervals of approximately 400 m and each pylon is approximately 32 m in height. The line was originally constructed in the 1950’s, approximately 50 years prior to the requested structural integrity assessment. This paper describes the independent assessment that was carried out. The review established site-specific safety factors at the time of original design and construction; at the time of the review (2007), accounting for the possible presence of the “Thomasstahl” steel; and in the future, at the anticipated end of pylon life (in 2012).

scholarly journals Non-Destructive Measurement of Residual Stress by Magnetostriction Effect : In the Case of Measurement by Shear Difference Method

1977 ◽  
Vol 43 (365) ◽  
pp. 65-75
Author(s):  
Akio YOSHINAGA ◽  
Tikako TAKIZAWA ◽  
Tokuharu YOSHII ◽  
Tikanori KUMAGAI ◽  
Hisatoshi YAMADA
Keyword(s):  
Residual Stress ◽  
Difference Method ◽  
Destructive Measurement ◽  
Non Destructive
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