scholarly journals Influence of thermal-varying material properties on stress calculation for creep life assessment of seamless medium-carbon steel boiler tubes

2020 ◽  
Vol 844 ◽  
pp. 012029
Author(s):  
L M Castellanos-González ◽  
H Hernández Herrera ◽  
R Goytisolo Espinosa ◽  
L M Castellanos Molina ◽  
E E Vergara Verbel ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Material Properties ◽  
Medium Carbon Steel ◽  
Life Assessment ◽  
Creep Life ◽  
Medium Carbon ◽  
Stress Calculation ◽  
Boiler Tubes ◽  
Creep Life Assessment ◽  
Steel Boiler

A Case Study on the Effect of Peaked Pipe Welds on Piping Life Expectancy

2010 ◽  
Author(s):  
Warren Brown ◽  
Martin Prager ◽  
Sarah Wrobel
Keyword(s):  
Material Properties ◽  
Life Assessment ◽  
Piping System ◽  
Creep Life ◽  
Element Analysis ◽  
Omega Method ◽  
Detailed Assessment ◽  
Creep Life Assessment ◽  
Pipe Geometry

This paper details a case study on the effect of weld peak geometry on the expected creep life of a piping system operating in a refining environment. Inspection of the 1-1/4 Cr piping system revealed significant peaked geometry at the longitudinal weld locations. A Finite Element Analysis (FEA) assessment of the remaining life was made using the Omega method of creep life assessment. The sensitivity of the results to modeled pipe geometry and assumed material properties was assessed. The variability of life prediction that was obtained indicated a necessity to perform further more detailed assessment of the pipe geometry and material properties by the removal of samples at the weld locations. The improvement obtained in the assessment accuracy and final life predictions from the sample analysis is presented in the paper and practical implications on the operation of the piping system are detailed. Suggestions and cautions for the practical assessment of similar peaked pipe problems are also discussed.

scholarly journals Creep Life Assessment of USC Boiler Tubes

2018 ◽  
Author(s):  
Keiji Kubushiro
Keyword(s):  
Life Assessment ◽  
Austenitic Steels ◽  
Ferritic Steels ◽  
Creep Life ◽  
Creep Tests ◽  
Life Evaluation ◽  
Boiler Tubes ◽  
Long Time ◽  
Creep Life Assessment ◽  
Short Time

CSEF (creep strength enhanced ferritic) steels and austenitic steels are widely used for USC boiler tubes. It is important to evaluate creep life of these parts because metal temperature is indeterminable in superheater and reheater tubes. Almost investigations were conducted under higher stress, short time creep tests, but the pressure for the boiler pipe and tube at actual plant were very low. It is therefore necessary to establish creep life method under long time region time test at various stresses. The purpose of this work is to establish creep life evaluation in high Cr ferritic steels and austenitic steels with long time creep ruptured data. The creep life evaluation methods are based on hardness and microstructure changes.

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