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.
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ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
July 18–22, 2010
Bellevue, Washington, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4922-4
PROCEEDINGS PAPER
A Case Study on the Effect of Peaked Pipe Welds on Piping Life Expectancy Available to Purchase
Warren Brown,
Warren Brown
The Equity Engineering Group, Shaker Heights, OH
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Martin Prager,
Martin Prager
Material Properties Council, New York, NY
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Sarah Wrobel
Sarah Wrobel
Citgo Refining, USA, Calcasieu River, LA
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Warren Brown
The Equity Engineering Group, Shaker Heights, OH
Martin Prager
Material Properties Council, New York, NY
Sarah Wrobel
Citgo Refining, USA, Calcasieu River, LA
Paper No:
PVP2010-25795, pp. 807-812; 6 pages
Published Online:
January 10, 2011
Citation
Brown, W, Prager, M, & Wrobel, S. "A Case Study on the Effect of Peaked Pipe Welds on Piping Life Expectancy." Proceedings of the ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASME 2010 Pressure Vessels and Piping Conference: Volume 3. Bellevue, Washington, USA. July 18–22, 2010. pp. 807-812. ASME. https://doi.org/10.1115/PVP2010-25795
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