High-Temperature Creep Assessment Methodology & Case Studies

High-Temperature Creep Assessment Methodology & Case Studies

Presenters: Kevin Haley, P.E.; Raj Patadia, P.E. 
Date: March 20, 2025 | 11:00 AM EST

FFS assessment of components operating at elevated temperatures in the creep regime can pose several challenges. The results of any assessment are highly sensitive to the key analysis inputs – stress, temperature, time, and material properties. Unfortunately, many times, historical operating process data is required to accurately capture these inputs, and the end results when using conservative assumptions versus accurate inputs are often the difference between predicting component end of life or predicting significantly longer allowable time in service, respectively. This presentation will discuss approaches for performing creep rupture life analysis, addressing critical data requirements, and evaluating the sensitivity to analysis inputs. Additionally, methods to refine input data, as well as alternative analysis methods, from closed-form calculations to detailed inelastic finite element analysis, will be provided. Case studies will be presented to highlight each end of the analytical spectrum, and commentary on the value of performing physical creep tests on ex-service fired heater tube or other component samples will be offered. 

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