Overview We presented a comprehensive five part series on our HTHA modeling approach in the fall of 2020. This series extended the initial work presented in [1] in several significant ways, including: Inclusion of vessel pressure and weld residual stresses Treatment of C-0.5Mo material Direct relation of the damage and life fractions the model predicts […]
Overview The first four parts of this series have described the updated Becht HTHA model and presented extensive validation for its application to Carbon Steel and C-0.5Mo. Based on this validation, time-based Nelson Curves for Carbon Steel (CS) and C-0.5Mo suitable for inclusion in API RP 941 [1] are now presented. General Assumptions Curves are […]
Overview Part 3 of this series presented the data set and calibration used to characterize C-0.5Mo performance. This part extends the calibration to Carbon Steel using the same basic calibration procedure. Unlike C-0.5Mo where carbon activity was used as the calibration parameter, for Carbon Steel the carbon activity is assumed to be 1 in all […]
Overview Part 2 of this series presented the extension of our model to C-0.5Mo material and calibration to very detailed through-wall damage data for five C-0.5Mo cases (from [1]). This part completes the analysis of C-0.5Mo by including data from API RP 941 [2] (including both plotted and file points) and the remaining cases from […]
Overview In Part 1 of this blog series an overview of two basic extensions to our void growth based HTHA model was given. In this part, validation of through-wall damage predictions are provided by leveraging the unique and exceptionally detailed work presented in the Peng Lui PhD dissertation [1]. Validation is critical for any model, […]
Overview This past spring, we described how we’ve incorporated well-established void growth modeling into our high temperature hydrogen attack (HTHA) assessment approach [1]. The purpose of this extension was to blend a reliable time basis for HTHA with our existing critical factor-based method (also published in the Inspectioneering Journal 6 years earlier [2]). The Inspectioneering […]
by Dave Dewees & Zumao Chen Computational fluid dynamics (CFD) modeling can be used as an efficient and low-cost alternative to improve the design and operation of a new burner. There are many factors that affect the performance of burners in a charge heater in a refinery. The burner must maintain a certain heat flux […]
Published in Hydrocarbon Processing, August 2020 hydrocarbonprocessing.com/magazine by Dave Dewees, Zumao Chen, Magnus Gustafsson Mixing tees – in which two fluid streams with different physical and/or chemical properties mix – are widely used in the petrocemcial industry. When there is a large temperature difference between two streams, large metal temperature fluctuations can occur in the […]
Recently, Becht published an article in Inspectioneering Journal regarding High Temperature Hydrogen Attack. This article was written by: DAVE DEWEES, PE, Mechanical Engineering Division Manager GERRIT BUCHHEIM, PE, Refining Metallurgical and Corrosion Expert & Pono Division Manager JEREMY STAATS, PE, Refining Corrosion and Materials Engineer CHARLES BECHT V, PE, Vice President of Engineering Abstract […]
by Dave Dewees, Zumao Chen and L. Magnus Gustafsson This 2-part blog deals with CFD modeling of a mixing tee that is often found in industry. Traditional simulation is validated against experiment, as well as a new commercially available method that offers the possibility of substantial solution time reduction. In fact, the new method is shown […]
