Recent Advances in Becht’s HTHA Damage Modeling Approach Part 5: Time-Dependent Nelson Curves for Carbon and C-0.5Mo Steels

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 […]

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Recent Advances in Becht’s HTHA Damage Modeling Approach- Part 4: Carbon Steel Dataset and Calibration

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 […]

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Recent Advances in Becht’s HTHA Damage Modeling Approach- Part 3: C-0.5Mo Dataset and Calibration

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 […]

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Recent Advances in Becht’s HTHA Damage Modeling Approach- Part 2: Through-Wall Damage Modeling

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, […]

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Recent Advances in Becht’s HTHA Damage Modeling Approach -Part 1

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 […]

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Improving Burner Design And Operation With CFD Modeling

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 […]

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CFD Modeling Of Mixing Tees – Design Of A Thermal Sleeve

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 […]

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Practical HTHA Experience And Timebased Nelson Curves For Improved Equipment Life Management

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 […]

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CFD Modeling of a Mixing Tee – Part 1: Model Validation

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 […]

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CFD Modeling of a Mixing Tee – Part 2: Predictions of Temperature Fluctuations

by Dave Dewees, Zumao Chen and L. Magnus Gustafsson Miss Part 1? Click Here This is the second part of a 2-part blog.  In Part 1, the stress-blended eddy simulation (SBES) and large eddy simulation (LES) approaches for simulating turbulence have been validated against test data obtained from a mixing tee. In this part, the […]

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