Breakthroughs in Predictive HTHA Life Assessment: Time Dependent Nelson Curves and Inspection Planning Enhancements

Published in the Inspectioneering Journal, January/February 2022 Introduction Nearly two years ago, in an Inspectioneering Journal article, Practical HTHA Experience and Time-Based Nelson Curves for Improved Equipment Life Management, we described how to incorporate well-established void growth modeling (see Figure 1) into a high temperature hydrogen attack (HTHA) assessment approach [1]. Since then, we have […]

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Recent Advances in Becht’s HTHA Damage Modeling Approach Part 6: Nucleation Effects and Cutoff Pressure Prediction

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 […]

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Becht HTHA JIP Looks to Extend Industry-Leading Equipment Management

with Sridhar Srinivasan Becht is pleased to announce the official launch of the Becht Joint Industry Project on High Temperature Hydrogen Attack: Comprehensive Life Management of HTHA Susceptible Equipment.  We’re excited to bring our multidisciplinary team of materials, inspection, modeling, fitness-for-service and software experts working with global plant operators and JIP sponsors to take our […]

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CorrExpert®-Crude: Corrosion Prediction and Material Selection for Refinery Crude Corrosivity Applications

State-of-the-art Cloud-based Decision Support Model drives enhanced crude processing flexibility and unit mechanical integrity through accurate, simultaneous quantification of naphthenic acid and sulfidic corrosion Refinery Crude Unit operations, characterized by significant process complexities and crude blend / fraction assay properties, have traditionally remained an area where accurate asset integrity and life prediction have been difficult […]

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Becht Experts Participate In Q&A In Recent Issue Of Digital Refining

Participants: Gerrit Buchheim, Mel Larson, Fred Lea, and Robert Ohmes To review the Q&A article in Digital Refining, please click HERE   We didn’t expect severe corrosion issues in the carbon steel of our amine unit. What’s causing it?  – Gerrit Buchheim Severe corrosion in amine units is not rare and should be expected.  Depending […]

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Corrosion And Materials Challenges In Energy Transition

Global trends towards lowering greenhouse gas emissions has forced energy companies to reevaluate their operating strategies. The challenge is time and concepts to achieve a “net zero,” which means looking at alternative feedstocks and new processes.  These pressures are leading towards a global energy transition. While some biofuel processes have been around for approximately 20 […]

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Optimizing Information from Thickness Data

With contributing author Frank Sapienza Thickness measurement data generated through the routine inspection program represents the largest source of data generated in the mechanical integrity department of a refinery. Gathering as much usable information from this data in a time efficient manner presents one of the greater challenges to plant inspectors and engineers.  Some refineries […]

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Integration Of Integrity Operating Windows Into Process Safety Management

Integrity Operating Windows (IOWs) are an important component of a world class mechanical integrity program. IOWs are not a new concept, as they have been around in different forms for many years. However, due to some recent high-profile industry indictments and with the publication of the first edition of API RP 584 Integrity Operating Windows […]

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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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