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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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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Risk Ranking Of Cracking Failures Of Duplex Stainless Steel (DSS) REACs In Hydroprocessing Equipment – An Update

Introduction This is an update to our previous blog on cracking of refinery hydroprocessing REACs made of duplex stainless steel:  View Original Post 2205 DSS (UNS S31803 or S32205) has been used in refinery hydroprocessing unit reactor effluent air coolers (REACs) since the mid 1980’s (1).  2205 was selected due to its good resistance to ammonium […]

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Origins and Fates of Chlorides in Hydroprocessing Units – Part 3: Managing the Chlorides

The first two articles of this series provided a methodical approach to identifying a chloride problem in a hydroprocessing unit, determining the size of the problem, and narrowing it down to a likely source or sources.  This final article addresses approaches to dealing with various sources. Step 4 – Managing the Chlorides Now that you […]

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Origins and Fates of Chlorides in Hydroprocessing Units – Part 2: Magnitude and Source(s) the Problem

The first article of this series introduced the symptoms of a chloride problem in a hydroprocessing unit.  In this article, we will explore how to interpret the symptoms by determining how much chloride-containing material we are looking for and identifying the possible or likely source(s) for this amount of material, embodied in Steps 2 and […]

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