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51316-7516-Looking Behind the Curtain of API 941 HTHA Data

Picture for Looking Behind the Curtain of API 941 HTHA Data
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Product Number: 51316-7516-SG
ISBN: 7516 2016 CP
Author: Trace Silfies
Publication Date: 2016
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$20.00
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This paper will present an eye-opening look at some of the historic data sources and correspondence that are the basis of the API RP 941 Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants (a.k.a. The Nelson Curves). The focus of the paper is primarily on carbon steel data but includes interesting information regarding the ‘removal’ of the C-0.5Mo curve. Included are comments highlighting some of the unknown/missing data incorporated into the Nelson Curves.In 2015 a significant change was made to the carbon steel curves in the 8th edition of API 941. It was the first significant change to the curves in the last 25 years and is based primarily on damage of non-post weld heat treated carbon steel that occurred after exposure times of 6 to 14 years. This new non-post weld heat treated carbon steel curve is approximately 50°F below the existing carbon steel line and begins at 50 psia partial pressure H2. Some of the failures that were utilized in the development of this new curve are atypical of traditional HTHA damage. A review of this damage morphology as well as other cases of similar damage of carbon steel and C-0.5Mo are included.
This paper will present an eye-opening look at some of the historic data sources and correspondence that are the basis of the API RP 941 Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants (a.k.a. The Nelson Curves). The focus of the paper is primarily on carbon steel data but includes interesting information regarding the ‘removal’ of the C-0.5Mo curve. Included are comments highlighting some of the unknown/missing data incorporated into the Nelson Curves.In 2015 a significant change was made to the carbon steel curves in the 8th edition of API 941. It was the first significant change to the curves in the last 25 years and is based primarily on damage of non-post weld heat treated carbon steel that occurred after exposure times of 6 to 14 years. This new non-post weld heat treated carbon steel curve is approximately 50°F below the existing carbon steel line and begins at 50 psia partial pressure H2. Some of the failures that were utilized in the development of this new curve are atypical of traditional HTHA damage. A review of this damage morphology as well as other cases of similar damage of carbon steel and C-0.5Mo are included.
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High Temperature Hydrogen Attack (HTHA) Modeling Prediction and Non-Intrusive Inspection Review

Product Number: 51317--8924-SG
ISBN: 8924 2017 CP
Author: M. Nugent / T. Silfies / J. D. Dobis / Tim Armitt
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There is an ongoing Joint Industry Program on the development of high temperature hydrogen attack (HTHA) remaining life assessment and evaluation of non-destructive examination technologies. HTHA model development and assessment examples will be discussed.
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51316-7233-A New Method for Prioritizing Equipment in HTHA Service for Inspection and Replacement

Product Number: 51316-7233-SG
ISBN: 7233 2016 CP
Author: Jeremy Staats
Publication Date: 2016
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Background on High Temperature Hydrogen Attack (HTHA). Some current developments in HTHA inspection and mitigation. How several refiners have instituted an HTHA risk management plan for their refineries and the challenges and pitfalls they have encountered
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51314-4212-Evaluation of HTHA Effect on Carbon Steel and Carbon 0.5 Mo Exchanger

Product Number: 51314-4212-SG
ISBN: 4212 2014 CP
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