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High Temperature Hydrogen Attack (HTHA) Modeling Prediction and Non-Intrusive Inspection Review

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.

Product Number: 51317--8924-SG
ISBN: 8924 2017 CP
Author: M. Nugent / T. Silfies / J. D. Dobis / Tim Armitt
Publication Date: 2017
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$20.00
$20.00

The most significant change in in the last 25 years has been made for API 941 Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants (a.k.a The Nelson Curves). In addition to increased emphasis on condition monitoring and reporting practices the “curve” for Non-Post Weld Heat Treated Carbon Steel will effectively be lowered by 50°F from the existing Carbon Steel line and begin at 50 pisa pp H2. This will place a significant amount of equipment in an area of concern due to High Temperature Hydrogen Attack (HTHA) from a Mechanical Integrity perspective. A brief summary of the background for the evolution of these changes and the potential effect on equipment and piping will be discussed.To address this challenge presented to owner-users there is an ongoing Joint Industry Program (JIP) on evaluation of existing HTHA methods and evaluation of novel technologies. This paper will discuss the ongoing dynamic modeling development validation and application examples in an API 579 approach. In addition an overview of existing NDE modalities will be presented with respect to HTHA scanning and sizing.

Key words: High Temperature Hydrogen Attack, HTHA, Nelson Curve, Carbon Steel, C-0.5Mo, API RP 941, non-destructive examination, NDE, decarburization

The most significant change in in the last 25 years has been made for API 941 Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants (a.k.a The Nelson Curves). In addition to increased emphasis on condition monitoring and reporting practices the “curve” for Non-Post Weld Heat Treated Carbon Steel will effectively be lowered by 50°F from the existing Carbon Steel line and begin at 50 pisa pp H2. This will place a significant amount of equipment in an area of concern due to High Temperature Hydrogen Attack (HTHA) from a Mechanical Integrity perspective. A brief summary of the background for the evolution of these changes and the potential effect on equipment and piping will be discussed.To address this challenge presented to owner-users there is an ongoing Joint Industry Program (JIP) on evaluation of existing HTHA methods and evaluation of novel technologies. This paper will discuss the ongoing dynamic modeling development validation and application examples in an API 579 approach. In addition an overview of existing NDE modalities will be presented with respect to HTHA scanning and sizing.

Key words: High Temperature Hydrogen Attack, HTHA, Nelson Curve, Carbon Steel, C-0.5Mo, API RP 941, non-destructive examination, NDE, decarburization

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

Product Number: 51316-7516-SG
ISBN: 7516 2016 CP
Author: Trace Silfies
Publication Date: 2016
$20.00