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Integrating Empirical And Quantitative HTHA Assessment Approaches With Fitness-For-Service And State Of The Art Inspection Techniques For Risk Assessment And Continued Management Of Equipment In HTHA Service

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  • Integrating Empirical And Quantitative HTHA Assessment Approaches With Fitness-For-Service And State Of The Art Inspection Techniques For Risk Assessment And Continued Management Of Equipment In HTHA Service
Picture for Integrating Empirical And Quantitative HTHA Assessment Approaches With Fitness-For-Service And State Of The Art Inspection Techniques For Risk Assessment And Continued Management Of Equipment In HTHA Service
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Product Number: 51321-16782-SG
Author: Jeremy Staats; Gerrit Buchheim; Dave Dewees; Frank Sapienza
Publication Date: 2021
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$20.00
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Historical management strategies for equipment subject to high temperature hydrogen attack (HTHA) have traditionally relied on risk assessment with empirical or quantitative models. Given a lack of confidence in early inspection techniques for HTHA, operation of equipment with known susceptibility to HTHA for prolonged service periods has been limited. A quantitative model for HTHA damage has been created based on void growth models combined with a creep model. This model has been calibrated to known failures and damage cases reported in industry (API 941). The results are time-based Nelson curves and the ability to combine varying operating conditions to calculate a life and combining this with practical adjustment factors and NDE results allows for more accurate life estimates and accumulated damage predictions. The theory and practical examples will be included.

Historical management strategies for equipment subject to high temperature hydrogen attack (HTHA) have traditionally relied on risk assessment with empirical or quantitative models. Given a lack of confidence in early inspection techniques for HTHA, operation of equipment with known susceptibility to HTHA for prolonged service periods has been limited. A quantitative model for HTHA damage has been created based on void growth models combined with a creep model. This model has been calibrated to known failures and damage cases reported in industry (API 941). The results are time-based Nelson curves and the ability to combine varying operating conditions to calculate a life and combining this with practical adjustment factors and NDE results allows for more accurate life estimates and accumulated damage predictions. The theory and practical examples will be included.

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