FCTM Esope

S4.14 - Fitness-For-Service Techniques for High Temperature Hydrogen Attack Damage

Oct 7, 2021 | 3:30 PM - 4:00 PM

Le Montage


High-temperature hydrogen attack (HTHA) is a damage mechanism that can adversely affect the service life of carbon steel and low-chrome steel pressure equipment in the petroleum refining, ammonia production, and related industries. Long-term exposure to high-temperature hydrogen environments can lead to volumetric HTHA damage, due to the formation and coalescence of material micro voids, that can diminish the load carrying capacity of pressure equipment and can accelerate the propagation of crack-like flaws, especially near welds. This paper summarizes some evolving developments in HTHA technology and discusses methods for modeling HTHA damage progression. Additionally, recent enhancements in non-destructive examination (NDE) are explored. Furthermore, an outline of how these new engineering and inspection technologies will impact industry Codes and Standards and recommended practices is provided. An overview of fitness-for-service (FFS) techniques to provide protection against plastic collapse, crack growth, and brittle fracture due to HTHA damage are presented. Furthermore, based on advanced engineering analysis and inspection, integrity operating windows (IOWs) can be established to maintain safe operating limits for affected equipment. Lastly, this paper offers insight into identifying HTHA risks, predicting damage progression over time, and employing risk mitigation strategies.

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