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Open AccessArticle

Investigation of Stress-Oriented Hydrogen-Induced Cracking (SOHIC) in an Amine Absorber Column of an Oil Refinery

1
Department of Mechanical Engineering, Khalifa University of Science and Technology, Abu Dhabi 127788, UAE
2
Department of Mechanical Engineering, University of Thessaly, 38334 Volos, Greece
3
Motor Oil Hellas, Korinth Refinery, 20100 Korinth, Greece
*
Author to whom correspondence should be addressed.
Metals 2018, 8(9), 663; https://doi.org/10.3390/met8090663
Received: 4 August 2018 / Revised: 22 August 2018 / Accepted: 22 August 2018 / Published: 24 August 2018
(This article belongs to the Special Issue Failure Mechanisms in Alloys)
Stress-oriented hydrogen-induced cracking (SOHIC) of an amine absorber column made of a Hydrogen Induced Cracking (HIC) resistant steel and operating under wet H2S service was investigated. SOHIC was not related to welds in the column and evolved in two steps: initiation of HIC cracks in the rolling plane and through-thickness linking of the HIC cracks. Both the original HIC cracks as well as the linking cracks propagated with a cleavage mechanism. The key factors identified were periods with high hydrogen charging conditions, manifested by high H2S/amine ratio, and stress triaxiality, imposed by the relatively large thickness of the plate. In addition, the mechanical properties of the steel away from cracked regions were unaffected, indicating the localized nature of SOHIC. View Full-Text
Keywords: hydrogen-assisted cracking; corrosion; SOHIC; cleavage fracture hydrogen-assisted cracking; corrosion; SOHIC; cleavage fracture
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MDPI and ACS Style

Haidemenopoulos, G.N.; Kamoutsi, H.; Polychronopoulou, K.; Papageorgiou, P.; Altanis, I.; Dimitriadis, P.; Stiakakis, M. Investigation of Stress-Oriented Hydrogen-Induced Cracking (SOHIC) in an Amine Absorber Column of an Oil Refinery. Metals 2018, 8, 663.

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