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03657 Failure Mechanisms of Alloy 800H in Steam Reformer Furnace Pigtails

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Product Number: 51300-03657-SG
ISBN: 03657 2003 CP
Author: Padma Kodali and John P Richert
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This paper will discuss the results of an investigation into cracking that occurred on alloy 800H pigtails from a steam reformer furnace. Typically, cracks on pigtails occur circumferentially due to high bending stresses in the bends, or at welded connections. However, in present samples, longitudinal cracks were found on the pigtails. Metallurgical evaluation revealed that the pigtails had cracked from both ID and OD as a result of intergranular stress oxidation cracking. This failure mechanism results from the combination of intergranular creep crack growth from repeated loading and high temperature oxidation. Our metallurgical observations are consistent with a common failure mechanism reported foralloy 800H. Keywords: Alloy 800H, intergranular stress oxidation cracking, pigtails, hairpins, steam reformer furnace
This paper will discuss the results of an investigation into cracking that occurred on alloy 800H pigtails from a steam reformer furnace. Typically, cracks on pigtails occur circumferentially due to high bending stresses in the bends, or at welded connections. However, in present samples, longitudinal cracks were found on the pigtails. Metallurgical evaluation revealed that the pigtails had cracked from both ID and OD as a result of intergranular stress oxidation cracking. This failure mechanism results from the combination of intergranular creep crack growth from repeated loading and high temperature oxidation. Our metallurgical observations are consistent with a common failure mechanism reported foralloy 800H. Keywords: Alloy 800H, intergranular stress oxidation cracking, pigtails, hairpins, steam reformer furnace
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Damage example cases of pigtails under high temperature and pressure. Also: the technique for the remaining life assessment of pigtails - based on the relation between OD change and life consumption.
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