This paper explains the cause of the failures, the follow up incident investigation and the actions taken to prevent recurrence of a similar failure. This case study details the failure of recently re...
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The failure analysis study is described in detail in this paper, and the mechanism of the crack is identified and proper recommendation is given to avoid such issues in future operations.
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In order to find out the cracking causes and mechanism, this paper presents the failure investigation on the welded joints of hydrogen reformer outlet pigtail tubes by visual inspection,
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Detailed microstructural characterization using various electron-optical techniques and mechanical property evaluation were employed to determine the cause of
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Pigtails are used to transfer syn-gas from reformer tubes to manifolds and experience high stresses from temperature and pressure. Common failure mechanisms include creep rupture, cracking at bends
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It will also cover the causes of damage, appropriate inspection methods, and assessment methodologies adopted for estimating creep remaining life. All of this is presented in an
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The pigtails do have a much smaller diameter than the reformer tubes, making them suitable to nipping. ''Nipping'' is the squeezing together of a tube, until it is completely flat and therefore restricts the gas
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Detailed microstructural characterization using various electron-optical techniques and mechanical property evaluation were employed to determine the cause of failure. Selection of pipe material and
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Although API 530 provides high temperature design guidance, API TR 942-A indicates many operators continue to experience unexplained repetitive incidents of creep rupture of outlet pigtails and
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This case study details the failure of recently replaced inlet pigtail pipes for a hydrogen reformer furnace.
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On the outlet header, an Alloy 800 HT pigtail failed by creep failure after 42,000 hours of service. This paper explains the cause of the failures, the follow up incident investigation and the actions taken to
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Semantic Scholar extracted view of "Failure analysis of cracking in the welded joints of hydrogen reformer outlet pigtail tubes" by Gang Li et al.
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