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2 cases · 22 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Standard: 862 Detail focus: Damage clear all

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Detail of the through wall cracking that caused the leakage in the 2" pipe. The crack was originated in the fillet weld, from the end of the reinforced rib.
73
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Aspect Before AnalysisDf - Fatigue Crack
Internal aspect of the 8" diameter pipe that suffered localized thinning and leakage. The vertical weld is the pipe seam and the horizontal weld is the circunferential butt weld.
564
VIEW
ML00005 / Apr.2017
Environmental Hydrogen Damage in Ti Pipe
M - Unalloyed TitaniumP - Longitudinal Seam Welded PipeAp - PipingCd - Hydride Formation
Cm - Aspect Before AnalysisDf - Localized Thinning

More from these cases

ML00179 — Hydrides in Titanium WeldM - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Detail of the end of the rib, with a crack in the fillet weld metal, propagating through the pipe wall.
40
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Aspect Before AnalysisDf - Cracking
The through wall cracking was opened by longitudinal cutting of the pipe in two positions, to analyzed the region where the crack was nucleated.
33
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Fracture Surface AspectDf - Fracture
Aspect of the opened crack, showing the flat fracture. The through wall cracking started at the welded region at the end of the rib.
39
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Fracture Surface AspectDf - Fracture
Aspect of the opened crack by scanning electron microscopy, showing the coarser structure in the weld (right side of the figure).
33
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Fractography by SEMDf - Fracture
In the region where the fracture started there are brittle aspects resembling a cleavage micromechanism and several secondary cracks, transverse to the fracture surface, as well as propagation by fatigue (striation).
36
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Fractography by SEMDf - Brittle Cracks

+7 more from this case →

ML00005 — Environmental Hydrogen Damage in Ti PipeM - Unalloyed TitaniumP - Longitudinal Seam Welded PipeAp - PipingCd - Hydride Formation
Aspect of the internal surface of the pipe at the welded region, showing the interface of the thinning area in the weld and the pipe base metal.
128
VIEW
ML00005 / Apr.2017
Environmental Hydrogen Damage in Ti Pipe
M - Unalloyed TitaniumP - Longitudinal Seam Welded PipeAp - PipingCd - Hydride Formation
Cm - Surface Aspect by SEMDf - Localized Thinning
Region of the localized thinning at the weld metal, in a metallographic section, as polished. In the base metal the hydride layer is continuous and no thinning is evident (left side of the figure) and in the weld metal it is detached and cracked (right side of the figure).
107
VIEW
ML00005 / Apr.2017
Environmental Hydrogen Damage in Ti Pipe
M - Unalloyed TitaniumP - Longitudinal Seam Welded PipeAp - PipingCd - Hydride Formation
Cm - Micrography by SEMDf - Localized Thinning
The pipe base metal, at the internal surface, presents a hydride layer showing that the environment is absorbing hydrogen. Although there are microcracks in this layer it did not detach in the base metal.
102
VIEW
ML00005 / Apr.2017
Environmental Hydrogen Damage in Ti Pipe
M - Unalloyed TitaniumP - Longitudinal Seam Welded PipeAp - PipingCd - Hydride Formation
Cm - Kroll Etched Micrography by OMDf - Hydride Formation
The pipe internal suface, at the welded region, presents no hydride layer (because it has detached) as well as the material itself is suffering brittle detachment.
71
VIEW
ML00005 / Apr.2017
Environmental Hydrogen Damage in Ti Pipe
M - Unalloyed TitaniumP - Longitudinal Seam Welded PipeAp - PipingCd - Hydride Formation
Cm - Kroll Etched Micrography by OMDf - Localized Thinning
Detail, as polished, of brittle cracks in the weld metal, from the internal side of the pipe.
67
VIEW
ML00005 / Apr.2017
Environmental Hydrogen Damage in Ti Pipe
M - Unalloyed TitaniumP - Longitudinal Seam Welded PipeAp - PipingCd - Hydride Formation
Cm - Micrography by OMDf - Brittle Cracks

+3 more from this case →