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2 cases · 6 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Offshore Microstructure: Austenite Capture method: Aspect Before Analysis clear all

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General view of the 2" branch line that was supporting an instrument in a 12" gas piping of an offshore unity. The branch line is composed by a seamless pipe welded to a weldolet (left side of the figure) and to a flange (right side of the figure). The leakage is associated to a through wall cracking in the middle of the pipe length. The cracking is not evidenced in the figure, since it is too thin. See the schematic drawing in the next figure
494
VIEW
ML00012 / Aug.2017
Vibration Induced Fatigue in a 316/316L SS
M - Austenitic Stainless SteelP - Seamless PipeAp - OffshoreCd - Vibration Induced Fatigue
Cm - Aspect Before AnalysisDf - General View
Visual aspect of the 3/8" diameter pin surface, presenting several lozalized corrosion spots.
53
VIEW
ML00016 / Apr.2017
SCC in Free Cutting 303SS
M - Austenitic Stainless SteelP - Machined PartAp - OffshoreCd - Stress Corrosion
Cm - Aspect Before AnalysisDf - At the Surface

More from these cases

ML00012 — Vibration Induced Fatigue in a 316/316L SSM - Austenitic Stainless SteelP - Seamless PipeAp - OffshoreCd - Vibration Induced Fatigue
Aspect of the internal surface of the pipe after longitudinal cutting, presenting a straight cracking, circumferential. The weldolet is to the left side and the flange is to the right side. See the schematic drawing in the next figure.
89
VIEW
ML00012 / Aug.2017
Vibration Induced Fatigue in a 316/316L SS
M - Austenitic Stainless SteelP - Seamless PipeAp - OffshoreCd - Vibration Induced Fatigue
Cm - Aspect Before AnalysisDf - Internal Surface
Aspect of the internal surface of the 2" nominal diameter pipe, SCH 40, presenting a circumferential through wall cracking in the pipe, not associated to any of the welded joints. It is possible to see the cracking parallel to the two welded joints: the pipe to weldolet (left side of the figure); and the pipe to flange (right side of the figure).
64
VIEW
ML00012 / Aug.2017
Vibration Induced Fatigue in a 316/316L SS
M - Austenitic Stainless SteelP - Seamless PipeAp - OffshoreCd - Vibration Induced Fatigue
Cm - Aspect Before AnalysisDf - Through Wall Cracking
Aspect of the internal surface of the 2" nominal diameter pipe, SCH 40, presenting a circumferential through wall cracking in the pipe, not associated to any of the welded joints. It is possible to see the cracking parallel to the two welded joints: the pipe to weldolet (left side of the figure); and the pipe to flange (right side of the figure).
57
VIEW
ML00012 / Aug.2017
Vibration Induced Fatigue in a 316/316L SS
M - Austenitic Stainless SteelP - Seamless PipeAp - OffshoreCd - Vibration Induced Fatigue
Cm - Aspect Before AnalysisDf - Through Wall Cracking
Circumferential cracking in the middle of the pipe, view from the external side. Several pits close to the cracking.
57
VIEW
ML00012 / Aug.2017
Vibration Induced Fatigue in a 316/316L SS
M - Austenitic Stainless SteelP - Seamless PipeAp - OffshoreCd - Vibration Induced Fatigue
Cm - Aspect Before AnalysisDf - External Surface