UNS

8 cases · 16 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Product: Fabrication Weld Condition: Damage Capture method: Aspect Before Analysis clear all

UNS — sub-branches

G10050 1G10080 1G15240 1G41300 1S21800 1S30409 1S31603 1S32750 2S32760 1

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Aspect of the cracked valve body, after disassembling and removing the internal parts. The valve is part of a lot that was manufactured by forging a cubic 170mm from a forged bar in SDSS UNS S32760, and heat treated (solution annealed) by the forging company. The fabrication using these bodies included the machining, fillet weld two inserts in Alloy 625, machining again, assembling the internals, and pressure test at 15,000 psi. The cracking occurred during test, only for this valve body.
676
VIEW
ML00134 / Aug.2020
Brittle Fracture of a Superduplex Valve Body
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Fracture
Cm - Aspect Before AnalysisDf - Cracking
Aspect of the equipment presenting a through wall cracking at the margin of the fillet weld.
143
VIEW
ML00050 / Nov.2017
Fatigue Failure of a 316SS Pressure Stabilizer
M - Austenitic Stainless SteelP - Fabrication WeldAp - Chemical IndustryCd - Mechanical Fatigue
Cm - Aspect Before AnalysisDf - Cracking
Aspect of the hydraulic line samples removed from service to be analyzed. Tubing and welded joint (bottom sample) between the 316 tubing (left side of the sample) and the nitronic fitting (right side of the sample). The cracking is located 10 mm far from the weld, autogenous orbital GTAW.
108
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - General View
Aspect of the fitting welded to a tubing, ND 5/8" in a hydraulic line. The through wall cracking is longitudinal in the fitting side.
1032
VIEW
ML00094 / Sep.2017
MIC of a Subsea Hydraulic Line
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - General View
Fracture occurred during fabrication of a low carbon steel automotive part, welded by SAW process in one fillet, between a superior plate (8mm thick) and an inferior plate (12 mm thick). See the schematic drawing in the next figure.
290
VIEW
ML00069 / May.2017
Liquation Cracks in SAW of Low Carbon Steel
M - Low Carbon SteelP - Fabrication WeldAp - AutomotiveCd - Welding Defect
Cm - Aspect Before AnalysisDf - Fracture
The connector was welded to the pipe from both (internal and external) sides, a PWHT was applied and the part was machined. The UT indication was detected during final inspection.
78
VIEW
ML00072 / Jan.2018
Liquation Cracks in a High Strength Joint
M - Low Alloy Medium Carbon QTP - Longitudinal Seam Welded PipeAp - O&G Well DrillingCd - Welding Defect
Cm - Aspect Before AnalysisDf - General View
Aspect of the fillet weld between the superior plate (Low carbon 8 mm thick) and the inferior plate (C-Mn 12 mm thick), in an overlap geometry. In this region the welded joint was sound.
90
VIEW
ML00067 / May.2017
Cold Cracks in C-Mn SAW Weld Metal
M - CMn SteelP - Fabrication WeldAp - AutomotiveCd - Welding Defect
Cm - Aspect Before AnalysisDf - Welded Joint
Visual aspect from the external side of the 14"ND flange butt welded to a pipe, presenting a through wall crack about 5mm to 10mm from the butt welding.
925
VIEW
ML00002 / Jan.2018
Preferential Dissolution and Cracks in SDSS
M - Super Duplex Stainless SteelP - Fabrication WeldAp - PipingCd - Preferential Dissolution
Cm - Aspect Before AnalysisDf - Through Wall Cracking

More from these cases

ML00134 — Brittle Fracture of a Superduplex Valve BodyM - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Fracture
Detailed aspect of the cracking, straight and presenting a brittle aspect.
122
VIEW
ML00134 / Aug.2020
Brittle Fracture of a Superduplex Valve Body
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Fracture
Cm - Aspect Before AnalysisDf - Cracking
Detail of the internal bore, showing a brittle crack through the wall.
106
VIEW
ML00134 / Aug.2020
Brittle Fracture of a Superduplex Valve Body
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Fracture
Cm - Aspect Before AnalysisDf - Cracking
Image of the external surface of the valve body at the region where the Alloy 625 insert was fillet weld to the SDSS valve body. The surface was later machined, so it is possible to see only a mark indicating where the weld is. The brittle crack is arrested at the margin of the weld. It is possible to see strong deformation at the crack tip when it arrives the weld.
41
VIEW
ML00134 / Aug.2020
Brittle Fracture of a Superduplex Valve Body
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Fracture
Cm - Aspect Before AnalysisDf - External Surface
ML00095 — MIC of a Riser Control LineM - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Detail of the welded joint between the 316 tubing (left side) and the nitronic fitting (right side). The through wall cracking is transverse to the line, in the fitting, 10 mm far from the weld, where the fitting was slightly bent to be assembled (cold bent).
65
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - Welded Joint
ML00094 — MIC of a Subsea Hydraulic LineM - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Behavior
Detail of the longitudinal through wall cracking in the fitting welded to a tubing, ND 5/8" in a hydraulic line.
87
VIEW
ML00094 / Sep.2017
MIC of a Subsea Hydraulic Line
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - External Surface
Aspect of the internal side of the fitting to tubing welded joint, after longitudinal cut. It is possible to see that the cracking (still filled with corrosion products) is located in the fitting side (left side) far from the welded joint to the tubing (right side).
58
VIEW
ML00094 / Sep.2017
MIC of a Subsea Hydraulic Line
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - Internal Surface
ML00067 — Cold Cracks in C-Mn SAW Weld MetalM - CMn SteelP - Fabrication WeldAp - AutomotiveCd - Welding Defect
Aspect of the fracture in the middle of the fillet weld between the superior plate (Low carbon 8 mm thick no longer there) and the inferior plate (C-Mn 12 mm thick), in an overlap geometry.
77
VIEW
ML00067 / May.2017
Cold Cracks in C-Mn SAW Weld Metal
M - CMn SteelP - Fabrication WeldAp - AutomotiveCd - Welding Defect
Cm - Aspect Before AnalysisDf - Fracture
ML00002 — Preferential Dissolution and Cracks in SDSSM - Super Duplex Stainless SteelP - Fabrication WeldAp - PipingCd - Preferential Dissolution
After a longitudinal section of the flange to pipe weld, the through wall cracking opened in two parts and the fracture surface was analyzed. The flange side fracture surface is presented in this figure.
126
VIEW
ML00002 / Jan.2018
Preferential Dissolution and Cracks in SDSS
M - Super Duplex Stainless SteelP - Fabrication WeldAp - PipingCd - Preferential Dissolution
Cm - Aspect Before AnalysisDf - Fracture