Aspect Before Analysis

3 cases · 11 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Ship Standard: ALLOY clear all

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Macroscopic aspect of the outer diameter of the flanged sleeve presenting adhered products at the surface. The flanged sleeve was manufactured by centrifugal casting in a lean duplex stainless steel and it was externally coated by thermal spray (TS) in a position of sealing. After 5 years in service the system suffered leakage.
569
VIEW
ML00147 / Aug.2018
WC Layer Detached from a Cast Lean Duplex
M - Lean Duplex Stainless SteelP - Centrifugal CastingAp - ShipCd - Lack of Sealing
Cm - Aspect Before AnalysisDf - External Surface
Aspect of the broken spring. The wire is 1 1/2" diameter and the ourter diameter of the spirals is 12 1/2", in a 20" height spring. It was broken in several pieces.
866
VIEW
ML00137 / Mar.2021
Brittle Fracture of a 15-5 PH Valve Spring
M - Precipitation Hardened Stainless SteelP - SpringAp - Oil and GasCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - General View
The welded joint of the flat position is shown from the root side. It is possible to see that the use of the backing generated the possibility for melting the base metal out of the groove, without detection of this condition during welding, responsible for creating defects and avoiding the WPS qualification.
102
VIEW
ML00118 / Jan.2018
Non qualified GMAW of Aluminum Plates
M - Aluminum Magnesium ManganeseP - Welded Testpiece for QualificationAp - ShipCd - Non qualified
Cm - Aspect Before AnalysisDf - General View

More from these cases

ML00147 — WC Layer Detached from a Cast Lean DuplexM - Lean Duplex Stainless SteelP - Centrifugal CastingAp - ShipCd - Lack of Sealing
General view of the 10" diameter flanged sleeve, 1/2" wall thickness, manufactured by centrifugal casting of lean duplex stainless steel (DSS), Alloy 2304 (without Mo), with an external coating applied by thermal spray (TS). The sleeve is assembled in a shaft. The internal environment is oil and a seal box is assembled in the external side that is wet with seawater.
56
VIEW
ML00147 / Aug.2018
WC Layer Detached from a Cast Lean Duplex
M - Lean Duplex Stainless SteelP - Centrifugal CastingAp - ShipCd - Lack of Sealing
Cm - Aspect Before AnalysisDf - General View
General view of the 10" diameter flanged sleeve, with the external coating applied by thermal spray (TS), and the sealing rings of the seal box assembled at the sleeve external surface. It is important to observe that the internal surface of the sleeve presents no corrosion spots.
23
VIEW
ML00147 / Aug.2018
WC Layer Detached from a Cast Lean Duplex
M - Lean Duplex Stainless SteelP - Centrifugal CastingAp - ShipCd - Lack of Sealing
Cm - Aspect Before AnalysisDf - General View
General view of the 10" diameter flanged sleeve, with the sealing rings of the seal box assembled at the sleeve external surface. The right side of the figure shows the surface region where the a lack of seal was identified, with adhered products.
24
VIEW
ML00147 / Aug.2018
WC Layer Detached from a Cast Lean Duplex
M - Lean Duplex Stainless SteelP - Centrifugal CastingAp - ShipCd - Lack of Sealing
Cm - Aspect Before AnalysisDf - External Surface
ML00137 — Brittle Fracture of a 15-5 PH Valve SpringM - Precipitation Hardened Stainless SteelP - SpringAp - Oil and GasCd - Brittle Behavior
Aspect of the fracture of the spring. Close to the surface the fracture presents the aspect of rusted spots.
132
VIEW
ML00137 / Mar.2021
Brittle Fracture of a 15-5 PH Valve Spring
M - Precipitation Hardened Stainless SteelP - SpringAp - Oil and GasCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - Fracture
The spring ruptured in several positions. This is the aspect of one of the fractures of the spring. In the initiation of the fracture (top side of the figure) the fracture presents a different morphology.
101
VIEW
ML00137 / Mar.2021
Brittle Fracture of a 15-5 PH Valve Spring
M - Precipitation Hardened Stainless SteelP - SpringAp - Oil and GasCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - Brittle Fracture
Corroded spots (shallow pits) at the spring surface.
84
VIEW
ML00137 / Mar.2021
Brittle Fracture of a 15-5 PH Valve Spring
M - Precipitation Hardened Stainless SteelP - SpringAp - Oil and GasCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - At the Surface
Aspect of the fracture surface showing a strong difference between the fracture initiation and fracture propagation. This fracture was sectioned and the micrographies are presented showing the diferences in the fracture morphology.
40
VIEW
ML00137 / Mar.2021
Brittle Fracture of a 15-5 PH Valve Spring
M - Precipitation Hardened Stainless SteelP - SpringAp - Oil and GasCd - Brittle Behavior
Cm - Aspect Before AnalysisDf - Fracture
ML00118 — Non qualified GMAW of Aluminum PlatesM - Aluminum Magnesium ManganeseP - Welded Testpiece for QualificationAp - ShipCd - Non qualified
The welded joint of the vertical up position is shown from the root side. It is possible to see that the use of the backing generated the possibility for melting the base metal out of the groove, without detection of this condition during welding, responsible for creating defects and avoiding the WPS qualification.
122
VIEW
ML00118 / Jan.2018
Non qualified GMAW of Aluminum Plates
M - Aluminum Magnesium ManganeseP - Welded Testpiece for QualificationAp - ShipCd - Non qualified
Cm - Aspect Before AnalysisDf - General View