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Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: FPSO Condition: Used Capture method: Optical Microscope clear all

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Micrography of the pipe base metal presenting a refined duplex ferritic austenitc structure, banded.
47
VIEW
ML00049 / Apr.2017
Pipe to Flange Welded Joint in a 14" ND Superduplex Spool
M - Super Duplex Stainless SteelP - Piping spoolAp - Oil and GasCd - Removed From Service
Cm - NaOH Electrolytic Etched MicroDf - Duplex structure

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ML00049 — Pipe to Flange Welded Joint in a 14" ND Superduplex SpoolM - Super Duplex Stainless SteelP - Piping spoolAp - Oil and GasCd - Removed From Service
Micrographic detail of the pipe base metal presenting a refined duplex ferritic austenitc structure, banded.
55
VIEW
ML00049 / Apr.2017
Pipe to Flange Welded Joint in a 14" ND Superduplex Spool
M - Super Duplex Stainless SteelP - Piping spoolAp - Oil and GasCd - Removed From Service
Cm - NaOH Electrolytic Etched MicroDf - Base Metal
Micrographic detail of the pipe base metal presenting a refined duplex ferritic austenitc structure, banded.
56
VIEW
ML00049 / Apr.2017
Pipe to Flange Welded Joint in a 14" ND Superduplex Spool
M - Super Duplex Stainless SteelP - Piping spoolAp - Oil and GasCd - Removed From Service
Cm - NaOH Electrolytic Etched MicroDf - Duplex structure
Micrography of the flange base metal presenting a coarse duplex ferritic austenitc structure.
88
VIEW
ML00049 / Apr.2017
Pipe to Flange Welded Joint in a 14" ND Superduplex Spool
M - Super Duplex Stainless SteelP - Piping spoolAp - Oil and GasCd - Removed From Service
Cm - NaOH Electrolytic Etched MicroDf - Duplex structure
Micrographic detail of the flange base metal presenting a coarse duplex ferritic austenitc structure. Detrimental phases associated to the ferritic structure.
62
VIEW
ML00049 / Apr.2017
Pipe to Flange Welded Joint in a 14" ND Superduplex Spool
M - Super Duplex Stainless SteelP - Piping spoolAp - Oil and GasCd - Removed From Service
Cm - NaOH Electrolytic Etched MicroDf - Duplex structure
Micrography of the pipe heat affected zone. In the left the pipe base metal, with banded duplex structure; and in the right the weld metal, with Widmanstatten morphology of the structure.
43
VIEW
ML00049 / Apr.2017
Pipe to Flange Welded Joint in a 14" ND Superduplex Spool
M - Super Duplex Stainless SteelP - Piping spoolAp - Oil and GasCd - Removed From Service
Cm - NaOH Electrolytic Etched MicroDf - Heat Affected Zone

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