SCORCH JIP - Feedback on MIC and Pitting Corrosion from Field Recovered Mooring Chain Links

Fontaine, Emmanuel; Rosen, J.; Potts, Andrew; Ma, Kai-Tung; Melchers, Robert E.

doi:10.4043/25234-ms

Cited by 14 publications

(6 citation statements)

References 12 publications

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“…Almost certainly, this can be attributed to the high level of nutrient pollution in the North Sea [34] contributing to microbiologically-influenced corrosion and causing more severe and much deeper pitting [35]. The severe pitting caused by high levels of nutrient pollution has been observed also off the coast of Nigeria in oil exploration areas [36]. The important point here is the stepped, progressive, development of pit depth.…”

Section: Trends In Pit Depth and Corrosion Lossmentioning

confidence: 99%

A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures

Melchers

2018

CMD

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For infrastructure applications in marine environments, the eventual initiation of corrosion (and pitting) of steels (and other metals and alloys) often is assumed an inescapable fact, and practical interest then centres on the rate at which corrosion damage is likely to occur in the future. This demands models with a reasonable degree of accuracy, preferably anchored in corrosion theory and calibrated to actual observations under realistic exposure conditions. Recent developments in the understanding of the development of corrosion loss and of maximum pit depth in particular are reviewed in light of modern techniques that permit much closer examination of pitted and corroded surfaces. From these observations, and from sometimes forgotten or ignored observations in the literature, it is proposed that pitting (and crevice corrosion) plays an important role in the overall corrosion process, but that longer term pitting behaviour is considerably more complex than usually considered. In turn, this explains much of the, often high, variability in maximum depths of pits observed at any point in time. The practical implications are outlined.

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Section: Trends In Pit Depth and Corrosion Lossmentioning

confidence: 99%

A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures

Melchers

2018

CMD

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“…This may happen when used especially for deepwater applications with large vessel excursions, [19], [20] • Failure on deepwater chain link due to locking and out of plane loading in chain links, [21] • Fatigue damage in dynamic components. Microbial induced corrosion can decrease the fatigue life, [22] • Pitting corrosion can be severe with microbiological, [22] • Corrosion as function of time may be difficult to design for, [23] • Wireline corrosion and degradation of fatigue life • Wireline birdcage damage due to seabed contact • Thruster-assisted moorings (TAM) can have undesirable thruster response. If TAM is considered, all codes recommend that a comprehensive failure mode and effect analysis (FMEA) be performed.…”

Section: Mooring System Failuresmentioning

confidence: 99%

Mooring of MRE Structures - Comparison of Codes, Including IEC

Stewart¹,

Achanta

2015

All Days

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Objectives/ScopeThis paper presents guidance on the design and selection of mooring systems, including anchors, specifically for Marine Renewable Energy (MRE) systems. It is based in part on the work of the ASCE COPRI MRE Committee over the last five years. The document gives guidance to MRE designers and analysts and gives confidence as to mooring systems reliability. Methods, Procedures, ProcessThere are a few MRE systems, especially for Wave Energy Converters (WECs) that have evolved, which may be regarded as having a basically similar mooring system. However, selection of design criteria, including environmental conditions return period (and other parameters) as well as safety factors for WEC moorings has not yet evolved into a standard procedure. This paper contrasts the mooring system characteristics that are found for some typical WEC moorings when their design is selected to meet various mooring codes and standards. Codes considered include those published by: Results, Observations, ConclusionsDifferences in the mooring codes are contrasted. Differences in the resulting mooring systems characteristics are contrasted resulting from using different codes. Differences in the systems are also contrasted with selection of different return periods and other environmental parameters. The results are also presented in the framework of the MRE Committee's approach to risk and reliability that has been developed by the oil and gas (O&G) industry over the last 40 years.Novel/Additive Information This paper presents an insight as to what is in the ASCE COPRI MRE guide for moorings OTC-26035-MS 9

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“…These structures are generally designed to withstand environmental loads such as waves, currents, wind, and operational forces. Due to the subsea environment, corrosion has also been regarded as one of main degradation types affecting the integrity of the submerged part of these structures, e.g., monopiles, mooring chains, and pipelines [ 1 , 2 , 3 , 4 ]. Additionally, the presence of marine growth on the surface of the submerged structure presents a challenge in detailed assessments of the structural integrity.…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Acoustic Emission Monitoring of Corrosion under Marine Growth

Alkhateeb

Riccioli

Morales³

et al. 2022

Sensors

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Offshore support structures and mooring systems are predominantly subject to corrosion and fatigue. These structures are typically covered with marine growth of various types. Conventional inspection methods for assessment of the structural integrity require access to the cleaned surface of these structures; however, the cleaning process is highly undesirable from the technical, economical, and environmental points of view. This paper highlights research on feasibility assessment of detection and localization of corrosion damage under marine growth using acoustic emission (AE). Experiments were conducted on two carbon steel plates, one baseline sample and one covered with artificially fabricated marine growth. The results of accelerated corrosion experiments suggest that corrosion-induced ultrasound signals can be detected with satisfactory signal-to-noise ratio using non-contact AE sensors. Ultrasound waves passing through marine growth showed around 12 dB drop in amplitude when compared to the base plate. A localization algorithm for corrosion induced-ultrasound signals was successfully implemented.

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SCORCH JIP - Feedback on MIC and Pitting Corrosion from Field Recovered Mooring Chain Links

Cited by 14 publications

References 12 publications

A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures

A Review of Trends for Corrosion Loss and Pit Depth in Longer-Term Exposures

Mooring of MRE Structures - Comparison of Codes, Including IEC

Non-Contact Acoustic Emission Monitoring of Corrosion under Marine Growth

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