Investigation of severe corrosion of mooring chain in West African waters

Emmanuel Fontaine, Andrew E. Potts, Robert E. Melchers, Alberto Arredondo, Kai-tung Ma

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

4 Citations (Scopus)

Abstract

Recent detailed observations of the performance of mooring chains for a floating production unit in tropical West African waters have shown severe localized corrosion (pitting) of the steel chain after only seven years of use. This paper describes the investigation of this phenomenon as part of the Joint Industry Project (JIP) research program SCORCH (Seawater Corrosion of Rope and Chain) funded by the major oil companies, most Classification Societies and various offshore operators and manufacturers. It is shown that there is a high likelihood that the chain has been subject to microbiologically influenced corrosion (MIC) as a result of the elevated levels of water pollution in the operational area. However, despite the large localized loss of steel in corrosion pits, the breaking load shows only a relatively small reduction compared to the Minimum Breaking Load specified in design guidelines.

Original languageEnglish
Title of host publicationThe Proceedings of the Twenty-second (2012) International Offshore and Polar Engineering Conference
Subtitle of host publicationRhodes, Greece, June 17-22, 2012
EditorsHyunWoo Jin, Wentao Cheng, Odd M. Akselsen
Place of PublicationCupertino, California
PublisherInternational Society of Offshore and Polar Engineers
Pages389-394
Number of pages6
Volume4
ISBN (Print)9781880653944
Publication statusPublished - 2012
Externally publishedYes
Event22nd International Offshore and Polar Engineering Conference, ISOPE-2012 - Rhodes, Greece
Duration: 17 Jun 201222 Jun 2012

Conference

Conference22nd International Offshore and Polar Engineering Conference, ISOPE-2012
CountryGreece
CityRhodes
Period17/06/1222/06/12

Keywords

  • Corrosion
  • MIC
  • Microbiological influences
  • Mooring chain
  • Mooring integrity
  • Pitting
  • Reliability

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