During the implementation of a 'Transits and Penetrations' review on the Maersk Oil operated DUC fields in Denmark, the authors jointly undertook a review of the state of the industry through informal communications with a number of Asset and Maintenance Engineers from several offshore operators, discussions with Transit Seal manufacturers and also through the medium of a literature review of the subject. It was recognised that a number of oil, gas and utility operators have reported failures and near-miss experiences on high-criticality pipework due to external corrosion, where the pipework transits through decks and bulkheads. Anecdotal evidence suggests that other Operators have experienced this too, though it has remained either 'officially' un-reported or considered of low significance within their management performance indicators. This paper is based on our experience during the detailed survey of more than 1100 transit and penetration fixtures and the pipes within, including pipes from many different service types, substrate metallurgies and transit construction formats. During the survey the authors identified more than 13% of pipework in these transit fixtures presenting an external corrosion condition beyond that considered acceptable. This condition, if allowed to continue to degrade, could result in potential loss of area or pipe contents containment, service availability or even catastrophic failure of the components. As an indicator for other Operators or Asset Managers we have extrapolated our findings. Our suggestion is that, based on the above percentage, between 13 and 78 transits on each mature asset in the North Sea (not recently inspected) may be at significant risk of failure due to external corrosion on pipes within transits.
Transits & penetrations: the hidden corrosion challenge
Corrosion Management ; 110 ; 14-22
2012
9 Seiten, 28 Bilder, 3 Tabellen
Article (Journal)
English
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