Corrosion Fatigue Behaviour of Cathodically Protected Welded Steel Tubular Joints of Offshore Structures
IR@SERC: CSIR-Structural Engineering Research Centre, Chennai
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Title |
Corrosion Fatigue Behaviour of Cathodically Protected Welded Steel Tubular Joints of Offshore Structures
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Creator |
Gandhi, P.
Raghava, G. Seetharaman, S. Ramachandra Murthy, D.S. Anil Bhardwaj Sankara Rao, S.V.N.S.S. |
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Subject |
Corrosion
Fatigue behaviour Cathodically protected Welded steel tubular Offshore structures |
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Description |
Steel offshore structures are widely used for production and processing of oil and natural gas from offshore areas. In addition to regular sea waves, these structures are subjected to natural hazards like cyclones and hurricanes and also to severe hydrodynamic forces during the monsoon periods. In addition to these natural hazards, these structures would
also undergo severe corrosion which can be viewed as hazard due to environmental exposure. To mitigate the corrosion damage to offshore structures, aluminium alloy sacrificial anodes are used as cathodic protection system. The anodes near the water surface are subjected to severe environmental action since they are in splash zone. The wave force is maximum in this region and there is a possibility of detachment of these anodes, more so during severe cyclonic storms. Often, during inspection, some anodes are found to be detached from the structure and/or missing, hence affecting the corrosion fatigue performance of the structure. An alternative solution to this is the provision of bracelet type of sacrificial anodes which are generally used for offshore pipe lines. With an objective of studying the applicability of bracelet type of sacrificial anodes to offshore jacket structures, detailed analytical and experimental investigations were carried out. Analysis of a typical platform was carried out to find the possible reduction in wave forces due to the use of bracelet anodes near sea water surface in place of stand-off anodes. The experimental studies comprised a static
test on an internally ring-stiffened steel tubular T joint to determine the stress distribution at the joint location and
stress concentration factor for the joint configuration, and, two corrosion fatigue tests on cathodically protected joints, one with flush welded stand-off type sacrificial anodes and the other with half shell bracelet type sacrificial anodes, in synthetic sea water environment. This paper presents the results of analytical and experimental work carried out
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Date |
2009
2009 2007 |
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Type |
Journal article
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Identifier |
Journal of Structural Engineering, Vol.34, No.4, June-July 2007, p.141-147
http://hdl.handle.net/123456789/393 |
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Language |
en
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Rights |
It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
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Publisher |
Structural Engineering Research Center, Chennai
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