الفهرس 
Assessment of pitting corrosion inthin walled pipes
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Abstract
The objective of this thesis is to carry out integrity assessment for corroded pipes using Finite Elements (FE) method by means of shell elements. Shell elements are adopted as a better alternative of solid elements in developing FE models for pitted pipes. Different shell FE models were developed to investigate the accuracy of shell models in predicting remaining pressure carrying capacities of pitted pipes as compared to the available Fitness-For-Service (FFS) codes. Different corrosion defects{u2019} geometries were studied extensively. Studies for single defects and interacting defects were carried out. The results indicated that shell elements are more efficient in the assessment of pitted pipes when compared to solid elements models. The results obtained from FFS codes showed conservative results and inaccurate predictions for interactions between defects as compared to FE results. Such conservative results could lead to unnecessary repair or retire for the corroded pipe while it still can be operated properly and safely. Recommendations for modifications to be carried out for somefaults of the codes are proposed