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Inspection of offshore pipelines is essential to provide vital information required for integrity assessment to allow data driven engineering decisions to be made and prevent costly failures. This paper presents experience from applying Internal Corrosion Direct Assessment (ICDA) for offshore pipelines in the North Sea.
Authors: Eugene Ogosi (Pipelines Corrosion Engineer) James Saunderson (Pipelines Technical Authority)Inspection of offshore pipelines is essential to provide vital information required for integrity assessment to allow data driven engineering decisions to be made and prevent costly failures. To identify and quantify anomalous features and defects including internal corrosion damage it is common to use inline inspection (ILI) pigs.Conventional ILI requires deployment of a tool which has a combination of characteristics that allow the passage of a free-swimming assembly through the pipeline without disruption to normal operation. However some pipelines deviate from conventionally "piggable" pipelines so inspection for internal corrosion could be complex and/or unfeasible. To establish the integrity ofthese dificult to pig pipelines Internal Corrosion Direct Assessments has been performed to ascertain the condition of these pipelines with considerable success.This paper presents experience from applying Internal Corrosion Direct Assessment (ICDA) for offshore pipelines in the North Sea. The paper focuses on how these assessments have been performed challenges experienced results and lessons learnt.Key words: Inline Inspection Corrosion Pigging defects etc
This work applied the Wet Gas-Internal Corrosion Direct Assessment (WG-ICDA) standard to assess the severity of internal corrosion of 2 segments along a pipeline used to transport wet gas from a gas mine.
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Bayesian networks (BN) are useful tools for corrosion modeling. This paper is a case study demonstrating how to perform Internal Corrosion Direct Assessment (ICDA) using BN modeling with limited data. A BN model was developed for ICDA of a 50 km refined oil pipeline. Internal corrosion probability of failure along the pipeline was assessed.
The study presents the internal corrosion direct assessment (ICDA) of a 48” x 18.7 km liquid petroleum pipeline carrying crude oil from a subsea pipeline end manifold (PLEM) to the onshore crude oil tank facilities.