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.
In 2010, mechanical integrity personnel started the application of the Direct Assessment (DA) and Inline Inspection Methodologies (ILI) to establish the integrity validation baseline assessments for a Pipeline Integrity Program (PIP) for the pipelines operated within Blocks 12 and 15 by Petroamazonas EP, in Ecuador.
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.
The monitoring program used in the Danish Sector of the North Sea to manage microbiologically influenced corrosion (MIC) risk assessment for seven pipelines. Quantitative data on microbial activity was obtained from pigging debris using real-time polymerase chain reaction of MIC-causing microorganisms.
Organic coating systems for protection against internal corrosion of pipelines are important to maintain integrity of oil and gas infrastructure. The present investigation focuses on evaluation of protective properties of a set of multiphase coating systems in the environment encountered inside of off-shore natural gas pipelines.
A polyamide 12 (PA12) material has been specifically engineered. After laboratory testing, a significant project was developed to install PA12 in a sour, multiphase, pipeline. Material qualification program is discussed. Performance of the liner in service and inspection of test coupons are described.
There is uncertainty about the best way to determine the corrosion risk for gas-condensate pipelines, and use of chemical inhibitors as mitigation strategy. We present considerations when devising corrosion mitigation and inhibition strategies, as well as a recommended test for inhibitor qualification.
A 22-year-old liquid line experienced an unexpected failure due to internal corrosion after adding the production from one well. Investigation included ILI records, operating pressures and temperatures, oil pressure / volume / temperature (PVT) data, possible flow regimes, failure analysis reports, and mitigation practices.
Corrosion features in energy pipelines can adversely affect the stress/strain state of the pipe body leading to potential integrity concerns. This study demonstrates the application of Reliability-Based Surrogate Models as a means of integrating FEA and reliability analysis in a more reasonable timeframe for integrity programs.