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    5776 The Long-Lasting Operation of Cleaning and Inspecting a Pipeline with Black Powder Issues

    Published: March 01, 2015
    Author(s): Helene Sirnes, Kyrre Klungland, Pipeline Operation Statoil ASA

    The pipeline has been in operation since 1985 and transports a gas rich on hydrocarbons but low in water dew point, within the specifications for dry gas. A cleaning program was identified from the start. In the beginning there were no operational pigging...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)

    5747 Long-Range Microwave Detection of Wet Insulation for CUI Mitigation

    Published: March 01, 2015
    Author(s): F. Simonetti, P.B. Nagy, University of Cincinnati; S.M. Bejjavarapu, G. Instanes, Cincinnati NDE; A.O. Pedersen, ClampOn AS

    Corrosion under insulation (CUI) is a common cause of pipeline failure in the oil and gas industry. Its detection with conventional inspection techniques is challenging due to the presence of the insulation layer and a protective metallic cladding that prevent...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)

    5731 Are We Learning From the Past? Opportunities for Continuous Improvement of Internal Corrosion Management Programs

    Published: March 01, 2015
    Author(s): Richard B. Eckert, DNV GL

    Statistics maintained by the Pipeline and Hazardous Materials Safety Administration (PHMSA) suggest increasing trends in internal corrosion incidents on hazardous liquid and natural gas transmission pipelines in the United States. In spite of improvements in...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)

    5729 Corrosion Management of MIC Contributes to Pipeline Integrity

    Published: March 01, 2015
    Author(s): Richard B. Eckert,Torben Lund Skovhus, Brit Graver, DNV GL

    Microbiologically influenced corrosion (MIC) is one of many potential corrosion threats faced by onshore and offshore pipeline operators. Experience has shown that effective management of the MIC threat is often more elusive and problematic for operators than the...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)

    5675 A Fuzzy Logic Model Designed for Quantitative Risk Analysis Based on ECDA Data

    Published: March 01, 2015
    Author(s): Amauri G. Martins Jr., ENGECORR ENGENHARIA; Elizabeth Nicholson, Cathodic Technology Ltd.

    Describes a fuzzy logic model intended for quantitative risk analysis to the integrity of buried pipelines. The proposed approach correlates data from combined CIPS+DCVG coating surveys to the soil resistivity, in order to define an indicator that expresses the...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)

    5643 Study on Formation Mechanism and Protection Characteristic of Corrosion Scale on X65 Pipeline Steel in CO2 Environment

    Published: March 01, 2015
    Author(s): Liang Wei, Xiaolu Pang, Kewei Gao, University of Science and Technology Beijing

    Carbon dioxide (CO2) corrosion is one of the most serious corrosion problems in oil and gas industry for many years. The corrosion scale formed during CO2 corrosion process plays an important role in the corrosion mechanism of pipeline steels. In this study, the...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)

    5606 Modern AC Mitigation Performance Testing and Comparison

    Published: March 01, 2015
    Author(s): Christopher Sheldon, MATCOR, Inc.

    AC mitigation has become an absolute necessity for pipeline operators due to safety concerns and the risk of through-wall corrosion leaks as a result of induced AC. AC mitigation systems have evolved to use one of three grounding systems: zinc ribbon anode, bare...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)

    5587 Unexpected Effect of Small Oxygen Concentrations in Sales Gas on Element Currents between Pipeline Steel and Magnetite from Black Powder

    Published: March 01, 2015
    Author(s): Guenter Schmitt, IFINKOR; Ruediger Forster, Open Grid Europe GmbH, Gas Quality Competence Centre

    Magnetite as the major part of black powder encountered in transmission pipelines all over the world can form galvanic elements with the pipeline steel, provided a liquid film with some ionic conductivity is present. This galvanic element can exist also in the...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)

    5573 Assessment of Free Water Flow at a Gas Pipeline Dead Leg/Lateral Interface

    Published: March 01, 2015
    Author(s): Kevin Supak, Rebecca Owston, Stuart Stothoff, Xihua He, Kaushik Das, Southwest Research Institute

    In the oil and gas pipeline industry, one way to achieve continued flow while replacing a section of pipe is to introduce a stopple and insert a bypass. However, this process creates two flow-dead legs, which are segments of the original pipeline, typically...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)

    5529 Probabilistic Assessment of External Corrosion Rates in Buried Oil and Gas Pipelines

    Published: March 01, 2015
    Author(s): Swati Jain, Andrea N. Sánchez, Shan Guan, Shanshan Wu, Francois Ayello, Narasi Sridhar, DNV GL; Qingshan Feng, BingChuan Yan, PetroChina Pipeline Company

    Quantitative risk assessment due to external corrosion requires an estimation of corrosion rates which is a challenging task for pipeline engineers because of the uncertainty in data related to environmental and physical variables such as soil type, drainage,...

    Conference paper from Corrosion 2015 Conference Proceedings (NACE International)