Materials Performance

OCT 2017

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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A22 OCTOBER 2017 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 56, NO. 10 WEDNESDAY, APRIL 18 Environmentally Assisted Cracking of High-Strength Steels and Alloys for Critical Service Subsea Bolting [with and without Cathodic Charging] Presented by: Dr. Russell Kane, iCorrosion LLC; Khlefa Esklul, Occidental Petrolum; Tim Haber, GE Oil & Gas; and John Scully, University of Virginia Based on recent service experience there is concern for critical subsea bolting and fasteners and their risk of failure as observed in recent near-miss incidents in sea-bottom drill-through equipment. Evidence suggests that these events were associated with environmental cracking in high-strength (hardness) materials by hydrogen embrittlement because of either (a) internal hydrogen from manufacturing or electrolytic application of protective coatings, and/or (b) external hydrogen from in-service cathodic protection (CP) from galvanic and/or impressed current systems. There is also an additional yet only partially assessed concern that other environmental cracking mechanisms (e.g., chloride stress corrosion cracking, sulfide stress cracking, liquid metal embrittlement) can also induce embrittlement in certain high-strength bolting materials under subsea conditions. This panel discussion will highlight the background of the abovementioned subsea bolting problems with details of the in- service bolting failures experienced to date and the initial industry review and API-led standardization activities that followed these events. The focus of these activities was directed on materials processing, hardness control, equipment design, and stress reduction with only a minor consideration of the corrosion factors that relate to quantification of the subsea CP conditions and their relationship to environmental cracking severity in high-strength bolting. The panelists will handle questions from the audience and discuss an approach for minimizing environmental cracking failures in high- strength/hardness materials used in subsea operations through the NACE technical committee and standardization processes. The approach being considered is like that found successful for providing guidelines for evaluation, qualification, and selection of materials for H 2 S service in oilfield applications. Possibilities include: § A NACE Materials Requirement (MR) document that provides acceptable materials and metallurgical conditions for the selection and qualification of metallic materials for use in seawater with and without CP or galvanic coupling. § A NACE Test Method (TM) document that provides standardized tests for determining the resistance of metallic materials to environmentally assisted cracking (EAC) in seawater, with and without CP or galvanic coupling. § A regularly scheduled NACE symposium on the EACS behavior of metallic materials in seawater with and without CP or galvanic coupling. Forums Prognostics and Health Management Technologies for Corrosion Processes Presented by: Prof. George Vachtsevanos, Georgia Tech and Jeff Bird, PHM Society The board of directors of the Prognostics and Health Management Society propose to organize an advanced panel on novel technologies for corrosion data/image processing, feature, or condition indicator (CI) extraction and selection, corrosion initiation detection and identification, and prediction of local and global corrosion growth/propagation. Recent advances in corrosion mitigation technologies have focused on the development and application of coating materials aimed to inhibit the corrosion growth. Aging aircraft and industrial processes are subjected to the detrimental effects of corrosion, with corrosion prevention amounting to billions of dollars each year. There is a recognized need to develop and implement technologies that will assist in the expedient and early detection of corrosion. The panel members will discuss recent advances in corrosion sensing for aerospace and industrial processes, modeling methods for accurate representation of corrosion processes, corrosion detection methods with confidence/ accuracy, and an architecture to predict corrosion growth. Test cases from a variety of industrial and aerospace systems will be used for demonstration purposes. The Future of NACE MR0175/ISO 15156: Proposed Changes for a Path Forward Presented by: Robert Badrak, Weatherford The existing structure of NACE MR0175/ISO 15156 standard has not changed since the translation from the historical NACE MR0175 culminating in the December 2003 publication of the final Parts 2 and 3. Our standard has been undergoing a critical review as to whether it should be rewritten to better serve the oil and gas industry. The NACE MR0175/ISO 15156 Maintenance Panel (MP) has been wrestling with this subject for about a year and has developed an initial proposed new structure. The purpose of this forum is to present the work of the MP and solicit feedback and discussions for the path forward. Challenges of Designing and Installing Cathodic Protection for Buried Piping at Nuclear Power Plants Presented by: Eric Bonner, Pond & Co. Most cathodic protection (CP) applications are associated with the oil and gas market and NACE SP0169 is typically used as the appropriate technical guidance. However, nuclear power plants introduce a multitude of very challenging scenarios that may not be appropriate for current NACE guidelines. A Task Group (TG 404) is developing a guidance document specific to the design, installation, and maintenance of CP within nuclear power plants. This presentation will provide a series of case studies and outline the numerous challenges associated with providing corrosion control for buried piping within a nuclear facility. Further, solutions to these challenges will be discussed as well as the new TG 404 guidance document.

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