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Service and design life estimates are converging for many transmission and distribution assets. This report provides an approach to understanding the significance of reject and ranking criteria and how they may become a barrier to good asset management or a path to improving system reliability and grid resiliency.
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In a previous investigation, AC corrosion rate data from weight loss experiments was compared with the results from a model for AC corrosion developed using a modified Butler-Volmer approach. In the present work, an extension of this is presented to investigate the influence of scale formation on AC corrosion rates.
We have used thermodynamic modeling to predict the chemical composition of the brines that form by deliquescence of sea-salt aerosols, and to estimate brine volumes and salt/brine volume ratios as a function of temperature and atmospheric relative humidity.
The goal of The Nuclear Energy Agency (NEA) is to assist its member countries in ensuring safety, through regulation and oversight of nuclear installations, and to preserve the scientific and technological knowledge base.
An artificial geothermal water was used to investigate the performance of high alloyed materials. The electrolyte has pH 4 and contains 1,500 mg/l Cl-, 20 mg/l SO42-, 15 mg/l HCO3-, 200 mg/l Ca2+, 250 mg/l K+, and 600 mg/l Na+.
A comparative assessment of electrochemical properties of common AC mitigation materials, and assessment of common industry claims with respect to AC mitigation grounding. Provides the corrosion test data and technical information to support a decision for mitigation material selection.
AC current density (rather than voltage alone) should always be the factor considered when assessing susceptibility to AC corrosion. Also presented are analyses used in assessing the metal loss features and the comparison of site-specific data.
Slow strain rate tests were conducted to study the SCC behavior of plain and welded UNS K02700 grade mild steel exposed to an artificial concrete pore water solution. Tests were performed under anoxic conditions at 140°C, a constant strain rate of 5 × 10-7 s-1 and open circuit potential.
This paper highlights plant processes and systems where these programs are leveraged, driving corrosion and integrity concerns, inspection and monitoring plans, trending and forecasting tools, and long-term asset integrity investment considerations.
Frequency dependence of the phase relation of the power line currents (which contain harmonics of the fundamental AC frequency), the Earth response, and the pipeline response & how they can be combined to provide an AC risk assessment.
A case history is presented to illustrate how assessment data was collected, interpreted, and used to develop and implement repair strategies for two 400 foot (121 m) tall hyperbolic shell cooling towers exhibiting widespread corrosion-induced deterioration.
Nuclear wastes are stored in large carbon steel storage tanks. Carbon steels can become susceptible to localized corrosion and stress corrosion cracking. Results of ongoing electrochemical tests to understand effects of a maturing passive film on the corrosion.