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Coating Selection for Transmission and Distribution (T&D) Structures

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Examples of experimental protocols and competitive analyses for coating selection for transmission and distribution (T&D) structures are provided in this paper. The tests were conducted in different electrolytes with painted galvanized and non-galvanized steel including solutions with high chloride soil solutions with different salt concentrations and aqueous solutions using deionized water sea water and corrosivewater etc. The results provide an indication of coating quality and corrosion resistance. Coating evaluation using various combinations of electrochemical impedance spectroscopy (EIS) and other tier testing techniques including cathodic disbondment and cathodic protection shielding is also considered. Finally methods of EIS-based technologies for rapid evaluation of organic coatings are reviewed and case histories in T&D utility industry is presented.Key words: coating selection coating evaluation transmission and distribution structures electrochemical impedance spectroscopy case studies

Product Number: 51319-12813-SG
Author: Mehrooz Zamanzadeh
Publication Date: 2019
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Picture for 51318-10544-Cathodic Protection, Coatings that Shield Cathodic Protection, Stress Corrosion Cracking and Corrosion Assessment in Aging Coated Pipe Lines and Buried Utility Structures
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51318-10544-Cathodic Protection, Coatings that Shield Cathodic Protection, Stress Corrosion Cracking and Corrosion Assessment in Aging Coated Pipe Lines and Buried Utility Structures

Product Number: 51318-10544-SG
Author: Mehrooz Zamanzadeh / George T. Bayer / Anil Kumar Chikkam
Publication Date: 2018
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Here we would like to elaborate on corrosion risk associated with coatings that shield cathodic protection.
Picture for Corrosion Risk Assessment Corrosion Mitigation Strategies and Repair For Aging Weathering Steel Transmission Pole Structures
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Corrosion Risk Assessment Corrosion Mitigation Strategies and Repair For Aging Weathering Steel Transmission Pole Structures

Product Number: 51319-13312-SG
Author: Mehrooz Zamanzadeh
Publication Date: 2019
$20.00

Accelerated corrosion of aging transmission structures in electric power transmission lines is a leading cause of in-service equipment degradation. Each year utility companies spend an increasing amount of their revenue on inspection and refurbishment of corroded structures and maintenance of the large population of aging structures has become a serious engineering and economic problem.As these assets age corrosion at the ground level is becoming a key risk to weathering steel structures as metal thickness loss leads to a reduction in structural strength potential asset failures reduced system reliability and costly repair or replacement. Preventative maintenance for steel structures has quickly become an important topic for engineers to consider both during design and in the field in order to reduce the costs of corrective maintenance many decades later.Accordingly effective and economically feasible corrosion mitigation techniques specifically designed for weathering steel transmission poles are in high demand.In this paper the principal corrosion mechanisms for weathering steel utility pole structures at and below the ground level will be discussed considering specifically; corrosion risk stress calculations FEA analysis corrosion mitigation and repairs.Coating and cathodic protection (CP) are the most effective methods for mitigating corrosion in aging transmission lines rovided that the designer considers the corrosivity of the environment the potential for and mechanisms of cathodic protection shielding characteristics for grounding and soil corrosivity. The potential to which the structure must be polarized also needs to be considered while taking into account the grounding and soil resistivity. This potential determines the degree to which the corrosion rate is reduced below grade.The case history portion of the paper will include actual projects that involved both accelerated corrosion at the ground level coating degradation coating selection and computer aided design for cathodic protection.Key Words: Weathering Steel Transmission Pole Ground-line Corrosion Protective Coatings Ground Sleeves Soil Corrosion Pack-out Corrosion Risk Assessment Cathodic Protection Welding Load Bearing Member FEA Analysis Transmission Structure Repair Protective Maintenance Corrective Maintenance
Picture for 07380 Corrosion Sensors for Detecting Graphitization of Cast Iron in Water Mains
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07380 Corrosion Sensors for Detecting Graphitization of Cast Iron in Water Mains

Product Number: 51300-07380-SG
ISBN: 07380 2007 CP
Author: Mehrooz Zamanzadeh, Gordon Kirkwood, Sam Scheinman, and George T. Bayer
Publication Date: 2007
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