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Since the selection and application of safety-related coatings in commercial US nuclear power plants began in the early 1950's, many changes have occurred in coatings technology, industry understanding of the performance of coatings in the nuclear plant environment, and regulatory oversight of these coatings.
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Extensive and increased collocation of high voltage AC (HVAC) electrical transmission lines, coupled with advances in coating technology, has resulted in the emergence of the possibility of transfer of electrical energy from the HVAC line to paralleling utilities through electrical induction. That transfer of energy can result in safety risks for personnel, as well as corrosion risks for below grade assets. In order to mitigate those risks, operators ground the induced AC using grounding electrodes, typically consisting of bare copper cabling or zinc ribbon.
Erosion is one of the major threats of the pipeline integrity1 when it’s transporting liquid hydrocarbon products with solid particles. The erosion process decreases the effective wall thickness and therefore reduces the capacity of the pipeline to contain the pressured product. This can induce serious consequences including property, health and safety, environment, and business costs.
Most of atmospheric coatings and tank linings for offshore maintenance are routinely applied on rusted steel after dry abrasive blasting. It is well known that the salt contamination on rusted steels cannot be completely removed by dry abrasive blasting alone. Residual salt contamination, which is hidden in the corrosion pits, is difficult to remove mechanically. Depending on the rust severity, the residual salt content on the dry abrasive blasted steel surface can be in the range of 5-65 μg/cm2. Too much residual salt contamination can be detrimental to coating performance. It could cause coating blistering, adhesion degradation, and under film corrosion which will result in a shorter service life, particularly in immersion service such as pipeline coatings or tank linings. Recently wet abrasive blasting (WAB) has been used as the surface preparation in conjunction with the decontamination chemicals.
Understanding the key components that cause osmotic blisters is essential to not only applying the proper concrete floor coating, but potentially walking away from a possible high-risk floor. Resinous floor coatings are organic coatings that have limitations. Coating failures are typically linked to moisture in the concrete slab. This can be a problem for resinous floor coatings that aren't moisture tolerant.
Rebars used in prestressed concrete structures are constantly subjected to tensile stress, and some rebars have been reported to fracture due to hydrogen embrittlement.1 It is important to know the hydrogen embrittlement behavior in rebars to prevent fractures. The effects of environmental conditions such as tensile stress, hydrogen content, and temperature on time to fracture have been evaluated individually;2,3 however, their combined effects have not been clarified. The purpose of this study is to experimentally clarify the relationship between time to fracture due to hydrogen embrittlement and environmental conditions to which the rebars are subjected.
This document captures the key components required to get Thermal spray aluminum (TSA) coating installed by material engineering, project design and execution. These execution details apply to any TSA and insulation system installation whether it is a new construction project or in-plant maintenance project.
Concrete sludge mixing and storage tanks in wastewater treatment plants can be exposed to corrosive environments. Protective linings are the best solution to this problem. But there are a number of design considerations based on this author’s experience that are not readily obvious at the outset.
Protective coatings are used in anaerobic digesters to achieve both corrosion protection and gas tightness. With respect to the need for corrosion protection, anaerobic digesters, under typical operating conditions, do not create exposures which are corrosive to either carbon steel or concrete substrates. This paper will explain the basics of how anaerobic digesters work chemically to stabilize biosolids and demonstrate the atypical operating conditions under which corrosion becomes problematic.
During the last decades, low alloyed steels with improved resistance to Sulfide Stress Cracking (SSC) have been developed for covering specific applications as heavy wall casings1 or expandable tubings2 or for reaching higher mechanical properties, such as 125 ksi Specified Minimum Yield Strength (SMYS) materials.3-6 For the latter, relevant sour environments for developed grades are mild, meaning that all sour applications cannot be covered while a strong interest exists for O&G operators to use high strength materials when designing wells. Consequently, there is an incentive to push the limits of use of high strength sour service steels by enhancing their resistance to SSC. Several recommendations were already published when designing high strength sour service grades: hardness level shall be limited as much as possible and be preferentially below 22 HRC7, microstructure shall present a minimum required amount of martensite8 which is well known to be ideal for combining high mechanical properties and high resistance to hydrogen. Besides, many authors highlighted some other influencing parameters related to the material or the process.
Computerized maintenance painting management programs are used to inventory painted items, maintain historical coating data, optimize the scheduling of painting activities, and develop budget estimates for the work. While the sophisticated programs are quite effective, their true benefit is not realized unless someone takes ownership of the program, updates the data every few years, and uses the wealth of planning information that is available.
To develop a Maintenance Coating Program encompassing cost justification for projects, pre-planning evaluation of safety and quality assurance programs. From two previous NACE Conference Papers.