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Precipitation-hardened nickel-based alloys have been used for decades in the oil and gas industry. Among these alloys, UNS1 N07718 has received the most attention for use in upstream applications such as tubing hangers, production stab plate, multiphase flowmeter bodies, and valve stems because of its performance in sour wellbore fluids (SWFs) and hydrogen-charging environments.
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Waterborne polyurethane coatings have been used in the bridge preservation market for years as an alternative to solvent borne systems but early technologies required the bridge coatings engineer to compromise on properties or durability. Additionally, many of these early products still contained high levels of VOC although touted as waterborne technology. New alternatives have evolved that address these issues and fit well into an overall sustainability plan.
In recent years, many tall and large-scale structures have been constructed under harsh environmental conditions. It is required to protect steel structures from a variety of environmental factors over a long period of time. In order to meet such requirements, the increase in durability, extension of lifetime and reduction in life-cycle cost of protective coatings has constantly been the subject of investigations.
Martensitic stainless steels for OCTG materials are widely used in sweet and mild sour conditions. Environmentally-assisted cracking (EAC) is a major corrosion-related issue when using stainless steels as OCTG materials. The EAC in specific oil/gas well conditions with sour environments is defined as sulfide stress cracking (SSC) and stress corrosion cracking (SCC). The SSC is a type of cracking caused by hydrogen embrittlement, which is attributed to a cathodic reaction under acidic conditions, while SCC is associated with an anodic reaction. SSC testing for martensitic stainless steels for OCTG material is often carried out at or near ambient temperature under conditions simulating condensed water, and SCC tests are conducted at higher temperatures under conditions simulating formation water and/or the brine availability test.
In martensitic stainless steel used in H2S-saturated condition SSC is regarded as a main concern rather than SCC in material selection for each specific well condition. In this paper by adding hydrogen embrittlement results at elevated temperature environmentally-assisted cracking (EAC) data of SSC and SCC for are reported by using autoclave-based test results. The test condition is based on (1)temperature of 24C(75F) to 200C(392F) (2)20% and 5% NaCl solution (3)actual YS@in-situ as applied stress in four-point-bend-beam specimens (4)pH3.0@in-situ to pH5.0@in-situ which was adjusted by four factors of (a)partial pressure of 5MPa CO2 (b)partial pressure of 0.01MPa H2S (c)0.5%CH3COOH and CH3COONa addition as pH adjustment and (d)temperature.Judging from the domain maps of EAC for 13%Cr-added to 17%Cr-added martensite-based stainless steel OCTG materials the non-failure domain for each sample is limited by cracking and/or corrosion rate. In terms of cracking as testing temperature is higher each material has higher cracking-resistant. More precisely no SSC (SCC) happens anymore at the higher temperature than SSC (or SCC) begins not to occur when an autoclave test was carried out by elevating temperature from room temperature (24C 75F). In terms of corrosion rate it tends to have the higher value when an autoclave test is carried out at the higher temperature. The stability of passivation and protective surface layer on each stainless steel are related to the resistance for these two parameters. Higher-alloyed martensite-based stainless steel has better performance in both cracking and corrosion rate. In addition it was found that martensitic stainless steel do not have the specific cracking-susceptible temperature range at around 80C to 100C (175F to 210F) temperature which duplex stainless steel are said to specifically fail.
Environment-assisted cracking and corrosion fatigue of aluminum alloys in corrosive atmospheres present significant maintenance and safety issues for aircraft. It is well known that these cracking phenomena result from the combined effects of environment mechanical loads and material properties. The service life of an aircraft structure is dependent on various stages of degradation associated with the deposition of aggressive contaminants formation of corrosion damage crack nucleation and crack propagation. Each of these stages affect the service life of a structure and are dependent on a large number of time dependent factors including environmental severity mechanical loading and protective properties of coatings. This work focuses on quantifying in situ the influence of environmental conditions including cyclic humidity and salt chemistry on the incubation nucleation and growth of cracks under both static and dynamic loads. Two test systems are used in atmospheric corrosion tests to continuously measure crack length and estimate crack growth rates. An instrumented double cantilever beam sample and loading fixture is used to obtain short crack measurements and a hydraulically actuated four point bend sample is used for long crack measurements. The atmospheric testing demonstrates strong hysteresis for aluminum alloy (UNS A97075) crack growth rate with respect to humidity during wetting and drying. The humidity dependence of crack growth rate is a strong function of the hygroscopic properties of the salts and salt mixtures. The maximum crack growth rates are observed below the deliquescence relative humidity during the drying stage of an atmospheric test cycle. Other factors that influence initiation time and crack growth rate including galvanic couples crevices and protective coatings are being investigated.
Tank lining products are necessary for protection of infrastructure and commodities to ensure daily business operations continue smoothly. They are expected to protect the tank from corrosion and chemical attack while maintaining the purity of the tank’s contents; ultimately keeping people and the environment safe from an accidental discharge. Rigorous laboratory testing programs and field trials are conducted to instill confidence the right product is recommended for each task.
Solvent-free epoxy coatings have been widely specified and used over recent years in Australia as linings for a variety of immersion service exposures, specifically for potable water storage and tank linings for some petroleum products. However, they have not always delivered the durability or performance hoped for.
This paper is a case study on a 100% solids epoxy penetrating sealer being used as a tie coat between a tightly adhered latex acrylic and aliphatic polyurethane.
This paper presents an overview of systems available in the market today, their health and safety characteristics, performance capabilities and delivery mechanisms. Installation technologies are analyzed on their energy efficiencies, environmental impact, performance result consistency, ease of use and cost. The goal was to identify currently available systems; analyze concerns and limitations with these systems; and provide a basis for material selection and installation practices to achieve long-term expectations; while maintaining the utmost protection of humans, animals and the environment
Success with the elite sailing world coincided with a renewed interest in the rest of the marine industry to find high performance, non-toxic coatings for commercial and recreational ship hulls. It begged the question of could the technology be applicable to shipping where clean hulls, fuel efficiency and durability are the primary performance requirements.
EPRI has been supporting the nuclear industry over the last several decades to provide the technical bases and research to support the operation of the current fleet of nuclear power plants beyond their initial licensing period (typically 30-40 years of operation). Hundreds of technical reports and guidance documents have been issued on topics ranging from developing and implementing aging management programs, identification, and evaluation of degradation mechanisms, and remaining useful life of key passive components (e.g., reactor vessel internals, cables, and concrete). A previous 2019 ANS Environmental Degradation Conference paper discussed the research goals and results of EPRI up to 2019 for concrete and cables. These research results provide a living technical basis as these results are supplemented regularly with industry operating experience, inspection results, and condition monitoring or non-destructive evaluations.