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The previous quality control process at Newport News Shipbuilding for recording surface preparation, paint application, and associated inspections used a paper system. These records required a vast amount of physical storage space, were difficult to research and track due to the complexity of the records often consisting of multiple sheets of data. To address these problems along with others that contribute to inadequate maintenance of objective quality evidence, the company decided to take the initiative in resolving this issue by developing a paperless QA system.
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This paper reviews both available stress corrosion cracking data and test methodologies involving additions of elemental sulfur using several procedures. It utilizes thermodynamic modeling to assess the chemical speciation of elemental sulfur under selected test conditions.
Global demand for hydrogen is growing, increasing to 94 MT in 2021. Most of that consumption came from refining, ammonia and methanol production and direct iron-ore reduction for steel making, but 40 kT was for new applications. Numerous projects around the world have established ambitious goals for increasing hydrogen utilization by 2030 (potentially to around 115 MT), across multiple sectors, including industry, transportation and power.
Additive manufacturing (AM) has allowed for the rapid prototyping of parts and the ability to control the structure of a material and, to a lesser extent, the microstructure. AM as applied to metals, as stainless steel is especially promising as it provides the ability to produce complex shaped components rapidly. Laser-powder bed fusion (L-PBF) is one such technique in which the part is formed from the base up by fusing successive layers of powder. As each layer is fused, the print plate moves down and a new layer of metallic powder is swept over the top. A laser then welds this layer to the top of the existing piece and the process repeats.1 However, AM can result in non-equilibrium microstructures, porosity, and residual stresses that could affect the longevity of the material and performance in corrosive conditions.
In recent years the oil and gas industry has made significant commitments to carbon reduction.1 Aligned with the goal of decreasing carbon emissions the authors have developed a corrosion inhibitor (CI-1) that is intended to protect scCO2 systems that are wet or water contaminated (1000 ppm).2 The development and composition of this corrosion inhibitor (CI) for dry scCO2 is reported elsewhere.2,3 While chemical companies have been treating high water cut, production enhanced, CO2 floods (i.e. enhanced oil recovery [EOR]) for several decades there were no inhibitors designed specifically for CO2 disposal systems or wet scCO2 systems producing CO2 for sale.4
Endospore-producing bacteria are often detected in oilfield produced waters via 16S rRNA identification. Although prevalent in oilfield brines little is known about their significance and potential implications on microbial control efforts. The presence of noxious chemicals and subsequent chemical damage can force a capable cell into an endospore a dormant structure that preserves the cellular genetic material. As extracellular conditions improve such as the dilution or removal of antimicrobials the endospore again becomes a vegetative cell. These endospores are largely impervious to and are not readily eradicated by antimicrobial agents. Here commonly used microbiocide chemistries are applied in differing concentrations and contact times in order to evaluate the cellular response scored as cell survival endospore formation or cell death. Outcomes were determined utilizing the schaeffer-fulton method for endospore staining and a fluorescence assay of bacterial viability based upon membrane integrity. Treatments are applied to cultured Bacillus subtilis the laboratory model organism commonly utilized to study endospore formation as well as unadulterated produced water containing members of the Phylum Firmicutes including the endospore capable Geobacillus stearothermophilus. Results indicate that the presence of a large population of endospore-forming bacteria may explain the failure of some microbiocide applications.
After decades of use, it is becoming evident that the standard practice ASTM D2992 and referenced Standard test Method ASTM D1598 may not be producing the intended results.
Contractors who apply coatings as a water resistive and air barriers for a wall assembly will be more effective if they understand the basic building science principals behind bulk water intrusion in walls. Understanding the leak triangle and utilizing he Three ‘D’ approach – Deflect, Drain, Dry – will help the contractor be more effective in analyzing problems and recommending solutions.