Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Corrosion Control"”.
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GVWD corrosion control initiative, phase II: inhibitor chemical testing at Seymour Dam
… District (GVRD) waters have some of the highest corrosion potentials in North America. A previous pilot study determined that copper corrosion could be reduced by 60 to 80 percent and lead corrosion could be reduced by10 to 60 percent by disinfecting with chloramine instead of chlorine and by …
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Assessing silica and dissolved oxygen effects on copper corrosion control in southern Nevada water treatment and supply system
… to investigate both the effect of silica on the corrosion process in the water system, and the effect of increased oxygen concentration resulting from ozonation on copper corrosion in the water system. The piping system used in the pilot plant resembled a household piping system, and consisted of …
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Lead and Copper Corrosion Control in New Construction: Shock Chlorination, Flushing to Remove Debris & In-line Device Product Testing
… undesirable from health, aesthetic, and corrosion perspectives. Soldering flux is of particular concern due to its corrosive nature. Experiments were conducted to determine the effects of residual solder flux, PVC glue, and metallic debris and to quantify flushing velocities and durations …
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Impact of Premise Plumbing Conditions, Materials, Corrosion Control, Temperature, and Water Heater System Design on the Growth of Opportunistic Pathogens in Drinking Water
… lead exceeding the EPA limit of 15 µg/L after corrosion control was interrupted. Follow-up sampling events between August 2015 and August 2017 demonstrated that the switch back to the original water source and addition of enhanced corrosion control in October 2015, dramatically reduced lead, …
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Phosphate use for Sequestration, Anti-Scaling, and Corrosion Control: Critical Review, Simultaneous Optimization of Polyphosphate Dosing, Sequestration Mechanisms, and Stabilization of Magnesium Silicate Scale
… via threshold inhibition, and 3) reduce corrosion of pipes by forming protective pipe scales. Orthophosphates can control lead, copper and iron corrosion through the formation of durable, low solubility scale, but are widely believed ineffective for sequestration or anti-scaling. …
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Novel Insights into Lead Corrosion Control: Safely Changing Source Waters, Effective Use of Zinc Phosphate Inhibitors, Electrochemical Reversal of Solder, and Significance of Lead-Polyphosphate Complexation
… contamination events arising from lead solder corrosion have drawn attention to our alarmingly inadequate understanding of corrosion control chemistry. This dissertation provides novel contributions to an improved understanding of lead corrosion control in four sequential chapters that: 1) …
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Effects of water chemistry, temperature, gaseous cavitation & phosphate inhibitors on concrete corrosion
Concrete corrosion has serious societal and economic impacts and is an important concern in a utility's overall corrosion control strategy. Though concrete based pipes and linings are only restricted to the distribution mains, they still make up a large percentage of the drinking water …
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HIGH TEMPERATURE KINETICS OF PRECIPITATION AND DISSOLUTION OF FERROUS-CARBONATE
… This information is particularly of interest in corrosion control and in the comparison of FeCO$\sb3$ to CaCO$\sb3$, a compound which has been studied extensively. The enthalpy of the dissolution reaction has been calculated to be $-22.8$ $\pm$ 0.6 kJ/mole, which is close to the NBS (1) reported …
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Effects of Scale Reduction Technologies and Chemical Inhibitors on Calcium Precipitation in Premise Plumbing Systems
… flow reduction, pressure loss, and erosion corrosion damage. Consumers are also concerned with unsightly soap scum, cloudy water, discolored glassware, and failing infrastructure including appliances and fixtures. There are many treatments available that claim to ameliorate scaling problems, …
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Examining Aspects of Copper and Brass Corrosion in Drinking Water
… consequences might be expected in relation to corrosion control when sulfate/chloride ratio, pH, phosphate, iron, aluminum, bicarbonate and organic matter levels are altered. In some cases, these changes will be beneficial and in other detrimental. This research project is the first to …
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Advancing Fundamental Understanding of Lead-Tin Solder Corrosion in Drinking Water: Nitrate Spallation Mechanism, Inhibition by Zinc Orthophosphate and Free Chlorine, and Implications for Canned Foods
… replacing lead service lines, lead-tin solder corrosion control will become increasingly important. Lead-tin solder is often a dominant source of lead in drinking water for homes built before 1986 and has been the source of several recent high-profile water lead contamination events. This …
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Análise da Utilização de Produtos Ambientalmente Amigáveis como Inibidores de Corrosão em Ambientes Contendo CO2
Pipeline internal corrosion is one of the serious problems that occur in the oil and gas industry. The CO2 presence in produced fluids can cause corrosion of the material. The use of inhibitors is one of the most commonly used methods for corrosion control. However, most substances are …
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A Thesis on the Interactions between Lead Pipe Scales and Dissolved Silica from the Addition of Sodium Silicate as a Corrosion Inhibitor
… Addition of sodium silicate can potentially control lead release from lead service lines (LSLs) to the water that they convey, but the mechanism of silica uptake and corrosion control have not been reported. Knowledge of variables which affect the uptake of dissolved silica and the …
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A GEOCHEMICAL MODEL FOR PREDICTING CORROSION- SCALE DISSOLUTION AND PHASE TRANSFORMATIONS IN DRINKING WATER DISTRIBUTION SYSTEMS
… for varying water chemistry conditions and corrosion scale compositions. The equilibrium model is developed in PhreeqC.v.2.16.03 with reactions and thermodynamic constants validated by comparing simulation results with laboratory batch dissolution experiments. The experiments were conducted …
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General reviews of electrochemical and corrosion phenomena under conditions associated with supercritical water oxidation
… highly oxidizing conditions leads to severe corrosion of the process unit for even the most corrosion resistant constructional alloys. Currently, the existence of a constructional material that can withstand the extremely aggressive conditions present in all sections of the SCWO process …
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Addressing gaps in the US EPA Lead and Copper Rule: Developing guidance and improving citizen science tools to mitigate corrosion in public water systems and premise plumbing
… above which utilities must implement systemwide corrosion control. However, gaps in the US EPA LCR leave at least 10% of residents using municipal water and all private well users vulnerable to elevated lead and copper in their drinking water. To help address these gaps in the LCR, this …
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Lead and Copper Contamination in Potable Water: Impacts of Redox Gradients, Water Age, Water Main Pipe Materials and Temperature
… contaminated with lead and copper due to the corrosion of pipes, faucets, and fixtures. The US Environmental Protection Agency Lead and Copper Rule (LCR) is intended to target sampling at high-risk sites to help protect public health by minimizing lead and copper levels in drinking water. The …
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Kinetics of Hydrogen Sulfide Oxidation in Sanitary Sewer Systems
… such as FeCl2, H2O2 and O2 addition as odor and corrosion control alternatives to determine required dosages and detention times. The goal of this research is to study the kinetics of H2S removal using the techniques commonly employed in sanitary sewer systems to determine the effectiveness of …
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The Electrochemistry of Corrosion Inhibitors in the Oil and Gas Industry
For corrosion control in the petroleum industry the use of acid corrosion inhibitors is a necessity. In particular alkynol inhibitors are used in protecting oilfield steels. A future business need is the development of these inhibitors so that they may safely be pushed to higher operating …
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Predicting corrosion on protected buried steel natural gas distribution pipelines
… that corrode instead of the pipeline, to prevent corrosion on its buried steel natural gas pipelines. However, corrosion leaks still occur. This thesis focuses on whether corrosion leaks can be predicted on steel distribution natural gas pipeline that is cathodically protected. By proactively …
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