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 35 for “"Plumbing Systems"”.
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Decision Support Tool for Optimal Replacement of Plumbing Systems
Pinhole corrosion leak in home plumbing has emerged as a significant issue. In the major water distribution system managed by municipalities and water utilities the costs are distributed among all subscribers. The home plumbing repair/replacement cost and possible water damage cost must be …
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An Evaluation and Pressure-Driven Design of Potable Water Plumbing Systems
Potable water distribution systems are broken into major and minor distribution networks. Major water distribution networks refer to large-scale municipal pipe systems extending from the treatment plant to the upstream node of the water service line for buildings. Minor water distribution systems, …
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Water Hammer: An Analysis of Plumbing Systems, Intrusion, and Pump Operation
… look at water hammer with an emphasis on home plumbing systems. The mathematics of water hammer are explained, including the momentum and continuity equations for conduits, system construction, and the four-point implicit finite difference scheme to numerically solve the problem. This paper …
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Relationship Between Organic Carbon and Opportunistic Pathogens in Simulated Premise Plumbing Systems
… to opportunistic pathogens in potable water systems poses a significant challenge to public health as manifested by numerous cases of pneumonia, non-tuberculosis lung disease, and keratitis eye infections. Water utilities have extensive understanding in control of heterotrophic and coliform …
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Effects of Scale Reduction Technologies and Chemical Inhibitors on Calcium Precipitation in Premise Plumbing Systems
Precipitation of solids in plumbing systems (i.e., scaling) is a major problem in both traditional tank (electric and gas) and tank-less building hot water systems. Scaling can cause energy inefficiencies, flow reduction, pressure loss, and erosion corrosion damage. Consumers are also concerned …
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Limitations to Use Copper as an Antimicrobial Control of Legionella in Potable Water Plumbing Systems
… characteristic of premise (i.e., building) plumbing systems, making it challenging to identify effective interventions for its control. Copper (Cu) is a promising antimicrobial that can be dosed directly to water via copper-silver ionization systems or released naturally via corrosion of Cu …
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Dezincification and Brass Lead Leaching in Premise Plumbing Systems: Effects of Alloy, Physical Conditions and Water Chemistry
… are widely used in drinking water distribution systems as valves, faucets and other fixtures. They can be corroded by "dezincification," which is the selective leaching of zinc from the alloy. Dezincification in potable water systems has important practical consequences that include clogged …
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An Assessment and Modeling of Copper Plumbing pipe Failures due to Pinhole Leaks
Pinhole leaks in copper plumbing pipes are a big concern for the homeowners. The problem is spread across the nation and remains a threat to plumbing systems of all ages. Due to the absence of a single acceptable mechanistic theory no preventive measure is available to date. Most of the present …
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Adherence and Biofilm Formation of Mycobacterium avium, Mycobacterium intracellulare, and Mycobacterium abscessus in household plumbing
… and found in drinking water distribution systems and household plumbing. They are opportunistic pathogens of humans, causing lung disease. Their ability to adhere and form biofilm is attributed to a waxy, lipid-rich, cell envelope. This highly hydrophobic envelope also contributes to the …
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Organic Carbon Generation Mechanisms in Main and Premise Distribution Systems
… to growth of microbes, including pathogens, in plumbing systems. Two phases of research were completed to improve knowledge of AOC and other forms of organic carbon in premise plumbing. In the first phase, the AOC Standard Method 9217B was compared to a new luminescence-based AOC in terms of …
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Documenting the Origin of Compositional Diversity of Subduction Zone Magmatism, Alicudi, Aeolian Arc (Southern Tyrrhenian Sea, Italy) Using in situ Plagioclase Data
… geochemical constraints of magma formation in plumbing systems enhances eruption prediction and hazard mitigation.</p>
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Opportunistic Pathogens and the Brain-eating Amoeba, Naegleria fowleri in Reclaimed Water, Municipal Drinking Water, and Private Well Water
… (i.e., non-potable recycled water) distribution systems, with aerosol inhalation and other non-ingestion exposures that are not addressed by existing regulatory frameworks. Factors enabling the growth of OPs in water distribution and premise (i.e., building) plumbing systems distributing …
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Magmatic processes at basaltic volcanoes: insights from the crystal cargo
… to eruption. Magma reservoirs are complex, open systems, and often multiple reservoirs are partially inter-connected from source to surface, giving rise to the term 'volcanic plumbing system'. Parental melts feeding these reservoirs can have diverse and distinct geochemical and petrological …
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Effects of installing point-of-use filters intended for lead removal on drinking water quality
… that pose a risk to human health. Premise plumbing systems can be sites of elevated lead concentrations from lead service lines and are favorable environments for biofilm-forming opportunistic pathogens. To comply with state law requiring no more than 5 parts per billion (ppb) of lead in …
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Silicon processing for microfluidic neuroprobes
… Packaging processes for the neuroprobe with plumbing systems are also developed and described in this work. The silicon processing steps and packaging method described in this thesis will help lead to the completion of the high-performing silicon-based neurochemical probe that will aid in …
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Microanalytical Constraints on the Geometry and Chemical Evolution of Kīlauea’s Volcanic Plumbing System
… paradigm shift in our understanding of volcanic plumbing systems, moving away from a model where large vats of melt are stored in the crust, to a model dominated by extensive piles of settled crystals. This thesis examines the petrological evidence for this ‘mush-dominated’ model at Kīlauea …
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Growth of Opportunistic Pathogens in Domestic Plumbing: Building Standards, System Operation, and Design
… of OP survival and proliferation in domestic plumbing systems. In a cross-sectional survey of water- and energy-efficient buildings, domestic water age ranged from 8 days to 6 months and resulted in pH and temperature fluctuations, rapid disinfectant residual decay up to 144 times faster than …
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Occurrence and Control of Microbial Contaminants of Emerging Concern through the Urban Water Cycle: Molecular Profiling of Opportunistic Pathogens and Antibiotic Resistance
… occurrence of OPs and ARGs across these water systems and highlights trends that may be of value in developing management strategies for limiting their regrowth and transmission. Field studies of two surface water catchments impacted by stormwater runoff demonstrated the prevalence of ARGs in …
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Chloride Sulfate Mass Ratio (CSMR) and Nitrate Acceleration of Galvanic Lead- Bearing Solder Corrosion
Lead corrosion in premise plumbing systems from materials, such as lead pipes, soldered joints, and brass, can cause elevated lead in drinking water. This work examined mechanisms by which galvanic corrosion of lead solder:copper joints is accelerated by high chloride, low sulfate, and high nitrate …
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Evidence From High Ni Olivine For Diverse Primitive Magmas In Cascade Volcanism
… and crustal contamination in shallow volcanic plumbing systems. The propinquity of these distinctive primitive lava types along the length of the arc suggests that a thermally and compositionally heterogeneous mantle wedge probably exists beneath most of the Cascade Range. Additionally, the …
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