Polyethylene Pipes
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Head loss in laser-perforated thin-walled polyethylene pipes for irrigation
RESUMO Para reduzir custos fixos e operacionais em sistemas de irrigação pressurizados são produzidos tubos de polietileno com pequena espessura de parede, com orifícios de descarga perfurados a laser, que operam a baixas pressões (até 100 kPa). A caracterização hidráulica desses materiais é essencial para o dimensionamento dos sistemas de irrigaç
Rev. bras. eng. agríc. ambient.. Publicado em: 06/05/2019
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2. Modelo para determinação da perda de carga contínua em tubos elásticos / Model for determining the continuous head losses in elastic pipe
Total head losses are accounted in the irrigation hydraulic projects, that would be the continuous losses and the local head losses, aiming to maximize the uniformity of water distribution, characterizing an adequate pump set to the irrigation system e thus, minimizing the project implantation and annual costs. With informatics support, complex calculation p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2011
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3. Fracture mechanics methods applied to medium density polyethylene designed for extrusion of pipes. / Métodos de mecânica da fratura aplicados a polietileno de média densidade destinado à extrusão de tubos.
Medium density polyethylene (MDPE) is a semicrystalline thermoplastic polymer that has been increasingly used in engineering applications, as plastic pipes for water and gas distribution systems. Under constant load, however, this material may occasionally present creep failure, by means of a mechanism of slow crack growth, leading to leakage losses in the s
Publicado em: 2009
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4. Avaliação de algumas propriedades físico-químicas de alguns materiais retrobturadores / Evaluation of some physicochemical properties of retrograde filling
Some properties had been evaluated physicochemical, such as pH, release of calcium ions, setting time, solubility and radiopacity of 3 retrograde filling the base of the aggregate of mineral trioxide, to clínquer of the Portland cement and an experimental epoxy sealer. Experimental cements MTA white Angelus, MTA Bio, light-curing MTA and Sealepox RP and the
Publicado em: 2009
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5. Modificação do LLDPE através de silanos viabilizando a aplicação em camadas plásticas de linhas flexíveis / Study of silane grafting reactions of low density polyethylene for pipe applications
The flexible lines are flexible structures manufactured through plastic and steel layers that allows its use in order to permit fluid flow in exploration and production of hydrocarbon between offshore oil units and sea bed and/or coast. Nowadays these pipes are one of the main ways to permit the exploration of hydrocarbon in deepwater. The present study aims
Publicado em: 2009
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6. Project and assembling of pneumatic transport pilot unit in diluted phase for studying the relationship between the pressure drop and the distribution of granular particles into the cross section of industrial pipes / Projeto e montagem de unidade piloto de transporte pneumatico em fase diluida para estudo da relação entre a perda de carga e a distribuição de particulas granulares na seção transversal de dutos industriais
The pneumatic transport that involves the use of air particles to move materials through pipes is a major operation in various industries and chemical processes. Typical examples are systems for the conversion of energy from coal, catalytic cracking, drying and transport of solid and fine granular. The conventional pneumatic transport is often operated in di
Publicado em: 2009
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7. Perda localizada de carga em gotejadores integrados em tubos de polietileno / Local head losses for integrated drippers in polyethylene pipes
A inserção de gotejadores em uma tubulação modifica as linhas de fluxo, provocando turbulência local, que resulta em perdas de carga adicionais maiores que as perdas contínuas na tubulação. Para avaliar a perda total de carga, ao longo da linha lateral de gotejadores, as perdas contínuas e as localizadas, devidas à presença dos emissores no tubo,
Publicado em: 2009
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8. Abrasão, desgaste e atrito sob deslizamento de recobrimentos preparados por aspersão térmica a partir de PET pós-consumo
This work intends to contribute to the development of polymer coatings by combustion thermal spraying of recycled poly(ethylene terephthalate) PET for the improvement of the tribological behavior of carbon steel piping. Coatings with high wear resistance may reduce corrosion, the formation of organic and inorganic deposits, and the friction of the transporte
Publicado em: 2008
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9. Índice geométrico na determinação da perda de carga localizada em conexão de emissores sobre tubos de polietileno de pequenos diâmetros / Geometrical Index in the determination of head losses located in connection of emitters on polyethylene pipes of small diameters
O procedimento de dimensionamento de uma linha lateral de microirrigação necessita avaliar com precisão as perdas de carga distribuídas na tubulação e as perdas de carga localizadas nas inserções dos emissores com os tubos. Estas perdas localizadas podem ser significativas quando comparadas com as perdas de carga totais, devido ao grande número de e
Publicado em: 2007
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10. Development of alternative methods to the assessment of the creep fracture resistance of polyethylene resins used for the extrusion of water pipes. / Desenvolvimento de métodos alternativos para a avaliação da resistência à fratura por fluência de resinas de polietileno utilizadas para a extrusão de tubos de água.
Polyethylene has been largely used in potable water distribution systems, mainly in service lines. This polymer offers many advantages over its competitors: flexibility, low cost, ease installation and corrosion resistance. Pipes made with high density polyethylene HDPE, the generic designation of the material in the sanitation industry in Brazil fail
Publicado em: 2005
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11. Comportamento biológico do tecido conjuntivo submucoso ao implante do agregado trióxido mineral e do cimento portland: estudo experimental em ratos.
Due to similarity between the chemical composition of the Mineral Trioxide Aggregate (MTA) and the Portland cement, some researches have being done to become viable the dentistry use of the Portland cement. The aim of the present study was to evaluate the biological behavior of the submucous conjunctive tissue of rats, to the implantation of polyethylene pip
Publicado em: 2004