Pipes
Mostrando 13-24 de 263 artigos, teses e dissertações.
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13. 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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14. Tensile Armor Wires Submitted to Slow Strain Rate Tests in a Corrosive Environment and Cathodic Protection: a Comparison Between Two Different Microstructures
Tensile armor in flexible pipes consists of two or more layers of steel wires. Damage to the outer sheath may cause ingress of seawater in the annular space and thus corrosion of the armor wires. This work focused on the susceptibility of these wires to stress corrosion cracking (SCC) and hydrogen embrittlement (HE) using a slow strain rate test (SSRT) under
Mat. Res.. Publicado em: 06/05/2019
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15. Use of PVC pipes to determine bulk density for irrigation management
RESUMO A irrigação tem grande importância para a produção de alimentos, sendo responsável por consumir grande parcela da água usada nas atividades humanas. Isto torna fundamental o manejo racional do uso da água. Para tal, a determinação da densidade do solo é importante e precisa ser realizada de forma simples e menos honerosa possível, mantendo
Rev. Ciênc. Agron.. Publicado em: 2019-03
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16. MONITORING OF TRANSPORTATION NETWORK OF CARBONIZATION GASES IN COGENERATION PROJECTS
RESUMO O objetivo desse trabalho foi avaliar o desempenho e a eficiência de um sistema de transporte de gases da carbonização até um queimador. O sistema de transporte de gases da carbonização consiste na retirada destes da chaminé dos fornos, os quais passam por tubulações até atingirem o queimador. Para evitar a condensação dos gases e geraçã
Rev. Árvore. Publicado em: 11/02/2019
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17. Liming on picloram leaching in dystrophic Red Yellow Latosol
RESUMO A prática da calagem pode influenciar a lixiviação de herbicidas nos solos, especialmente os com caráter ácido fraco, como é o caso do picloram. O estudo da lixiviação mantendo-se a estrutura do solo é um fator importante quando se busca compreender a dinâmica de herbicidas e possíveis impactos ambientais. Assim, objetivou-se avaliar o efei
Rev. bras. eng. agríc. ambient.. Publicado em: 2019-02
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18. Pipeline Stress Analysis Through Stress Function Fittings
Abstract This work presents a hybrid experimental technique for stress analysis in pipes due to soil-pipe interaction. It was used a variation of Digital Speckle Pattern Interferometry (DSPI) combined with a small indentation setup for acquiring radial displacement points. Data collected are fitted under the Airy stress functions method for the determination
Lat. Am. j. solids struct.. Publicado em: 17/09/2018
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19. Characterization of Phase Transformations and Microstructural Changes in an API 5CT L80 Steel Grade During Ni Alloy Laser Cladding
The superficial coatings in micro-alloyed steel pipes has been a pointed way to decrease the corrosion problems in oil and gas industry. However, little emphasis has been given to the substrate. The effects of the deposition method on the steel microstructure and properties are still not well described. In this context, this work studied the effect of Ni sup
Mat. Res.. Publicado em: 26/07/2018
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20. Influencia de la temperatura en ensayos de arrancamiento sobre diferentes sistemas epoxi-acero de uso en conectores de ductos flexibles
ABSTRACT In the offshore oil fields located in deep and ultra-deep waters they are used flexible pipes. In many cases inside these pipes, the hydrocarbons are transported at elevated temperatures. At the ends of the flexible pipes are installed end fittings, these are the connection with sea platforms and different subsea systems. In the assembly of end fitt
Matéria (Rio J.). Publicado em: 19/07/2018
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21. Caracterización de resinas epoxi para uso en conectores de ductos flexibles
ABSTRACT In the offshore productions of gas and oil are frequently used flexible pipes. The end fitting is the connection between the flexible pipe body and the production unit, at the assembly of this component is used epoxy resin to fill the free space inside it. This polymeric material holds the tensile armor wires to form the anchoring system. A critical
Matéria (Rio J.). Publicado em: 19/07/2018
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22. Rheo-Squeeze Casting of High-Silicon Aluminium Alloy Pipes with Gradient Structures and Their Mechanical Properties
Three different compositions of high-Si Al alloy pipe, with a gradient structure, were produced through semi-solid rheological squeeze casting, the microstructural characteristics of which were investigated. The mechanism of gradient structure formation and the effect of acicular Fe-rich phases on liquid segregation were revealed. Meanwhile, the crystal stru
Mat. Res.. Publicado em: 11/06/2018
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23. UM ESTUDO TERMODINÂMICO DA CORROSÃO DOS AÇOS CARBONO PELO SULFETO DE HIDROGÊNIO - EXPLORANDO CONCEITOS DE EQUILÍBRIO QUÍMICO
This study addresses an inherent problem to the oil and natural gas exploration and production industry, the corrosion of pipes and tanks by H2S. H2S with water emulsified in the oil or H2S with the water vapor mixed in the gas, they make the acid environment leading to corrosion. This is commonly manifested by the formation of insoluble sulfides on the surf
Quím. Nova. Publicado em: 2018-05
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24. Evaluation of internal corrosion in a Brazilian iron ore slurry pipeline based on the characterization of scales and tubercles
Abstract The transport capacity of long-distance slurry pumping systems is directly related to the roughness of the pipe. In this context, corrosion plays an important role, especially when dealing with old pipes. Chemical, mineralogical and microstructural analyses were performed on materials removed from the internal surface of an iron ore slurry pipeline
REM, Int. Eng. J.. Publicado em: 2018-04