Candidate: Tiago Murbach Koga
Program: UFSC / POSMEC
Date: March, 2007
Advisor: Victor Juliano De Negri
Co-advisor: Jonny Carlos da Silva
Abstract: The ability to predict the pressure distribution in a pipeline is as important as the ability of predicting clients flow demand. This work presents the development of a pipeline hydrodynamic model to analyze the pressure gradient in a natural gas pipeline under nonstationary conditionals. The lumped parameters model, bond graphs, is a combination of resistive, capacitive, sources and joints elements, applied to analyze transient state behaviors of fluid power, pneumatic, mechanical, electrical and other systems. This work proposes evaluating a natural gas pipeline using the bond graphs method, considering that there is a lack of methodologies for modeling this specific problem in the available literature. In bond graph theory applied to fluidynamics systems, normally potential effects are neglected, however for pipelines altitude effects shall be considered. This work proposes a generalized mathematical model to evaluate this kind of problem taking in account potential, compressibility, viscosity and inertial effects. To evaluate the ability of the lumped parameters method in the prediction of natural gas pipeline behavior, this work analyzed two sections of the Bolivia-Brasil natural gas pipeline network, where the first section is comprised between the compression stations Araucária and Biguaçu and the second one is between the compression station Replan up to Guararema measurement station. The validation of the proposed model is performed by the matching of experimental and predicted pressure and flow demand data. Once validated the model, it was investigated the presence of potentials bottlenecks in the sector Araucária-Biguaçu. This work was developed during the project Segred 2 and was sponsored by Petrobrás and Transportadora Brasileira Gasoduto Bolívia-Brasil.
KOGA, T. M. Modelagem Teórica-Experimental do Escoamento de Gás Natural do Gasoduto Bolívia-Brasil – Trechos Araucária-Biguaçu e Replan-Guararema. 2007. Dissertação (Mestrado em Engenharia Mecânica). Universidade Federal de Santa Catarina, Florianópolis.