A NUMERICAL MODEL ABOUT THE DYNAMIC （一个数值模型的动态）.pdfVIP

Proceedings of ENCIT 2008 12th Brazilian Congress of Thermal Engineering and Sciences Copyright © 2008 by ABCM November 10-14, 2008, Belo Horizonte, MG A NUMERICAL MODEL ABOUT THE DYNAMIC BEHAVIOR OF A PRESSURE RELIEF VALVE A. J. Ortega, arturo@.br B. N. Azevedo, bruno_n_azevedo@aluno.puc-rio.br L. F. G. Pires, lpires@.br A. O. Nieckele, nieckele@puc-rio.br L. F. A. Azevedo, Lfaa@puc-rio.br Pipeline Thermo-Hydraulic Simulation Group – Mechanical Engineering Department – PUC/Rio Rua Marques de São Vicente 225 – Gávea, CEP 22453-900, Rio de Janeiro, RJ, Brazil. Abstract. Pressure relief valve is one of the most important devices used on the security of pipelines, since it is responsible to guarantee the integrity of the installations. Generally, the response and behavior of a relief valve during its transient is unknown by users, who employ simplified and static analysis to design the pipeline, further, the information provided by manufactures is limited. In this work, a numerical dynamic model of a spring load pressure relief valve was developed using the principles of conservation of mass and momentum in combination with solid dynamics equation. The valve discharge coefficient was numerically determined by employing a simplified two- dimensional model with FLUENT. The dynamic characteristics of the valve were examined with regard to the pressure set point, disc lift and spring parameters, during the transient discharge flow. Keywords : Pressure relief valve, dynamic characteristics, transient discharge flow. 1. INTRODUCTION Relief and safety valves are fundamental equipments for oil and gas pipelines