Modelagem dinâmica e avaliação do desempenho de atuação hidráulica de uma válvula submarina do tipo esfera visando o monitoramento da condição

Abstract

This dissertation discusses aspects related to the condition monitoring of a subsea ball valve, equipped with a rack and pinion spring return hydraulic actuator. The study considers the monitoring activity by the reading of the hydraulic actuation pressure on the control line, measured during the hydraulic actuation performance test. To this purpose, it was developed a mathematical model that considers the constructive characteristics of an actuator and ball valve assembly, from which information regarding its hydraulic actuation performance, used to calibrate the model, was available. Additionally, the model was implemented taking into account the dynamic aspects, which allowed to evaluate the influence of the actuation speed. Finally, parameters of the hydraulic actuation circuit which may result in pressure drop and possible errors in pressure readings, such as the control umbilical and the restrictions, were verified.