Análisis condicional y prevención de fallas en válvulas de presión mediante ultrasonido pasivo en el laboratorio de mantenimiento predictivo de la Facultad de Mecánica.

Abstract

This is a comparative study of valves in good condition and valves in bad condition. A test bench was built for the analysis using a valve of several leak diameters so as to simulate an internal in the system. Internal leaks were detected in the compressed air system using the predictive technique of the passive ultrasound to determine the leak ultrasounds. The ABCD method was used, which consisted of measuring two upstream readings called A and B and two downstream readings called C and D. Each leak point was inspected with the passive ultrasound equipment and the spectrum of each leak was analyzed using the spectralyzer software. The parameters such as frequency and amplitude change in each leak diameter. The leak noise was pinpointed, since it is pivotal to be able to hear it when inspecting. A pressure gauge and a pneumatic cylinder were used to calculate the pressure loss in the system. When the piston rod is lowered, it hits the digital weighing scale showing the pneumatic cylinder force in each diameter. We conclude that the passive ultrasound technique is the most efficient when detecting internal leaks in valves allowing us to take precautions.