Vibration induced fatigue is a common root cause of failures for process piping. Failures can cause harm to human life and the environment and have severe cost implications. Experimental vibration integrity assessments of piping are typically carried out by utilising vibration and dynamic strain measurements in order to quantify the existing integrity threat. This case study shows an alternative assessment approach for process piping at a LNG processing facility (where direct dynamic strain assessment was not possible), in particular how to use experimental vibration data in combination with numerical analysis to predict the dynamic stresses in critical piping areas. This method uses vibration time trend data and frequency based ODS analysis to define numerical analysis boundary conditions. It also shows how the experimental and numerical data can be used to create a localized vibration criterion for the piping, ensuring that local non-expert operators can accurately assess the vibration severity without using specialized strain equipment.
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