Analysis of Flow-induced Vibration Based on Discharge Pipeline on Offshore Platform

Abstract

Objective: Because of the widespread use of offshore oil production platforms, there is a large amount of pipeline equipment on them. The excitation generated by fluid flow in the pipeline will cause flow-induced vibration of the pipeline and damage the pipeline structure. As a result, researching the flow-induced vibration of the pipeline is critical. Methods: In this paper, the pipeline on an offshore oil production platform in the South China Sea is taken as the research object, and the calculation and analysis of the pipeline section on the platform are focused on. The fluid-structure coupling method is used to calculate and analyze the pipeline section, and the flow-induced vibration of the pipeline is simulated. Results: Through calculation and analysis, the results show that the vibration speed of the pipeline in its original state exceeds the specified range. To reduce the degree of vibration, the pipeline constraint is redesigned and flow-induced vibration analysis is conducted. The results show that the vibration level meets the requirements. Conclusion: The flow-induced vibration of offshore pipelines is mainly caused by the uneven distribution of pressure in the pipelines caused by gas-liquid two-phase flow in the pipelines, and the reasonable setting of pipeline constraints can effectively reduce the degree of pipeline vibration.