Modelling slug and surge on piping vibration

Hassan, Siti Elya (2021) Modelling slug and surge on piping vibration. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The piping system is the most crucial in the oil and gas industry, and ensuring the smoothness of the system is the target for all engineers involved in this industry. Piping vibration becomes the most crucial problem in the piping system. Among the causes contributing to piping vibration are slug and surge. In this study, slug and surge are modelled by using computational fluid dynamic (CFD) in ANSYS and their effects in piping vibration are simulated through fluid structure interaction (FSI). In order to reduce the piping vibration, the formation of slug flow is mitigated by increasing the velocity of gas and enlarging the diameter of the pipe. It is found that by increasing the gas velocity, the possibility of gas bubbles coalescing and forming a gas pocket at the ceiling of the pipe can be reduced. The vibration of the piping structure is also reduced by enlarging the size of pipe diameter where it helps prevent the mixed-fluid from bridging the pipe as the height of the ceiling increases. The velocity of gas shall not be increased in the larger pipe diameter to avoid the production of unstable and excessive waves that can lead to slug flow.

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