Author(s)

Guo Junqiang, Liu Dong, Yang Yi

Corresponding Author

Guo Junqiang

Abstract

During operation, the mineral oil pipeline of a compressor at a natural gas transmission station experienced intense vibration. On-site measurements were conducted to assess the vibration parameters of key sections of the mineral oil pipeline under operating conditions. Through a combination of process analysis and theoretical analysis based on Workbench, potential causes such as rotating equipment, cavitation and erosion, as well as resonance between the operating frequency of the pipeline and its natural frequency, were ruled out. Referring to the research paper "Experimental Study on the Influence of Gas-Liquid Flow in Horizontal Bent Pipes on Pipeline Vibration" published by Zhong Xingfu et al. from the Institute of Mechanics, Chinese Academy of Sciences, and combining the on-site troubleshooting results, the cause of pipeline vibration was identified. It was found that gas entrainment in the mineral oil led to significant vibrations in the pipeline when the unit's rotational speed was between 4100rpm and 4700rpm.

Keywords

Mineral oil pipeline; Workbench; Modal analysis; Gas-liquid mixing; Natural frequency