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ANALYSIS OF THE VIBRATION IN GAS PIPELINE SYSTEM

Li Changjun and Wang Yuchun(Southwest Petroleum Institute)and Wang Yuanchun(Huabei Petroleum Survey and Design Institute)).NATUR.GAS IND.v.20,no.2,pp.80~83,3/25/2000.(ISSN 1000 0976;In Chinese)  
In gas transmission line,vibration will occur due to the interaction of gas medium and pipeline system.Because the vibration of pipeline has a great threat against production and safety,the analysis of this phenomenon is favourable for the rational design and management of pipeline system and for taking reliable vibration proof measures.The main causes of the vibration in pipeline system are in two respects:The first is the vibrant force of the medium acted on pipeline system,i.e.exciting signal,such as the vibrant force caused by the gas flow at the compressor′s inlet and outlet and at the ramified and nodel points as well as the action of pig passing through pipeline bridge,etc.;The second is the response to the exciting signal,which is relating to the characteristics of the pipeline system,i.e.the rigidity,support,quality and equipments of the system besides the waveform of the exciting signal.For analyzing the vibration in gas transmission line system,the change of flow parameters is analyzed first according to the unsteady state flow of the gas in pipeline system and then the acting force of the gas flow on pipeline system is determined,and based on this and in the light of the borne pressure in pipeline system,the vibration is analyzed by using intensive quality method and finally the calculation example is given out.The practice in applying this method shows that the method proposed in this paper can be used for analyzing the vibration in gas transmission station and pipeline..
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