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The Pigging Power Of Cable-stayed Structure Of The Pipeline Across The Response Analysis

Posted on:2004-05-06Degree:MasterType:Thesis
Country:ChinaCandidate:P XuFull Text:PDF
GTID:2191360095462521Subject:Oil and Gas Storage and Transportation Engineering
Abstract/Summary:PDF Full Text Request
In this paper, analyses for static equilibria of various aerial crossing pipeline structures and dynamic characteristics of cable-stayed bridges are referenced. According to the fluid-induced vibration of cylindrical structure theory, the finite element method is adopted to analyze dynamic response of the aerial crossing pipeline structure supported by inclined cables with vertical expansion joint during the pigging process.The large-scale aerial crossing pipeline structure supported by inclined cables is investigated in the paper. The conveying pipeline is supposed to be a continuous elastic beam, and a finite element analysis model is built considering fluid-solid coupling vibration induced by liquid accumulation filled in the side span during the pigging process.At first, following the Hamilton principle, the fluid-solid coupling vibration equation is established on the side span, in which liquid accumulation is brimming and flows. Then the finite element theory is used to formulate dynamic equations of the whole structure, and the Newmark method is used to calculate dynamic response of the aeria crossing pipeline structure during different pigging processes. This paper presents a linear method for nonlinear behavior of inclined cables. Structure parameters, cable sags and boundary conditions affecting on the structure's natural vibration frequency and vibration modes are given.With a computational program wrote by the ANSYS software, the finite element model is analyzed and calculated in the paper, and the stresses and the vibration displacements of the pipeline are obtained during different pigging processes, when the pig and liquid accumulation pass the aerial crossing pipeline structure. Then the specified criterion of intensity theory is utilized to check the pipeline and inclined cables' safety. Through the analysis, the maximum permissible length of liquid accumulation, which is in the extent of the pipeline and inclined cables's security, is obtained at the definite pigging velocity, and the maximum vibration displacement of the structure is also obtained in that limit condition.The Fujiang gas crossing pipeline structure, which is a representative aerial crossing pipeline structure supported by inclined cables, has been tested on the spot for its dynamic characteristics during the pigging process by the Sichuan Petroleum Prospecting And Design Academy. The required parameters are compared to the calculated results of this paper to verify its accuracy.
Keywords/Search Tags:aerial crossing pipeline structure, inclined cable, pigging, fluid-solid coupling, dynamic response, finite element method
PDF Full Text Request
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