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Featuring Pig Movement in Two-Phase Gas Pipelines

[+] Author Affiliations
David E. G. P. Bueno, Aline Barbosa Figueiredo, Gustavo C. R. Bodstein

Federal University of Rio de Janeiro - UFRJ, Rio de Janeiro, RJ, Brazil

Renan Martins Baptista

Petrobras R&D Center, Rio de Janeiro, RJ, Brazil

Felipe B. F. Rachid

Fluminense Federal University, Niterói, RJ, Brazil

Paper No. IPC2012-90187, pp. 755-764; 10 pages
doi:10.1115/IPC2012-90187
From:
  • 2012 9th International Pipeline Conference
  • Volume 1: Upstream Pipelines; Project Management; Design and Construction; Environment; Facilities Integrity Management; Operations and Maintenance; Pipeline Automation and Measurement
  • Calgary, Alberta, Canada, September 24–28, 2012
  • Conference Sponsors: International Petroleum Technology Institute, Pipeline Division
  • ISBN: 978-0-7918-4512-7
  • Copyright © 2012 by ASME

abstract

This paper presents a mechanical model, along with a numerical scheme for obtaining approximating solutions for the resulting initial-boundary-value problem, for describing the pig movement in transient two-phase gas pipelines. By taking advantage of the best features of the existing models presented in the literature so far, an idealized general purpose pig model is proposed, contemplating the possibility of representing, within a same context, different types of pigs or pig functions. Both mechanical and hydrodynamic friction forces at the interface of the pig and the pipe wall, as well as by-pass flow rates for the liquid and gaseous phases, are naturally incorporated in the modeling in a coherent mechanical context. The governing equations of the two-phase flow model are intentionally written in a general form, so that different existing models can be used within the framework presented herein. Following this same strategy, a detailed numerical scheme is presented in which the discretization of the flux terms are left open, so that different numerical strategies of first or higher orders can be accommodated without any additional difficulties.

Copyright © 2012 by ASME
Topics: Pipelines

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