Flow of gas in pipelines is subject to thermodynamic conditions which produces two-phase bulks (i.e., slugs) within the axial pipeline flow. These moving slugs apply a moving load on the free spanning pipe sections, which consequently undergo variable bending stresses, and flexural deflections. Both the maximum pipeline stress and deflection due to the slug flow loads need to be understood in the design of pipeline spans. However, calculation of a moving mass on a free spanning pipeline is not trivial and the required mathematical model is burdensome for general pipeline design engineering. The work in this paper is intended to investigate the conditions under which simplified analysis would produce a safe pipeline design which can be used by practicing pipeline design engineers. The simulated finite element models presented here prove that replacing the moving mass of the slug by a moving force will produce adequately accurate results at low speeds where the mass of the slug is much smaller than the mass of the pipe section. This result is significant, as the assumption of point load simplifies the analysis to a considerable extent. Since most applications fall within the speed and mass ratio which justify employing this simplified analysis, the work presented here offers a powerful design tool to estimate fatigue stresses and lateral deflections without the need of expensive time-consuming inputs from specialized practitioners.
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February 2019
Research-Article
Pipeline Slug Flow Dynamic Load Characterization
Ahmed Reda,
Ahmed Reda
School of Civil and Mechanical Engineering,
Curtin University,
Perth 6102, WA, Australia
e-mail: reda.ahmed@postgrad.curtin.edu.au
Curtin University,
Perth 6102, WA, Australia
e-mail: reda.ahmed@postgrad.curtin.edu.au
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Gareth L. Forbes,
Gareth L. Forbes
School of Civil and Mechanical Engineering,
Curtin University,
Perth 6102, WA, Australia
e-mail: gareth.forbes@curtin.edu.au
Curtin University,
Perth 6102, WA, Australia
e-mail: gareth.forbes@curtin.edu.au
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Ibrahim A. Sultan,
Ibrahim A. Sultan
School of Science, Engineering
and Information Technology,
Federation University Australia,
Ballarat 3350, VIC, Australia
e-mail: i.sultan@federation.edu.au
and Information Technology,
Federation University Australia,
Ballarat 3350, VIC, Australia
e-mail: i.sultan@federation.edu.au
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Ian M. Howard
Ian M. Howard
School of Civil and Mechanical Engineering,
Curtin University,
Perth 6102, WA, Australia
e-mail: i.howard@curtin.edu.au
Curtin University,
Perth 6102, WA, Australia
e-mail: i.howard@curtin.edu.au
Search for other works by this author on:
Ahmed Reda
School of Civil and Mechanical Engineering,
Curtin University,
Perth 6102, WA, Australia
e-mail: reda.ahmed@postgrad.curtin.edu.au
Curtin University,
Perth 6102, WA, Australia
e-mail: reda.ahmed@postgrad.curtin.edu.au
Gareth L. Forbes
School of Civil and Mechanical Engineering,
Curtin University,
Perth 6102, WA, Australia
e-mail: gareth.forbes@curtin.edu.au
Curtin University,
Perth 6102, WA, Australia
e-mail: gareth.forbes@curtin.edu.au
Ibrahim A. Sultan
School of Science, Engineering
and Information Technology,
Federation University Australia,
Ballarat 3350, VIC, Australia
e-mail: i.sultan@federation.edu.au
and Information Technology,
Federation University Australia,
Ballarat 3350, VIC, Australia
e-mail: i.sultan@federation.edu.au
Ian M. Howard
School of Civil and Mechanical Engineering,
Curtin University,
Perth 6102, WA, Australia
e-mail: i.howard@curtin.edu.au
Curtin University,
Perth 6102, WA, Australia
e-mail: i.howard@curtin.edu.au
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received August 20, 2017; final manuscript received May 22, 2018; published online August 13, 2018. Assoc. Editor: Hagbart S. Alsos.
J. Offshore Mech. Arct. Eng. Feb 2019, 141(1): 011701 (8 pages)
Published Online: August 13, 2018
Article history
Received:
August 20, 2017
Revised:
May 22, 2018
Citation
Reda, A., Forbes, G. L., Sultan, I. A., and Howard, I. M. (August 13, 2018). "Pipeline Slug Flow Dynamic Load Characterization." ASME. J. Offshore Mech. Arct. Eng. February 2019; 141(1): 011701. https://doi.org/10.1115/1.4040414
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