Liquid displacement from lower section of hilly-terrain natural gas pipelines

E. Hamami Bissor*, A. Ullmann, N. Brauner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Offshore gas fields are challenged by liquid accumulation at lower sections of the hilly-terrain pipelines. To enhance flow assurance, complete purge-out of the liquid by the gas flow is desired. Experiments in atmospheric air-water system are used to determine the critical flow rates leading to purge-out. Several flow patterns are observed as a function of the up-comer inclination angle, gas flow rate and the initial liquid volume. These flow characteristics and the critical flow rates are adequately predicted by 2D numerical simulations. A simple scaling rule is suggested for using low-pressure data for evaluating the critical gas flow-rate at high-pressures typical to natural-gas pipelines. The validity of the scaling-rule predictions is verified by the simulation results. The gas flow-rate for the complete purge of liquid is found to be independent of the initial volume of the trapped liquid, however, increases with the up-comer inclination.

Original languageEnglish
Article number103046
JournalJournal of Natural Gas Science and Engineering
StatePublished - Jan 2020


FundersFunder number
Ministry of National Infrastructure, Energy and Water Resources217-17-003


    • Accumulated liquid purge-out
    • Flow assurance
    • Gas-liquid flow
    • Hilly-terrain pipelines
    • Natural gas


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