A method for determining the moisture content of natural gas in pipeline systems

About the authors:

Arambiy A. Paranuk, Cand. Sci. (Tech.), Associate Professor, Department of Gas and Oil Transportation Systems and Equipment of the Oil and Gas Industry, Institute of Oil, Gas and Power Engineering, Kuban State Technological University, Krasnodar, Russia; rambi.paranuk@gmail.com, https://orcid.org/0000-0003-2443-683X

Vladislav I. Dunaev, Dr. Sci. (Phys.-Math.), Professor, Department of Gas and Oil Transportation Systems and Equipment of the Oil and Gas Industry, Institute of Oil, Gas and Power Engineering, Kuban State Technological University, Krasnodar, Russia; dunayev1964@bk.ru, https://orcid.org/0000-0002-4166-6808

Marina G. Prikhodko, Senior Lecturer, Department of Gas and Oil Transportation Systems and Equipment of the Oil and Gas Industry, Institute of Oil, Gas and Power Engineering, Kuban State Technological University, Krasnodar, Russia; aniram-m03@mail.ru, https://orcid.org/0000-0002-7844-0415

Abstract:

This research describes the methodology for determining the moisture content of natural gas in process and main pipelines of various diameters. The work provides an original empirical equation for determining the amount of moisture contained in a unit volume of natural gas. The equation allows you to determine the moisture in natural gas, taking into account the molar fraction of water in the natural gas under study and also the ratio of the molecular masses of natural gas and water.
To increase the accuracy of the proposed equation, the molar fraction of water in the gas is determined precisely at the beginning of the gas pipeline section under study, by direct measurement according to the GOST 34807—2021.
The distribution of temperature and pressure along the length of the gas pipeline is determined using the mathematical model, tested and proven experimentally on various pipelines.
In addition, the proposed multiplier in the moisture content equation makes it possible to determine the type of phase state of natural gas, and can also be an indirect sign of the possible formation of gas hydrates. When compared with direct measurements obtained from existing gas pipelines, the modified formula has a smaller error compared to the classical equation, which is confirmed by the graphs presented in the work.

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