Corrosion Of The Gas Pipelines Of The Field Medvezhiye In The Different Landscape Types

Michael A Velikotskij,Vadim P Marakhtanov

doi:10.24057/2071-9388-2019-80

Michael A Velikotskij, Vadim P Marakhtanov

Open Access

https://doi.org/10.24057/2071-9388-2019-80

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Abstract

A forecast of the corrosion activity within different landscapes of the cryolithozone is poorly studied previously. This study represent a close correlation between the proportion of corroded sections of the gas pipeline route of the gas field Medvezhye (the North of Western Siberia, Russia) and the deviation of the redox potential of soils (ΔEh) depending on the specific landscape types (tract groups). Our study revealed that the maximum value of the standard deviation of the redox potential (ΔEh) predetermines the maximum currents of the differential pairs aeration of soils that activate electrochemical corrosion processes in pipelines. The value of ΔEh is proposed to use as the main indicator of the activity of corrosion of the landscape types in the permafrost region.

Highlights

The question of the degree of the activity of corrosion of cryolithozone soils for steel pipelines is still debatable
In practice various indicators are used to assess the degree of the activity of corrosion: soil grain size distribution, humidity, ion extract composition of water extract, soil electrical resistance (ρ), acidity index, redox potential (Eh), etc. (State standard GOST 9.602-89.1989) in cryolithozone not all of these indicators have the same significance for assessing the corrosivity of soils
The standard deviation of the redox potential (RP) (ΔEh) is an indicator of the magnitude of the electromotive force of the corrosion process in macrogalvanic vapors arising on pipelines during differential aeration of soils

Summary

Introduction

The question of the degree of the activity of corrosion of cryolithozone soils for steel pipelines is still debatable. In practice various indicators are used to assess the degree of the activity of corrosion: soil grain size distribution, humidity, ion extract composition of water extract, soil electrical resistance (ρ), acidity index (pH), redox potential (Eh), etc. (State standard GOST 9.602-89.1989) in cryolithozone not all of these indicators have the same significance for assessing the corrosivity of soils. All existing assessment of the soil corrosiveness in relation to steel pipelines have been based on the results of experiments in the framework of the «point» models in the laboratory conditions, while the pipes are essentially macro-systems. CORROSION OF THE GAS PIPELINES OF THE FIELD. The authors have performed all relevant studies at the specific object – the gas pipelines of the interfield collector of the gas field Medvezhye in the north of the Tyumen Region (Fig. 1)

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