Corrosivity Assessment Of New Gas Transmission Lines

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Product Number: 51321-16973-SG

Author: Yahya T. Al-Janabi

Publication Date: 2021

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The purpose of this study was to perform lab analysis to assess the corrosivity of fluids transported
through three transmission lines from Gas Compression Plants (GCPs) to Gas Plants (GPs), where
CO2 varies from 44 to 55 mol%, and H2S varies from 9 to 40 mol%. The study consisted of four parts:
1) corrosion rate prediction using corrosion modeling; 2) uniform corrosion measurements in liquid and
gas phases; 3) pitting corrosion measurements in liquid and gas phases; and 4) gas phase corrosion
measurements. The highest corrosion rate measured under simulated field conditions was 144 mpy
which is much less than the 1500 mpy obtained by running corrosion prediction modeling (CPM). The
highest water film average wall shear stress estimated by CPM for the three lines was 14 Pa. The
highest corrosion rate value, i.e. 144 mpy, was measured at a wall shear stress of 29 Pa assuming a
worst-case scenario. Pitting attacks were observed under one test conditions in the tests left running
for a period of 14 days. The results show that sweet corrosion rates in the liquid phase are comparable
or higher than sour corrosion rates, while in the gas phase sour corrosion rates are higher than their
sweet counterparts. Unlike CO2, the presence of H2S appears to facilitate wetting of the steel surface in
the gas phase. Gas phase corrosion was studied at low velocities to avoid any water splashing. The
highest measured corrosion rate value in the gas phase was 52 mpy.