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Test Equipment for Sour TLC Testing

Picture for Test Equipment for Sour TLC Testing
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In this work, a specially made sample holder that can be fitted inside regular autoclaves was used for simulating sour TLC in the presence of methanol. The experiments showed that for 10 bar H2S + 10 bar CO2, the TLC mass loss rate was 0.2-0.3 mm/y of general corrosion without localized attacks.

 

Product Number: 51317--9337-SG
ISBN: 9337 2017 CP
Author: Gaute Svenningsen
Publication Date: 2017
Industry: Science of Corrosion
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$20.00
$20.00

Top of line corrosion has been recognised as a corrosion threat since the 1980ies. Although the first reported cases of TLC were for sour conditions (CO2 + H2S) the major focus has been on sweet TLC (CO2 only). The number of sour TLC failures is limited indicating that this is less common problem than sweet TLC. This explains why sour TLC has been given relatively little attention during the last decades. However several sour TLC failures have been reported in the literature and experimental testing is obviously needed to study the phenomenon.The toxicity and flammability of H2S makes sour corrosion experiments much more difficult to carry out than sweet corrosion experiments. Particularly flow loop experiments would be difficult for TLC testing since the amount of H2S (gas phase) would be large and therefore pose a serious HSE risk in case of leakage and it would also make disposal of the used gas/liquid difficult. Small scale testing in autoclaves is therefore preferred although the flow effects cannot be mimicked.This paper describes test results from a special sample holder used for simulating sour TLC inside autoclaves. The flat corrosion coupon is exposed one side to the moist autoclave environment (H2S CO2 organic acids MEG methanol etc.) and the other side to a circulated glycol solution. Significant heat transfer from the glycol solution to the metal coupon makes it possible to control the surface temperature of the corrosion coupon by varying the temperature of the glycol solution.

Key words: Top of line corrosion, H2S, methanol, test equipment

Top of line corrosion has been recognised as a corrosion threat since the 1980ies. Although the first reported cases of TLC were for sour conditions (CO2 + H2S) the major focus has been on sweet TLC (CO2 only). The number of sour TLC failures is limited indicating that this is less common problem than sweet TLC. This explains why sour TLC has been given relatively little attention during the last decades. However several sour TLC failures have been reported in the literature and experimental testing is obviously needed to study the phenomenon.The toxicity and flammability of H2S makes sour corrosion experiments much more difficult to carry out than sweet corrosion experiments. Particularly flow loop experiments would be difficult for TLC testing since the amount of H2S (gas phase) would be large and therefore pose a serious HSE risk in case of leakage and it would also make disposal of the used gas/liquid difficult. Small scale testing in autoclaves is therefore preferred although the flow effects cannot be mimicked.This paper describes test results from a special sample holder used for simulating sour TLC inside autoclaves. The flat corrosion coupon is exposed one side to the moist autoclave environment (H2S CO2 organic acids MEG methanol etc.) and the other side to a circulated glycol solution. Significant heat transfer from the glycol solution to the metal coupon makes it possible to control the surface temperature of the corrosion coupon by varying the temperature of the glycol solution.

Key words: Top of line corrosion, H2S, methanol, test equipment

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51318-10964-Sour TLC

Product Number: 51318-10964-SG
Author: Gaute Svenningsen / Jon Kvarekvål
Publication Date: 2018
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In this work, sour TLC was systematically studied in autoclaves with a special holder that exposed one side of the TLC coupon while the back side was exposed to cooling liquid.

 
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09288 Control of Top-of-Line Corrosion in a Sour Gas Gathering Pipeline with Corrosion Inhibitors

Product Number: 51300-09288-SG
ISBN: 09288 2009 CP
Author: Rich Martin
Publication Date: 2009
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Thiols as Volatile Corrosion Inhibitors for Top of the Line Corrosion

Product Number: 51317--9096-SG
ISBN: 9096 2017 CP
Author: Zineb Belarbi
Publication Date: 2017
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The effectiveness of hexanethiol, decanethiol and 11-mercaptoundecanoic acid for CO2 corrosion inhibition of carbon steel exposed to top of the line conditions has been investigated. Weight loss measurements were used to measure the corrosion rate.

 
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