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Wide range of buffering capasity of HLP solution for long term HIC testing under mildly sour condition

Wide range of buffering capasity of HLP solution for long term HIC testing under mildly sour condition
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In linepipes for transportation of natural gas, suppression of hydrogen induced cracking (HIC) caused by H2S contained in the transportation medium is an important issue. HIC is a phenomenon in which hydrogen atoms generated by a corrosion reaction penetrate steel and are accumulated in the central segregation part and inclusions in the steel, internal pressure is increased by gasification, and finally cracks occur.

Product Number: 51322-18078-SG
Author: Daichi Izumi, Junji Shimamura, Nobuyuki Ishikawa, Takuya Hara, Kyono Yasuda, Taishi Fujishiro , Eiji Tada, Mitsuo Kimura
Publication Date: 2022
Industries: Pipelines, Tanks, and Underground Systems , Corrosion Monitoring and Control , Coatings
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$20.00
$20.00

Hydrogen Induced Cracking (HIC) is a major issue of carbon steels for pipelines exposed to wet sour environments. For Fitness-for-Purpose (FFP) HIC evaluations which require a longer test duration than the conventional 96 h, Solution C was registered in NACE TM0284. However, because Solution C requires frequent pH adjustment using HCl and NaOH during HIC testing depending of the sour conditions, there is a strong need for a FFP testing solution with higher pH stability. The High-strength Line Pipe (HLP) Committee of The Iron and Steel Institute of Japan (ISIJ)( 1) proposed a 5.0 wt% NaCl + 0.93N (CH3COOH + CH3COONa) solution (HLP solution).

Hydrogen Induced Cracking (HIC) is a major issue of carbon steels for pipelines exposed to wet sour environments. For Fitness-for-Purpose (FFP) HIC evaluations which require a longer test duration than the conventional 96 h, Solution C was registered in NACE TM0284. However, because Solution C requires frequent pH adjustment using HCl and NaOH during HIC testing depending of the sour conditions, there is a strong need for a FFP testing solution with higher pH stability. The High-strength Line Pipe (HLP) Committee of The Iron and Steel Institute of Japan (ISIJ)( 1) proposed a 5.0 wt% NaCl + 0.93N (CH3COOH + CH3COONa) solution (HLP solution).

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