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Applicability of High Strength Line Pipe solution has been evaluated by conducting 30-day Hydrogen Induced Cracking (HIC) tests. Reproducibility of corrosion loss and HIC damage was investigated in comparison with those of the conventional solution, specified by NACE TM0284-2016, Solution C.
Hydrogen Induced Cracking (HIC) is a major issue of line pipes exposed to sour environments. High Strength Line Pipe (HLP) Committee of The Iron and Steel Institute of Japan (ISIJ) has investigated Fitness for Purpose (FFP) HIC evaluation method and proposed the 0.93N (CH3COOH+CH3COONa) solution. It was reported that the proposed test solution provided excellent pH stability during HIC test in comparison with the conventional EFC16 solution (0.05N CH3COONa) in our previous papers.In this study long-term performance of the HLP solution was investigated. One month HIC test using the HLP solution and conventional test solution was employed to compare pH stability. Frequent pH readjustment during HIC test is not required when the proposed 0.93N acetate solution is used. Corrosion rate and corrosion morphology were investigated to clarify the influence of high acetate concentration in the HLP solution. Advantage of the proposed solution in practical use condition will be presented and discussed in this paper.
HIC, line pipe, HLP, fit-for-purpose
Resistance testing of low alloyed steel pipes to Hydrogen Induced Cracking (HIC) is performed according to NACE standard TM0284. Fitness-for-purpose testing, where the appropriate environment and pressures are selected, has been included.
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