A method has been developed for determination of the maximum allowed aggressiveness of sour media in pipelines of which the steel has a given susceptibility to hydrogen-induced cracking (HIC). The method is based on standard HIC tests and hydrogen permeation experiments, which are correlated to yield a threshold hydrogen concentration below which no cracks will be initiated.

For an API 5L X60 line pipe steel, hydrogen permeation tests were used to qualify sour media of varying composition (water:triethyleneglycol ratio, H2S and CO2 content) as safe or unsafe with respect to HIC and to evaluate the effectiveness of inhibitors with respect to preventing hydrogen from entering the steel.

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National Association of Corrosion Engineers
1986
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