FCTM Esope

S1.11 - Fatigue crack characterization of a PSA vessel used for hydrogen purification

Oct 7, 2021 | 11:30 AM - 12:00 PM



Pressure vessels used in gas production units can be submitted to pressure cycles, leading to cyclic fatigue loading and cracking at the location where some stress concentration may occur. When gas is pure hydrogen, its well-known embrittling effects on metallic materials may accelerate the fatigue cracking phenomenon (HEF: hydrogen-enhanced fatigue) and create some challenges to select materials with low sensitivity to hydrogen, and to be able to accurately detect crack-like-flaw defects. This work will present some recent results in NDT method used for detection and characterization of a crack in a hydrogen pressure vessel operated for hydrogen production by steam methane reforming process (SMR). Use of advanced sensors and data treatment may help to identify and properly assess some crack-like defects, ensuring the fitness-for-service (FFS) of the pressure vessel. Phased array technology have largely benefited from data treatment and imaging recent improvement. The study presents results from an ex-service sample subjected to fatigue cracking in hydrogen, and comparative sizing of NDT data with real crack profile.

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