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Hydrogen is one of the main candidates in replacing fossil fuels in the forthcoming years. However, hydrogen technologies must deal with safety aspects due to the specific substance properties. This study aims to provide an overview on the loss of integrity (LOI) of hydrogen equipment, which may lead to serious consequences, such as fires and explosions. Substantial information regarding the hydrogen lifecycle, its properties, and safety related aspects has gathered. Furthermore, focus has placed on the phenomena responsible for the LOI (e.g. hydrogen embrittlement) and material selection for hydrogen services. Moreover, a systematic review on the hydrogen LOI topic has conducted to identify and connect the most relevant and active research group within the topic. In conclusion, a significant dearth of knowledge in material behaviour of hydrogen technologies has highlighted. It is thought that is possible to bridge this gap by strengthening the collaborations between scientists from different research fields. • A systematic review on loss of integrity of hydrogen technologies was conducted. • Loss of integrity phenomena are responsible for several hydrogen accident scenarios. • Material selection may avoid the loss of integrity phenomena formation. • Material science and hydrogen safety are often two separated research fields. • Recent hydrogen accidents demonstrate the need for safety enhancement. [ABSTRACT FROM AUTHOR]

Hydrogen could gradually replace fossil fuels, mitigating the human impact on the environment. However, equipment exposed to hydrogen is subjected to damaging effects due to H 2 absorption and permeation through metals. Hence, inspection activities are necessary to preserve the physical integrity of the containment systems, and the risk-based (RBI) methodology is considered the most beneficial approach. This review aims to provide relevant information regarding hydrogen embrittlement, its effect on materials' properties, and the synergistic interplay of the factors influencing its occurrence. Moreover, an overview of predictive maintenance strategies is presented, focusing on the RBI methodology. A systematic review was carried out to identify examples of the application of RBI to equipment exposed to hydrogenated environments and to identify the most active research groups. In conclusion, a significant lack of knowledge has been highlighted, along with difficulties in applying the RBI methodology for equipment operating in a pure hydrogen environment. • The occurrence of hydrogen-induced material failures requires safety enhancements. • Hydrogen embrittlement relies on a synergistic interplay of several factors. • Tailored inspection activities could aid to monitor equipment exposed to hydrogen. • RBI approaches are not used for planning inspections of hydrogen technologies. • Material science and safety are often considered two separated research fields. [ABSTRACT FROM AUTHOR]