Good practice guide on metrologically traceable quality monitoring in the hydrogen supply chain, including offline measurements and onsite calibration, and recommendations for future improvements of ISO 19880-8 and ISO 21087

This good practice guide was developed as part of the project 21GRD05 Met4H2 “Metrology for the hydrogen supply chain” project. This project is a response to the urgent need to mitigate climate change and to limit greenhouse gas emissions is driving actions to reduce the use of fossil fuels. However, to meet existing and future energy needs necessitates the increased use of alternative energy sources such as, for example, hydrogen. To achieve this goal, the metrological infrastructure for hydrogen needs to address all parts of the supply lines. This guide was developed as part of the activities related to the further development of measurement standards and methods to enable traceable validation and performance evaluation of gas quality measurement methods for hydrogen, to thus improve on the current lack of equivalence for impurities, e.g., oxygen, hydrogen sulfide, moisture content, and for reactive components such as hydrogen chloride and chlorine, as well as the development and improvement of analysers for critical impurities for online monitoring of changes in gas quality, through the supply chain and processing equipment, to ensure the gas quality meets the required specifications as described in, e.g., ISO 14687. For more details about this project, please visit https://met4h2.eu/. Specifically, this good practice guide focuses on online analysis, on-site calibration and validation using reference standards and offline measurements relevant to the hydrogen supply chain. Based on experience of quality monitoring at two different industrial sites and on the results obtained online and offline, this document also includes recommendations for future improvements to ISO 19880-8 and ISO 21087.