Hydrogen (H2) is the smallest and lightest chemical element in the periodic table. Its molecule is smaller than that of methane and therefore more permeable. In the absence of a standardized test method to verify hydrogen permeability through pipe walls, CENTRALTUBI S.p.A.<\/strong>, in collaboration with RINA CONSULTING \u2013 Centro Studi Materiali S.p.A.<\/strong>, has initiated a testing and analysis campaign using a shared test method to identify the hydrogen permeation volume in gaseous form through polyethylene pipeline networks. This campaign involved testing new pipe samples (PE100) as well as PEAD pipes in service with methane gas for 11 and 19 years, at various concentrations up to 100%. For both types, hydrogen permeability values were found to be higher than those for methane, but lower in terms of energy dissipation, aligning with indications outlined in forthcoming regulatory updates.<\/p>\n<\/div><\/div><\/div><\/div><\/div>