10.18710/JXJP0H Rattigan, Wayne Wayne Rattigan Health & Safety Executive, UK Welch, Janet Janet Welch Health & Safety Executive, UK Vizma, Janni Janni Vizma Health & Safety Executive, UK DataverseNO 2025 Engineering Physics Hydrogen Safety Cryogenic Transfer Connection Space H2 LH2 Dispersion Leak Pressure Peaking Ignited Fire Explosion NTNU – Norwegian University of Science and Technology NTNU – Norwegian University of Science and Technology Rattigan, Wayne Wayne Rattigan Health & Safety Executive, UK 2025-06-26 2025-07-01 10.18710/JXJP0H/QWE1BP 10.18710/JXJP0H/BGJOT1 10.18710/JXJP0H/TH8L42 10.18710/JXJP0H/ZIPUAE 10.18710/JXJP0H/MZHOZP 10.18710/JXJP0H/G3FHAE 10.18710/JXJP0H/KVBZOQ 10.18710/JXJP0H/ZCIPW6 10.18710/JXJP0H/5EGYX8 10.18710/JXJP0H/FRPWVE 10.18710/JXJP0H/CUOW5K 10.18710/JXJP0H/C3TJTF 10.18710/JXJP0H/QQLHKZ 10.18710/JXJP0H/KCRN4W 10.18710/JXJP0H/UFN3RC 10.18710/JXJP0H/IOHGRJ 10.18710/JXJP0H/T0C7JL 10.18710/JXJP0H/UP4D8D 10.18710/JXJP0H/UFZJ4I 10.18710/JXJP0H/ZVSCBT 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This dataset contains experimental data for an experimental campaign undertaken as part of the ELVHYS project No. 101101381, supported by the Clean Hydrogen Partnership and its members. HSE participation in Horizon Europe Project ELVHYS is supported by UKRI grant number 10070592. HSE participation is further supported by Lloyd’s Register Foundation. This dataset shows the results from the ELVHYS WP4.2 experiments releasing cryogenic hydrogen into a 1 m3 transfer connection space. Three types of experiments were conducted: dispersion from small horizontal and vertical leaks with nozzle diameters 0.2 - 1.8 mm; pressure peaking phenomena of large LH2 releases with nozzle diameter 25.4 mm; and ignition tests which recreated the dispersion conditions and deliberately ignited the flammable cloud. The tests were conducted at HSE Science & Research Centre in Buxton, UK in Autumn 2024. 48 tests were conducted in total, including some commissioning tests.