Title: Good practice guide to ensure complete conversion from para to normal hydrogen of vaporized liquified hydrogen
Authors: Günz, Christian, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 7.4, Temperatur
Contributors: HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887
Resource Type: Text / Report
Publisher: Physikalisch-Technische Bundesanstalt (PTB)
Rights: Download for personal/private use only, if your national copyright law allows this kind of use.
Relationships: IsPartOf: ISSN 2751-6598
IsIdenticalTo: ISBN 978-3-944659-24-4
Dates: Available: 2022-11-24
Created: 2022-11
File: Download File (application/pdf) 4.02 MB (4213170 Bytes)
MD5 Checksum: 27e5b2b8ee69366cd6d29f18dc536325
SHA256 Checksum: 0ed3c718ff3a04a781bfc91c8dc1ccb261f732974ec3ad08b45c73ba9807a537
Keywords: Hydrogen ; Flow Measurement ; Hydrous Ferric Oxide ; IONEX ; Ortho Para Conversion ; MetHyInfra
Abstract: This report examines how the two spin isomers of hydrogen, namely para and ortho hydrogen, can influence the measurement of its flow which is of particular interest for vaporized liquid hydrogen. Based on differences in physical properties, flow measurement methods which are affected by the para to ortho ratio are identified. The widely used ortho para catalyst hydrous ferric oxide is introduced and its applicability for the conversion from para to equilibrium hydrogen is discussed. A practical example including the calculation of the required amount of catalyst is given. Alternative approaches to the use of a catalyst as well as measurement methods for the determination of the para to ortho ratio are provided as well.
Series Information: PTB-Bericht M-2
Citation: Günz, C. 2022. Good practice guide to ensure complete conversion from para to normal hydrogen of vaporized liquified hydrogen: A4.3.1: Good practice guide. Braunschweig: PTB Open Access Repository. PTB-Bericht M-2. ISBN 978-3-944659-24-4. Verfügbar unter: https://doi.org/10.7795/110.20221115