Abstract in Englisch:

n this paper, the challenges of compressing hydrogen (H2)for transportation mainly in pipelines utilizing centrifugal-compressors are outlined. The focus is on a continuously in-creasing H2fraction in existing natural gas pipeline networks.Thereby, this paper raises consciousness for a new research area.Based on basic thermodynamic analysis, mean-line and compu-tational fluid dynamics (CFD), the challenges and required mea-sures to reach pressure ratios in a single-stage similar to com-pressors for heavier gas molecules are highlighted. Furthermore,all results are compared to CH4. Increasing the rotational speedor, at least partially, using counter rotating rotors emerges aspossible solutions. Thereby, an economically implementation ispossible and brings H2one step closer to a storage option for en-ergy converted from renewable sources. As a case study, a single-stage centrifugal-compressor for re-compression in pipelines isdesigned and analysed with 3D CFD. The operation of the com-pressor in conjunction with the pipeline is investigated. In con-clusion, a pipeline equipped with centrifugal-compressors usingvariable speed control can deliver constant heating power forpure CH4and pure H2. To achieve the required circumferentialspeeds, advanced materials are necessary and future researchand development activities have to focus on the application ofsuch materials to centrifugal-compressors.