Heyde, Michael von derMichael von derHeydeSchmitz, GerhardGerhardSchmitzMickan, BodoBodoMickan2020-02-182020-02-182015-09Linköping Electronic Conference Proceedings (118): 663-670 (2015)http://hdl.handle.net/11420/4950The German national metrological institute Physikalisch-Technische Bundesanstalt uses a High Pressure Piston Prover as the primary standard for high pressure natural gas flow meters. The High Pressure Piston Prover measures the gas flow rate using the time a piston needs to displace a defined enclosed volume of gas in a cylinder. Fluctuating piston velocity during measurement can be a significant source of uncertainty if not considered in an appropriate way (Mickan et al., 2010). A computational model written in Modelica was developed to investigate measures for the reduction of this uncertainty. Validation of the model shows good compliance of the piston velocity in the model with measured data for certain volume flow rates. Reduction of the piston weight, variation of the start valve switching time and integration of a flow straightener were found to reduce the piston velocity fluctuations in the model significantly.enhttp://rightsstatements.org/vocab/InC/1.0/modeling of multi-domain physical systemsmodelicahigh pressure piston proverhigh pressure natural gas flow meteringIngenieurwissenschaftenConference Paper10.15480/882.266910.3384/ecp1511866310.15480/882.2669Conference Paper