FLOW METER CALIBRATION WITH SONIC NOZZLES IN HIGH- PRESSURE NATURAL GAS

H. Dietrich, B. Nath, E. v. Lavante, M. Jaeschke, P. Schley , H.-J. Hotze

Abstract

A new CEN-Standard for gas flow meters requires meters, which working at operating pressures of more than 4 bar to be calibrated accordingly. However in this pressure range, and especially for small flow rates, only a few suitable test rigs exist world-wide. Based on the good experience with sonic nozzles for air at atmospheric conditions, their use for the calibration of gas flow meters in high pressure natural gas is anticipated.<BR />The present paper presents a novel concept for the design and usage of sonic nozzles in high pressure natural gas test rigs. It is based on theory, simulation and measurement results. This concept includes accurate procedures to take into account the gas composition as well as boundary layer and thermal effects of the nozzle flow.

Keywords

sonic nozzles, test rig, high pressure, natural gas, CFD simulation

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IMEKO-TC9-2000-059.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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