MAGNITUDE OF CHANGE IN VOLUME OF HIGHLY PRESSURIZED GAS CYLINDER DURING VENTING

Sang Hyub Oh, Byung Moon Kim, Namgoo Kang

Abstract

Buoyancy effects due to cylinder expansion are taken into account as an important source of uncertainty in weighing for the preparation of primary or standard gas mixtures by gravimetric methods. Although linear cylinder expansion upon pressurization is known, reliable information on changes in the volumes of gas cylinders is very scarce. We present newly useful information on the magnitudes of changes in the volume depending upon different cylinder materials and volumetric capacities during gas filling and venting. We also found that he literature estimate of about 20 mL for the magnitude of volume expansion for 5-L cylinder capacity at 15 MPa appears significantly overestimated. Our estimate based on the experimental results in this study is within the upper limit of about 14 mL. It is therefore recommended for gas metrology and research communities to use this updated information.

Keywords

buoyancy effect, pressurization, expansion, gas mixture

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IMEKO-WC-2012-TC24-P2.pdf

DOI

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IMEKO TC

TC24 - Chemical Measurements

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