Precise determination of the jacket pressure coefficient of controlled-clearance pressure balances

Hiroaki KAJIKAWA, Tokihiko KOBATA, Kazunori IDE, Akira OOIWA

Abstract

We are now developing a new controlled-clearance pressure balance to upgrade the hydraulic high-pressure standard up to 1 GPa. Characterization experiments for a 500 MPa controlled-clearance piston-cylinder were performed in detail over wide pressure range, and the effective area was estimated based on the Heydemann-Welch model. The estimation based on the conventional model agrees well with the present pressure standard. However, at high pressures around 500MPa, there appears some contradictions to the assumption of the model; especially, the jacket pressure coefficient depends apparently on the jacket pressure. A possible revision on the model is briefly discussed.

Keywords

controlled-clearance piston-cylinder, Heydemann-Welch model

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IMEKO-TC16-2007-073u.pdf

DOI

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IMEKO TC

TC16 - Pressure and Vacuum Measurement

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