Recent progress in high pressure metrology in Europe

Wladimir Sabuga,Dominik Pražák,Thierry Rabault,J.-R Filtz,B Larquier,J.-O Favreau,P Claudel

doi:10.1051/epjconf/20147700006

Abstract

Five European national metrology institutes in collaboration with a university, a research institute and five industrial companies are working on a joint research project within a framework of the European Metrology Research Programme aimed at development of 1.6 GPa primary and 1.5 GPa transfer pressure standards. Two primary pressure standards were realised as pressure-measuring multipliers, each consisting of a low pressure and a high pressure (HP) piston-cylinder assembly (PCA). A special design of the HP PCAs was developed in which a tungsten carbide cylinder is supported by two thermally shrunk steel sleeves and, additionally, by jacket pressure applied to the outside of the outer sleeve. Stress-strain finite element analysis (FEA) was performed to predict behaviour of the multipliers and a pressure generation system. With FEA, the pressure distortion coefficient was determined, taking into account irregularities of the piston-cylinder gap. Transfer pressure standards up to 1.5 GPa are developed on the basis of modern 1.5 GPa pressure transducers. This project shall solve a discrepancy between the growing needs of the industry demanding precise traceable calibrations of the high pressure transducers and the absence of adequate primary standards for pressures higher than 1 GPa in the European Union today.

Highlights

New high pressure technologies such as autofrettage, hydroforming and isostatic pressing are being widely developed and used in the car industry, diesel engineering, vessel production for the petrochemical and pharmaceutical industries, manufacturing water cutting machines, new material fabrication and, recently, for food sterilisation
In the tapered part of the tube, in the sections where the tube is not supported by the cylinder, the region of plastic deformation does not exceed 1/3 of the tube cross section. These results indicate a reliable connection between the high pressure (HP) piston-cylinder assembly (PCA) and tube at pressures up to 1.6 GPa
Very first tests of the multipliers were performed by Fluke at pressures (100 to 500) MPa on the HP side and (5 to 25) MPa on the low pressure (LP) side of the multipliers using two piston gauges as a reference, with DHS as a pressure transmitting liquid and at pj = 0.25·pH [5]

Summary

Introduction

New high pressure technologies such as autofrettage, hydroforming and isostatic pressing are being widely developed and used in the car industry, diesel engineering, vessel production for the petrochemical and pharmaceutical industries, manufacturing water cutting machines, new material fabrication and, recently, for food sterilisation. With these new technologies, the quality and lifetime of products and the efficiency of processes can be increased, material and energy resources saved, and the emission of pollutants reduced. This approach provides only a vague estimation of pressure outside of the transducers'

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