'NMi TraSys', THE ULTIMATE CARRIER & MULTIPLIER FOR THE UNIT OF VOLUME FOR HIGH-PRESSURE NATURAL GAS

M. P. van der Beek, I. J. Landheer

Abstract

<p>The paper describes the newly developed 'NMi TraSys' - NMi Traceability System. This travelling carrier &amp; multiplier of traceability has been realized to embody a significant part of the Dutch National traceability-chain for high-pressure gas-flow measurements. The number of contributions of uncertainty as well as their values, due to 'copy-losses' and 'installation-effects'during the traditional transfer of traceability from one facility to another, are decreased. <br />First results are presented about observed repeatability and reproducibility, uncertainties and consistency checks. The device will include in time, reference values of three different independently realized primary standards (viz. DDD - Dynamic Displacement Device, GOPP – Gas-Oil Piston-Prover and NMi TraSys itself). With internal harmonization processes at NMi VSL with "input" reference values from the three other primary standards, viz. DDD-conventional, DDD-extended pressure level and GOPP, the aim of 0,1% uncertainty at 4.000 m³ / h and <i>p</i> = 60 bar is within reach. This will improve the uncertainty as well as the stability of the Dutch National reference values considerably. <br />NMi TraSys will be used as a set of Travelling Reference Meters, creating an efficient availability of stable and validated Harmonized Reference Values for high-pressure gas-flow.</p>

Keywords

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IMEKO-TC9-2003-016.pdf

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IMEKO TC

TC9 - Flow Measurement

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