A portable calibration densimeter for use in cryogenic liquids

Siegwarth, J. D.; LaBrecque, J.F.

doi:10.6028/nbs.tn.1035

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…In some later tests, a third silicon densimeter, the Portable Reference Densimeter (PRD) was compared to the DRS densimeter in the DRS [5]. The PRD and DRS densimeters are similar in design, but the silicon single crystal was obtained from a different source.…”

Section: Addition Of a New Balancementioning

confidence: 99%

Cryogenic fluids density reference system :

Siegwarth¹

1981

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The improved Density Reference System, the reference densimeter, and the method of determining sample density are described. The uncertainty of the density reference system is ± 0.055%. The contribution from the estimated systematic error in density was ± 0.022%. The estimated uncertainty caused by random error is three times the standard deviation of 0.011% and is based on sixty-three measurements of the densities of saturated liquid methane. The total density uncertainty is taken to be the sum of the systematic 3 and random errors. This applies to the density range of 400 to 480 kg/m at pressures from 0.8 to 4 bar absolute and temperatures between 109 and 128 K. This 3 accuracy statement is expected to apply over ranges of at least 400 to 1000 kg/m in density, 77 to 300 K in temperature, and 0.8 to 7 bar in pressure though the accuracy over these ranges has not been verified. * Compared to the original, this improved density reference system has greater accuracy, speed, reliability, and flexibility.

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Section: Addition Of a New Balancementioning

confidence: 99%

Cryogenic fluids density reference system :

Siegwarth¹

1981

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Estimated Uncertainty of Calculated Liquefied Natural Gas Density from a Comparison of NBS and Gaz de France Densimeter Test Facilities

Roncier¹,

Philippe²,

Saint-Just³

et al. 1983

J. RES. NATL. BUR. STAN.

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Liquefied natural gas (LNG) densities can be measured directly but are usually determined indirectly in custody transfer measurement by usming a density correlation based on temperature and composition measurements. An LNG densimeter test facility at the National Bureau of Standards uses an absolute densimeter based on the Archimedes principle, while a test facility at Gaz de France uses a correlation method based on measurement of composition and density. A comparison between these two test facilities using a portable version of the absolute densimeter provides an experimental estimate of the uncertainty of the indirect method of density measurement for the first time, on a large (32 L) sample. The two test facilities agree for pure methane to within about 0.02%. For the LNG-like mixtures consisting of methane, ethane, propane, and nitrogen with the methane concentrations always higher than 86%, the calculated density is within 0.25% of the directly measured density 95% of the time.

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A portable calibration densimeter for use in cryogenic liquids

Cited by 2 publications

References 3 publications

Cryogenic fluids density reference system :

Cryogenic fluids density reference system :

Estimated Uncertainty of Calculated Liquefied Natural Gas Density from a Comparison of NBS and Gaz de France Densimeter Test Facilities

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