An evaluation of commercial densimeters for use in LNG

Siegwarth, J. D.; Younglove, B. A.; LaBrecque, J.F.

doi:10.6028/nbs.tn.697

Cited by 3 publications

(9 citation statements)

References 1 publication

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“…Some additional impurities may have been added by the time the sample has been placed in the DRS. Both the shifts between fillings and the random scatter within fillings are smaller for these densimeters than the similar densimeter tested and reported earlier [3].…”

Section: The Commercial Densimetersmentioning

confidence: 68%

“…The present DRS densimeter has an apparent uncertainty for one reading of +0.055% at 425 kg/m^density [3]. This is composed of a systematic uncertainty of 0.022% and 3 times the estimated standard deviation of 0.011%.…”

mentioning

confidence: 99%

“…Three of the densimeter types tested and reported earlier [2,3] If the mass and volume of the object are known, the density of the fluid is determined by the relation…”

Section: The Commercial Densimetersmentioning

confidence: 99%

“…Though all proved capable of density measurement in cryogenic liquids, all suffered from the same problem; they did not have a suitable calibration for LNG service. Though the calibration of the displacement densimeter tested was within specifications [2,3], subsequent tests showed the calibration method applied to this densimeter inadequate.…”

mentioning

confidence: 99%

“…A schematic of the rebuilt DRS is shown in figure 1 illustrating the relative positions of the densimeters within the liquid sample. A more detailed description of the DRS is contained in [3].…”

mentioning

confidence: 99%

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Tests of commercial densimeters for LNG service

Siegwarth¹

1982

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Section: The Commercial Densimetersmentioning

confidence: 68%

mentioning

confidence: 99%

“…Three of the densimeter types tested and reported earlier [2,3] If the mass and volume of the object are known, the density of the fluid is determined by the relation…”

Section: The Commercial Densimetersmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Tests of commercial densimeters for LNG service

Siegwarth¹

1982

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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

Siegwarth¹,

LaBrecque²

1981

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An evaluation of commercial densimeters for use in LNG

Cited by 3 publications

References 1 publication

Tests of commercial densimeters for LNG service

Tests of commercial densimeters for LNG service

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

A portable calibration densimeter for use in cryogenic liquids

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