Cryogenic Fluids Density Reference System: Provisional Accuracy Statement (1980) Page: 41
This report is part of the collection entitled: Technical Report Archive and Image Library and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Table 9.1. Statistical Summary for Percentage Differences for Methane Data (%)
95% Confidence
Estimate Upper 95% Estimate Upper 95% interval for
6% of aE confidence limit of aF confidence limit mean
PIR-PDRSx100 .010 .012 .0085 .034 -.0037 .017
PDRS
PHH xlDRSx100 .0051 .0063 .0063 .022 .087 .012
PDRS
PHH~PIRx100 .010 .013 .0071 .032 .083 .015
PIRThe estimated values of oE and 0F for 6% equation (9.1) in the case of the
LNG-like mixture are, respectively, 0.005% and 0.004%. The first of these
numbers is based on 60 observations and the second on the means of the four
fillings. A 95% upper limit for aE is 0.006% and a 95% upper limit for
QF is 0.014%. The 95% confidence interval for the mean of the 6% for the four
fillings of LNG is -0.006% .009%. Based on the data for either methane or
LNG, there is no significant offset between the two densimeters.
The measured value of the reference weight, corrected for buoyancy, was
occasionally more than a milligram different during these tests from its
assigned mass value of 102.9022 g. The average value for the methane runs is
0.8 mg higher and that for the LNG runs is 0.5 mg lower than this value. Some
of the deviation is probably due to non-equilibrium in the sample vapor space so
the correction for buoyancy has detectable errors, and there seems to be some41
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Siegwarth, J. D. & LaBrecque, J. F. Cryogenic Fluids Density Reference System: Provisional Accuracy Statement (1980), report, April 1981; Washington D.C. (https://digital.library.unt.edu/ark:/67531/metadc502552/m1/50/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.