Uncertainty Analysis of NIST’s 20 Liter Hydrocarbon Liquid Flow Standard |
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| Aaron N. Johnson, Chris J. Crowley, TT Yeh |
- Abstract:
- The National Institute of Standards and Technology (NIST) uses a bi-directional 20 L-displacement piston prover as its primary standard for measuring hydrocarbon liquid flows ranging from 1.86 × 10-5 m3/s (0.3 gpm) to 2.6 × 10-3 m3/s (40 gpm). Our analysis that shows that the prover’s uncertainty over this flow range is 0.074 % (k = 2, corresponding to a 95 % confidence interval). Using a dual rotor turbine meter as the transfer standard, we compare the new 20 L piston prover standard with NIST’s other hydrocarbon liquid standards and NIST’s water flow standard. The results are consistent with the presented uncertainty analysis.
- Keywords:
- NIST liquid hydrocarbon flow standard, piston prover, water draw procedure, liquid flow calibration, uncertainty analysis
- Download:
- IMEKO-TC9-2010-047.pdf
- DOI:
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