, 26:187 | Cite as

Uncertainty analysis of NIST’s 20 liter hydrocarbon liquid flow standard

  • Aaron N. JohnsonEmail author
  • Chris J. Crowley
  • T. T. Yeh
Original Article


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 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.


Uncertainty Analysis Versus Versus Versus Versus Uncertainty Budget Reverse Osmosis Water Flow Standard 
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Copyright information

© Metrology Society of India 2011

Authors and Affiliations

  • Aaron N. Johnson
    • 1
    Email author
  • Chris J. Crowley
    • 1
  • T. T. Yeh
    • 1
  1. 1.Fluid Metrology GroupNational Institute of Standards and Technology (NIST)GaithersburgUSA

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