An Uncertainty Analysis of a NIST Hydrocarbon Liquid Flow Calibration Facility

Yeh, Tsyh Tyan; Espina, Pedro I.; Mattingly, G. E.; Briggs, Nathaniel R.; Aguilera, Jesus J.

doi:10.1115/ht-fed2004-56790

Cited by 6 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A notable point in relation to this conception is that the responsibility regarding the metrological traceability of the refrigerating capacity is placed entirely on the mass flow rate measurement. Fortunately there has been much effort to define national standards for flow rates of substances other than water, specially hydrocarbons [16][17][18].…”

Section: Conception Of a Solution For A Capacity Standardmentioning

confidence: 99%

Conception of a test bench to generate known and controlled conditions of refrigerant mass flow

Martins

Flesch

et al. 2011

ISA Transactions

View full text Add to dashboard Cite

Section: Conception Of a Solution For A Capacity Standardmentioning

confidence: 99%

Conception of a test bench to generate known and controlled conditions of refrigerant mass flow

Martins

Flesch

et al. 2011

ISA Transactions

View full text Add to dashboard Cite

“…3, 2011;pp. 187-202 ORIGINAL ARTICLE been in use for several years and their operation and uncertainty analyses are documented in NIST internal records and in previous publications [1,2]. In this manuscript, we document the operating principle for the 20 L HLFS, its governing flow equations, calibration procedure, uncertainty analysis, and the results of comparisons with the three older NIST liquid hydrocarbon flow standards and also with NIST's Water Flow Calibration Facility [3].…”

Section: Introductionmentioning

confidence: 99%

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

Johnson

Crowley

Yeh

2011

MAPAN

Self Cite

View full text Add to dashboard Cite

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 m 3 / s (0.3 gpm) to 2.6 × 10 -3 m 3 /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.

show abstract

“…NIST uses the LFSs described herein to provide liquid flow meter calibrations for flows between 0.003 L/s and 2.5 L/s [4]. The most common flow meter types received for calibrations are turbines, Coriolis meters, and positive displacement (PD) meters.…”

mentioning

confidence: 99%

Liquid Flow Meter Calibrations with the 0.1 L/s and the 2.5 L/s Piston Provers

Pope¹,

Wright²,

Johnson³

et al. 2013

View full text Add to dashboard Cite

This document provides a description of the 2.5 L/s and 0.1 L/s liquid flow calibration standards operated by the National Institute of Standards and Technology (NIST) Fluid Metrology Group to provide flow meter calibrations for customers. The 0.1 L/s and 2.5 L/s flow standards measure flow by moving a piston of known cross-sectional area over a measured length during a measured time. The 0.1 L/s standard uses a passive piston prover technique where fluid is driven by a pump that in turn moves the piston. The 2.5 L/s standard uses a variable speed motor and drive screw to move the piston and thereby move the fluid through the system. The fluid medium used in these standards is a propylene glycol and water mixture that has kinematic viscosity of approximately 1.2 cSt at 21 °C (1 cSt = 1 x 10-6 m 2 /s), but the ratio of propylene glycol to water can be altered to offer a range of fluid properties. The 0.1 L/s standard has an expanded uncertainty of ± 0.044 %, spanning the flow range 0.003 L/s to 0.1 L/s (0.05 gal/min to 1.5 gal/min). The 2.5 L/s standard has an expanded uncertainty of ± 0.064 %, spanning the flow range 0.02 L/s to 2.0 L/s (0.3 gal/min to 31 gal/min) (Here, expanded uncertainties correspond to a 95 % confidence level). This document provides an overview of the liquid flow calibration service and the procedures for customers to submit their flow meters to NIST for calibration. We derive the equation for calculating flow at the meter under test, including the corrections for storage effects caused by changes in fluid density in the connecting volume (due to temperature changes). Finally, we analyze the uncertainty of the flow standards, give supporting data, and provide a sample calibra tion report.

show abstract

An Uncertainty Analysis of a NIST Hydrocarbon Liquid Flow Calibration Facility

Cited by 6 publications

References 1 publication

Conception of a test bench to generate known and controlled conditions of refrigerant mass flow

Conception of a test bench to generate known and controlled conditions of refrigerant mass flow

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

Liquid Flow Meter Calibrations with the 0.1 L/s and the 2.5 L/s Piston Provers

Contact Info

Product

Resources

About