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Author: John Wright

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1. Performance of Coriolis Meters in Transient Gas Flows
Published: 3/17/2014
Authors: Jodie G Pope, John D Wright
Abstract: NIST evaluated the instantaneous and totalized flow measured by two commercial coriolis meters under transient flow, pressure, and temperature conditions using a Transient Flow Facility (TFF) developed for this purpose. During a simulated cascade fi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914068

2. Liquid Flow Meter Calibrations with the 0.1 L/s and 2.5 L/s Piston Provers
Series: Special Publication (NIST SP)
Report Number: 250-1039r1
Published: 1/15/2014
Authors: Jodie G Pope, John D Wright, Aaron N Johnson, Christopher J. Crowley
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914768

3. Improved Nozzle Manifold for Gas Flow Calibrations
Published: 6/20/2012
Authors: Aaron N Johnson, Chunhui Li, John D Wright, Gina M Kline, Christopher J. Crowley
Abstract: We developed a new nozzle manifold that reduced the uncertainty of flow calibrations from 0.09 % to as low as 0.074 % for flows of air up to 0.84 kg/s (43 000 L/min at reference conditions of 101.325 kPa and 293.15 K). The nozzle manifold also reduc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911475

4. Tests of the Extended Lee Model Using Three Different Turbine Meters
Published: 6/20/2012
Authors: Jodie G Pope, John D Wright, Sherry D Sheckels
Abstract: We report additional tests of our ,extended Lee modelŠ for calibrating turbine meters. The model accounts for 1) Reynolds number (Re) dependent drag and lift, 2) bearing static drag and 3) bearing viscous drag. Initially, we tested this model using ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911318

5. Calibration of Laminar Flow Meters for Process Gases
Published: 6/1/2012
Authors: John D Wright, Thiago Cobu, Robert F Berg, Michael R Moldover
Abstract: We calibrated three models of commercially-manufactured, laminar flow meters (LFMs) at four pressures (100 kPa, 200 kPa, 300 kPa, and 400 kPa) with five gases (N2, Ar, He, CO2, and SF6) over a 10:1 flow range using NIST‰s primary flow standards as re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908560

6. Extended Lee model for the turbine meter & calibrations with surrogate fluids
Published: 5/1/2012
Authors: Jodie G Pope, John D Wright, Aaron N Johnson, Michael R Moldover
Abstract: We developed a physical model termed the ,extended Lee modelŠ for calibrating turbine meters to account for 1) fluid drag on the rotor, 2) bearing static drag and 3) bearing viscous drag. We tested the extended Lee model using a dual rotor, 2.5 cm d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909672

7. A Comparison of 12 US Liquid Hydrocarbon Flow Standards and the Transition to Safer Calibration Liquids
Published: 4/1/2012
Authors: John D Wright, Aaron N Johnson, Gina M Kline, Christopher J. Crowley, Jodie G Pope, Vern E. Bean
Abstract: During 2010 and 2011, NIST piloted a 12-laboratory comparison of hydrocarbon liquid flow calibration standards spanning the range 3.8 L/min to 38 L/min. The laboratories were in mutual agreement within the expected 0.3 % uncertainty, which is approx ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910867

8. Accurate Measurements of Process Gas Flow with Laminar Flow Meters
Published: 10/15/2010
Authors: Thiago Cobu, Robert F Berg, John D Wright, Michael R Moldover
Abstract: We calibrated three models of commercially-manufactured, laminar flow meters (LFMs) with nitrogen at four pressures (100 kPa, 200 kPa, 300 kPa, and 400 kPa) over a 10:1 flow range using NIST‰s primary flow standards and a physical model. Without addi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906313

9. Properties for Accurate Gas Flow Measurements
Published: 10/15/2010
Author: John D Wright
Abstract: Accurate gas properties are needed to take full advantage of the low uncertainties provided by NIST‰s Gas Flow Calibration Services. If a flowmeter user and NIST use different values for these properties (molecular mass, compressibility, density, vis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905976

10. NIST Calibration Services for Hydrometers.
Series: Special Publication (NIST SP)
Report Number: SP250-78
Published: 4/19/2010
Authors: John D Wright, Vern E. Bean
Abstract: The National Institute of Standards and Technology (NIST) provides calibration services for hydrometers used to measure liquid density. Hydrometers with scales for density, specific gravity, proof spirit for alcohol solutions, API degrees for petrole ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832342



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