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Search Publications by: John D. Wright (Assoc)

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Displaying 76 - 100 of 134

Gas Flowmeter Calibrations With the 26 m 3 PVTt Standard

November 25, 2009
Author(s)
Aaron N. Johnson, John D. Wright
This document describes NIST s 26 m3 pressure, volume, temperature, and time (PVTt) primary flow standard. This standard is used to calibrate gas flow meters over a range extending from 200 standard L/min to 77,000 standard L/min where the reference

Hydrocarbon Liquid Flow Calibration Service

November 25, 2009
Author(s)
Tsyh Tyan Yeh, Jesus J. Aguilera, John D. Wright
This document provides a description of the NIST s new hydrocarbon liquid flow calibration system (HLFS) operated by the National Institute of Standards and Technology (NIST) Fluid Flow Group. The calibrator is used to provide hydrocarbon liquid flowmeter

NIST Calibration Services for Liquid Volume

November 24, 2009
Author(s)
Vern E. Bean, Pedro I. Espina, John D. Wright, J F. Houser, Sherry D. Sheckels, Aaron N. Johnson
NIST provides calibration services for metal volume provers for liquid volumes from 4 L to 7600 L using gravimetric and volumetric methods. This document describes the procedures and methods of calculation used in the calibration service. The covered

Gas Flowmeter Calibrations With the Working Gas Flow Standard

November 23, 2009
Author(s)
John D. Wright, Jean-Phillipe Kayl, Aaron N. Johnson, Gina M. Kline
The Working Gas Flow Standard (WGFS) uses critical venturis, critical nozzles, or laminar flowmeters as working standards to calibrate customer flowmeters. The working standards are periodically calibrated with primary standards: the 34 L, 677 L, or 26 m3

High Definition Flow

August 1, 2009
Author(s)
John D. Wright, Michael R. Moldover
From pharmaceutical production to the natural gas market, exact flow measurements are critical. Here's how NIST helps keep us all on the same page.

Comparisons by PTB, NIST, and LNE-LADG in Air and Natural Gas With Critical Venturi Nozzles Agree Within 0.05 %

May 16, 2006
Author(s)
B Mickan, Roland H. Kraemer, D Dopheide, Hans-Jurgen Hotze, Heino-Michael Hinze, Aaron Johnson, John D. Wright, J-P Vallet
The PTB, NIST, and LNE-LADG conducted a comparison of gas flow measurement standards in air and natural gas in the pressure range from 0.9 to 42 bar. The artifacts used in the intercomparisons were four critical venturis with ISO standard toroidal shape

Diverter Uncertainty Less Than 0.01 percent for Water Flow Calibrations

May 16, 2006
Author(s)
Iryna V. Marfenko, Tsyh Tyan Yeh, John D. Wright
Measurement uncertainties introduced by liquid flow diverters are often one of the major contributors to the total uncertainty of static gravimetric liquid flow calibration facilities. This paper describes the primary water flow standard at NIST and tests

Inside Diameter Measurements for the Cylinder of a 20 L Piston Prover

March 23, 2006
Author(s)
Jesus J. Aguilera, Tsyh Tyan Yeh, John D. Wright
We made inside diameter measurements of a stainless steel cylinder used in a piston prover for hydrocarbon liquid flow measurements. We used a 3-point micrometer and two traceable setting rings to measure diameter at 12 radial positions at each of 21

Relaxation Effects in Small Critical Nozzles

January 1, 2006
Author(s)
Aaron N. Johnson, C L. Merkle, Michael R. Moldover, John D. Wright
We computed the flow of four gases (He, N 2, CO 2, and SF 6) through a critical nozzle by augmenting traditional computational fluid dynamics (CFD) with a rate equation that accounts for τ relax, a species-dependent relaxation time that characterizes the