Hydrocarbon liquid flow calibration service

Yeh, Tsyh Tyan; Aguilera, Jess; Wright, John D.

doi:10.6028/nist.sp.250-1039

Cited by 4 publications

(10 citation statements)

References 6 publications

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“…The model of the screw is the BNK series of the THK company, the cumulative lead error of the screw is ± 0.008mm/300mm, according to the rectangular distribution, k= 3 , according to formula(8), the Class B relatively standard uncertainty of measurement is calculated. (9) u c (P) which introduced by the pressure P in the chambers mainly composed by the following parts: the error value u c1 (P 1 ) introduced by the Gage pressure sensor, the error value u c2 (P 2 ) introduced by the absolute pressure sensor, and the error value u c3 (P 3 ) introduced by the Cylinder pressure fluctuations.…”

Section: Uncertainty Analysismentioning

confidence: 99%

“…Some tiny gas flow standard devices have been established in many famous measurement organizations at home and abroad, such as the country's supreme tiny gas flow calibration device in NIST of the USA, which the flow range of the calibrator is from 0.03L/min to 30mL/min, the uncertainty of the calibrator is 0.2%(k=2) [9]; the piston calibrator in PTB of the Germany, which the flow range of the calibrator is from 5mL/h to 5L/h, the uncertainty of the calibrator is 0.05%(k=2) [2]; the Soap membrane type gas flow standard device in the research of metrology of China, which the flow range of the calibrator is from 25mL/min to 500mL/min, the uncertainty of the calibrator is 1.0%(k=2). In comparison, China's domestic starts later than the foreign in terms of small flow measurement, the study is also relatively small, the gap with foreign is very obvious [3,10].…”

Section: Introductionmentioning

confidence: 99%

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Design and Uncertainty Evaluation of the Tiny Gas Flow Calibrator

Chen¹,

Cheng²,

Wang³

et al. 2015

Proceedings of the First International Conference on Information Sciences, Machinery, Materials and Energy

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In recent years, the measurement and controlment of the tiny gas flow have been gained widely attention in some emerging areas, such as biological, medical, aerospace and so on. In order to study the characteristics of the tiny gas flow meter, the tiny gas flow calibrator based on the principle of the Symmetric plunger is designed, which the flow range of the calibrator is from 5mL/h to 1000mL/h. The structure and the working principle are introduced, the uncertainty's Sources and classification of the tiny gas flow calibrator are analyzed, the uncertainty components are analyzed and calculated, The expanded uncertainty of the device is less than 0.126%, which conforms to the design requirements of the device, and it have reached the advanced level at home and abroad. Finally, according to the experiment of the soap film flowmeter, The expanded uncertainty of calibration for the soap film flowmeter is less than 0.77%.

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Section: Uncertainty Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Uncertainty Evaluation of the Tiny Gas Flow Calibrator

Chen¹,

Cheng²,

Wang³

et al. 2015

Proceedings of the First International Conference on Information Sciences, Machinery, Materials and Energy

View full text Add to dashboard Cite

show abstract

“…As the piston strokes rightward the flow exits the cylinder on the right side and moves through the upper section of the four-way valve into the test section. The meter under test (MUT) is 1. Photograph and drawing of the essential components of the 20 L HLFS calibrated using the known flow delivered from piston-cylinder assembly as the reference.…”

Section: Description Of the 20 L Hlfsmentioning

confidence: 99%

“…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

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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.

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“…Compact piston prover systems (also referred as small volume provers) are used in the calibration of flowmeters. They have long been accepted as primary flow calibrators for both gas and liquid flowmeters [1][2][3]. Basically they compare the volume of fluid displaced by a piston during a specific time interval with the volumetric flow measured by a meter [3].…”

Section: Introductionmentioning

confidence: 99%

Implementation of Double-Timing Pulse Interpolation Applied to Compact Piston Provers

Jeronymo

Araujo

Aibe

2010

P&P

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This work presents an electronic circuit for double-timing pulse interpolation applied to compact piston provers (also referred as small volume provers). Compact provers are usually employed to prove meters with pulsed outputs. API and ISO standards [1,2] recommend a minimum of 10.000 pulses per run to obtain a resolution better than ± 0.01%. Since the volume of fluid displaced by a compact prover is relatively small, the number of pulses produced during a proving run is often considerably less than 10.000 pulses. Pulse interpolation techniques are commonly used to increase resolution and to diminish uncertainty during a proving run by estimating the fractional part of meter pulses within the time interval of the calibration. In this way, pulse interpolation techniques are essential to obtain accurate flow measurements and to allow the calibration of meters with compact provers. Our implementation uses a compact piston prover with an internal volume of 12 L and maximum flow capacity of 180 L/min. In order to implement the double-timing pulse interpolation method, we have used a Pentium D, 2.80 GHz installed with a 16-bit counter/timer board. Data acquisition and control software were written using VB .Net. An electronic circuitry was built to activate/deactivate counters gates, and to collect pulses. Some requirements and limitations of pulse interpolation techniques such as circuitry testing and pulse stability are also discussed in this work.

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Hydrocarbon liquid flow calibration service

Cited by 4 publications

References 6 publications

Design and Uncertainty Evaluation of the Tiny Gas Flow Calibrator

Design and Uncertainty Evaluation of the Tiny Gas Flow Calibrator

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

Implementation of Double-Timing Pulse Interpolation Applied to Compact Piston Provers

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