Standard for High Viscosity and Multiphase Liquid Flow Measurement

Jian, Wu; Luo, Rong

doi:10.1051/metrology/201302009

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Random error of weight filling system is associated with instable process in production, such as speed regulation, machine starting and closing [3][4][5]. The system error (combined error) of edible oil weighing filling includes load cell error, error by filling valve operating time delay, error by PLC response time delay, shock error by liquid flow, et al When the estimated value of system error is known, the system error can be corrected to get the modified measurements.…”

Section: Analysis Of Weighing Filling Errors For Edible Oilmentioning

confidence: 99%

Influence of Edible Oil Weight Filling Accuracy

2012

AMM

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The article discusses the characteristics of volumetric filling and weighing filling for edible oil. Influence of filling accuracy for edible oil has been studied in accordance with weight filling. It pointes out that error of weight filling system results from load cell error, error caused by filling valve operating time delay, error by PLC response time delay and shock error by liquid flow. After analyzing the causes of each error, it puts forward how to improve weight filling accuracy.

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Section: Analysis Of Weighing Filling Errors For Edible Oilmentioning

confidence: 99%

Influence of Edible Oil Weight Filling Accuracy

2012

AMM

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“…[15] Figure 4: The rate of mass decline in the liquid hydrogen tank during the measurement period [15] On the domestic side, preliminary research work on the metrological testing of LNG refuellers was carried out by the China Academy of Testing Technology and Shenyang Metrology and Testing Institute. Based on the cryogenic liquid mass method, the latter developed an LNG dispenser calibration device with high metrological accuracy, simple structure, and convenient operation with an extended uncertainty of 0.17% (k=2) [16]. The device is mainly composed of four parts: liquid filling line, gas return line, venting line and data acquisition system.…”

Section: Introductionmentioning

confidence: 99%

Research on standard device of liquid hydrogen flow driven by air pressure

Zhuo¹,

Tu²,

Li³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

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As an important link in the industry chain of hydrogen energy, liquid hydrogen has great potential in civil aviation, shipping, and urban public transportation, and is a also key component in the future large-scale industrialization of hydrogen energy. The accuracy of liquid hydrogen flow measurement is crucial in its preparation, storage, transportation, application, and trade settlement during the whole industry chain running. The liquid hydrogen flow standard device is the core equipment to check and calibrate the liquid hydrogen flowmeter, which is the key link to ensure the reliable flow measurement of liquid hydrogen. As a lowtemperature fluid with ultra-low viscosity and low density, the non-negligible error would be introduced when the flowmeter is calibrated using other fluids instead such as water, especially in the tiny flow range. Therefore, it is necessary to develop a flow standard device for actual-flow calibration of the liquid hydrogen flowmeters. In this paper, based on the existing research of cryogenic fluid standard devices at home and abroad, a liquid hydrogen flow standard device based on the bi-directional dynamic mass method is designed, using helium to drive the liquid hydrogen in the tank, which can provide the standard flow rate in the small flow range for the calibration and verification of the flowmeter under test. The system is designed to take into account the cryogenic temperature, low viscosity, high flammability and explosivity of the liquid hydrogen, as well as the measurement accuracy. Compared with the cryogenic pump, the high-pressure helium source can provide a more stable and smaller flow rate to achieve the higher accuracy and robustness of the calibration and verification of the flowmeters under the small flow rate of the device. The bi-directional dynamic mass method with reverse drive can avoid the influence of additional pipe capacity on the actual error generated during measurement, effectively reduce the measurement uncertainty of the device and improve the measurement system of the liquid hydrogen flow.

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Standard for High Viscosity and Multiphase Liquid Flow Measurement

Cited by 2 publications

References 4 publications

Influence of Edible Oil Weight Filling Accuracy

Influence of Edible Oil Weight Filling Accuracy

Research on standard device of liquid hydrogen flow driven by air pressure

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