J. Mata, L. Martins, A. Tavares de Castro, A. S. Ribeiro
Seepage through the foundation is a relevant condition for the structural assessment of concrete dams. The knowledge of the water flow measured in the drainage system installed to reduce the uplift pressure in a dam's foundation is, therefore, a main issue in the safety control of concrete dams. Monitoring systems include measuring devices to determine the water collected from drains and weirs in order to evaluate the amount of water that flows through the dam. In most large concrete dams, both manual and automated water flow measurements are possible. This paper proposes a statistical...
E Sanford, K Igarashi, R Steven
Combining different metering physical principles into one metering system offers various advantages. In this paper the advantages of producing a hybrid vortex and cone DP meter system is discussed. In single phase flow applications this hybrid meter produces a mass flow, volume flow, and fluid density predictions. In saturated steam and wet natural gas flow applications this hybrid meter can predict the two-phase flow quality, and total mass flow rate. The cone meter sub-system can also run the generic DP meter pressure field analysis diagnostic system ‘Prognosis‘.
R Steven, K Lewis
With most modern flow meters there is a drive to equip the meter with a comprehensive verification system driven by a diagnostic suite. A diagnostic suite is a collection of different individual diagnostic checks grouped together to collectively offer more information. The state of the art is to use these diagnostic suites to show if the meter has a problem, and if so then use diagnostic suite pattern recognition to try to identify the source of the problem. However, there is virtually no R&D published that goes on to then try and predict the associated flow prediction bias induced by that...
E. Batista, M. Condeço, A. Almeida, J. Alves e Sousa, I.l Godinho
Like any type of measuring instruments used for commercial transactions, fuel dispensers, commonly known as petrol pumps, are submitted to metrological control in order to assure consumer protection and provide society in general and citizens in particular the guarantee of accurate measurements, the verification being directly linked with the volume measurement of the delivered fuel. In Portugal, the fuel dispenser approved under the MID is subject to metrological control in service taking into account its annual verification by the verification bodies, following the procedures defined by...
XING Jing-fang, LIU Chen-kui, CHEN Shi-yan, NIU Li-na, ZHANG Dapeng
This paper is based on the 0.1 class 2000L standard bell prover of gas flow which is the provincial highest measurement standard established by our institute. The research subject of this device is from the provincial science and technology special project of hebei province. In this paper, the concept of volume coefficient is proposed for bell provers with different accuracy levels.The common mathematical model is analyzed and a new Fourier fitting mathematical model is proposed. The mathematical model of the inner volume of the bell prover is given by the definite integral principle. The...
José Dias, Luís Matias, Maria Henriques
Elements of building envelope, during service life, are subjected to deformations and volume changes due to moisture variations, which can cause anomalies in the building, such as the cracking of facade walls and consequent rain penetration, with increase of their moisture content. In case of heritage buildings with structural concrete elements and infill masonry walls, when, besides moisture variations, other different causes can be hypothetically possible, it can be justifiable to investigate more profoundly the anomalies with the available NDT techniques. This study is related to the...
H. Guta, S. Fischer, D. Dufour, M. Burckbuchler, G. Fromant
In the present paper, a data set of time-resolved two components velocity profile measurements under steady uniform turbulent rough clear water and sheet-flow are presented. The purpose of this campaign was to evaluate the performances of a commercial ADVP, the UB-Lab 2C from the company Ubertone, by comparing it to a well-established instrument, the ACVP, developed by the LEGI. This measurement method provides quasi-instantaneous co-located two (2C) components velocity profiles, overcoming limitations of previously developed acoustic measurement methods, and allowing to resolve fine flow...
K.-H. Cheong, R. Doihara, N. Furuichi, T. Shimada, Y. Terao
Motivated by the need to establish a measurement traceability in engine fuel consumption for the industry (automobile, shipping and aviation) as well as in the household fuel metering and bio-fuel production (bio-fuel blending), NMIJ developed a primary standard for low liquid hydrocarbon flow rates that works on three common types of liquid fuels, namely light oil (diesel), kerosene and industrial gasoline (flash point over 40 °C). To achieve a high calibration accuracy below 0.1 % which is needed by the industry, this primary standard adopted the gravimetric method performing static...
R. Doihara, K. H. Cheong, T. Shimada, N. Furuichi
A prototype small weighing system for liquid micro-flow from 10 mL/min down to 1 μL/min has been constructed. The calibration method was the static weighing with standing start and stop. The weighing system was set in a constant temperature and humidity chamber. At small flow rates, evaporation effect comes to be a significant error source. In order to reduce evaporation error, a detachable system between a weighing tank and a pipe line has been developed. The detachable device prevents pipeline tension to the weighing scale and is able to keep the pipeline closed while collection....
Jingqiong Zhang, Tao Wang, Jinyu Liu, Yong Yan, Edward Jukes
Condition monitoring of an abrasive or erosive process is essential to give early warning of potential issues and ensure safe delivery of fluid material via pipeline transportation. As one of the solutions to direct mass flow measurement, Coriolis flowmeters provide highly accurate and repeatable measurements in single phase flow processes. In some multiphase flow processes containing solid particles, Coriolis flowmeters may not perform well or even fail due to erosive wear of the measuring tubes. This paper presents an in-situ technique to monitor the structural conditions of a Coriolis...