Fluid Structure Interaction (FSI) is the basis of the working principle of Coriolis Mass Flowmeter (CMF). Up to now the description of this coupling has been done using some crude simplifications. Within this weak coupling approximation, the action of the fluid on the structure, the so-called Coriolis force, is easily derived from the structure movement. Clearly the fluid properties effects are out of the reach of this simple model. Nevertheless, CMF are very competetive and are used in many fluid (liquid and gas) flow metering applications. Therefore an "a priori" understanding of their behaviour is needed.
This study presents the results achieved with ADINA, a multipurpose FE code with a special strength in FSI. The vibration characteristics of a clamped-clamped straight pipe conveying various fluids are calculated. The model consists of a pipe described as a shell and a real fluid. It is a computation starting from "first principles". The results compare quite well with the experimental and the theoretical values. In a Finite Element (FE) procedure the geometry and/or the material properties and/or the loads are readily changed. Therefore a tool is available for simulating and comparing different CMF designs.

The introduction and operation of a hydrological data net depends on the installation of flow stations net that can generate reliable data obtained from a stage discharge curve, that is produced through a series of flow measurements made in the cross section. Usually, for measurement of those flows, it is used the conventional current meters and other methods. They are well-known and applied plenty methods, however, in the execution they demand time, knowledge and technical abilities, without which can be generated data that are not real.
A way to accelerate the process is the use of methods and automated devices, as it is the case of Acoustic Doppler Current Profiler - ADCP, that measures the flow automatically through Doppler effect. However, its use is restricted to the great rivers.
The present paper makes a review and has the objective of comparing different methods of flow measurement. In this case, the comparison is made between the conventional methods and the acoustic automated method of ADCP. With this study, it intends to verify the reliability of the instrument for flow measurement in small and medium rivers and, according to the case, to develop a methodology for the imposed conditions.

By combining integrated electronics with integral orifice technology, these flowmeters are capable of measuring three process variables in one device: DP, static pressure, temperature, and then dynamically compensating mass flow rate. With built in flow computers for dynamic compensation, integrated flowmeters eliminate the errors commonly found in non-dynamic compensated flow measurement. This design eliminates tubing, valves, adapter unions, transmitter mounting, excessive welding and leak points, therefore reducing installation time.
Traditional meters measure a single process variable, where multivariable transmitters simultaneously measures all process variables necessary for calculating either pressure and temperature compensated gas flow or temperature compensated liquid flow. When calibrated in a factory laboratory, the mass flow rate accuracy over an 8 to 1 flow turndown is 0.75% of reading for liquids and 0.85% of reading for gas or steam.
Integral orifice flowmeters enhanced functionality gives the end user a greater degree of control over plant operations, as well as competitive advantages and economic benefits. With one device instead of three, installation is easier and maintenance costs are lower. In addition, because you have reduced the penetrations in your process line, you are better able to meet stringent environmental regulations. These enhanced DP flow products have revolutionized the industry and started a new era in DP based measurement.

The objective of this study is to improve the metering facilities at metering stations of Korea Gas Corporation (KOGAS), which are being operated in unsatisfying meter run conditions. For experiments, a test facility was constructed to simulate one of the metering stations and it was set up in Jung-dong metering station. Presently, KOGAS has 60 nationwide metering stations and among them, 34 metering stations are located in metropolitan area.
Tests were performed with both diameter ratio (<i>β = <i>d / <i>D) and flow rate variations and the test range of diameter ratio of orifice flow meter was from 0.3 to 0.7. The results showed that the error was - 7.2 % (maximum flow rate=3,661 Nm³/h) and - 3.1% (maximum flow rate=11,716 Nm³/h) for <i>β = 0.3 and 0.7, respectively without straightener. Thus, the diameter ratio was inversely proportional to the error, but on the contrary, the flow rate was proportional to the error. For the case of straghtener installation, the error showed 0.4 % (maximum flow rate = 3,030 Nm³/h) and 0.8% (maximum flow rate = 9,204 Nm³/h) for <i>β = 0.3 and 0.7, respectively. The error was not sensitive to the diameter ratio, but it was decreased when the flow rate was increased.