An international standard for flow-rate measurement

1983 ◽  
Vol 26 (11) ◽  
pp. 908-911
Author(s):  
E. P. Pistun
Keyword(s):  
Flow Rate ◽  
Rate Measurement ◽  
Flow Rate Measurement ◽  
International Standard

Improved Discharge Measurement Using the Pressure-Time Method in a Hydropower Plant Curved Penstock

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
Adam Adamkowski ◽  
Zbigniew Krzemianowski ◽  
Waldemar Janicki
Keyword(s):  
Velocity Field ◽  
Flow Rate ◽  
Cross Sections ◽  
Hydropower Plant ◽  
National Standard ◽  
Problem Solution ◽  
Rate Measurement ◽  
Flow Rate Measurement ◽  
International Standard ◽  
Pressure Time

One of the basic flow rate measurement methods applied in hydropower plants and recommended by the International Standard IEC 60041–1999 and American National Standard ASME PTC 18–2002 is the pressure-time method, generally known as Gibson method. The method consists in determining the flow rate (discharge) by integration of the recorded time course of pressure difference variations between two cross sections of the hydropower plant penstock. The accuracy of measurement depends on numerous factors and, according to the International Standard, generally is confined within the range 1.5–2.3%. Following the classical approach, the pressure-time method applicability is limited to straight cylindrical pipelines with constant diameters. However, the International Standard does not exclude application of this method to more complex geometries, i.e., curved pipeline (with elbows). It is obvious that a curved pipeline causes deformation of the uniform velocity field in pipeline cross sections, which subsequently causes aggravation of the accuracy of the pressure-time method flow rate measurement results. The influence of a curved penstock application on flow rate measurements by means of the considered method is discussed in this paper. The special calculation procedure for the problem solution has been developed. The procedure is based on the FLUENT computational fluid dynamic solver. Computations have been carried out in order to find the so-called equivalent value of the geometric pipe factor F required when using the pressure-time method. An example of application of this method to a complex geometry (two elbows in a penstock) is presented. The systematic uncertainty caused by neglecting the effect of the elbows on velocity field deformation has been estimated.

Invariant method for measuring wet gas flow rate

2021 ◽  
pp. 13-19
Author(s):  
Zhanat А. Dayev ◽  
Gulzhan E. Shopanova ◽  
Bakytgul А. Toksanbaeva
Keyword(s):  
Flow Rate ◽  
Measurement System ◽  
Flow Measurement ◽  
Gas Flow ◽  
Test Results ◽  
Invariant System ◽  
Rate Measurement ◽  
Gas Flow Rate ◽  
Flow Rate Measurement ◽  
Wet Gas

The article deals with one of the important tasks of modern flow measurement, which is related to the measurement of the flow rate and the amount of wet gas. This task becomes especially important when it becomes necessary to obtain information about the separate amount of the dry part of the gas that is contained in the form of a mixture in the wet gas stream. The paper presents the principle of operation and structure of the invariant system for measuring the flow rate of wet gas, which is based on the combined use of differential pressure flowmeters and Coriolis flowmeters. The operation of the invariant wet gas flow rate measurement system is based on the simultaneous application of the multichannel principle and the partial flow measurement method. Coriolis flowmeters and the differential pressure flowmeter are used as the main elements of the system. The proposed measurement system does not offer applications for gases with abundant drip humidity. The article provides information about the test results of the proposed invariant system. The estimation of the metrological characteristics of the invariant system when measuring the flow rate of wet gas is given. The obtained test results of the invariant wet gas flow rate measurement system are relevant for natural gas production, transportation, and storage facilities.

Electrostatic Sensor for Real–Time Mass Flow Rate Measurement of Particle Conveying in Pneumatic Pipeline

2012 ◽  
Author(s):  
Mohd. Fua’ad Rahmat ◽  
Wee Lee Yaw
Keyword(s):  
Real Time ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Cross Correlation ◽  
High Accuracy ◽  
Industrial Processes ◽  
Rate Measurement ◽  
Flow Rate Measurement ◽  
Controlled Flow

This paper discussed the electrostatic sensors that have been constructed for real–time mass flow rate measurement of particle conveying in a Pneumatic pipeline. Many industrial processes require continuous, smooth, and consistent delivery of solids materials with a high accuracy of controlled flow rate. This requirement can only be achieved by installing a proper measurement system. Electrostatic sensor offers the most inexpensive and simplest means of measuring solids flows in pipes. Key words: Electrostatic sensor, cross-correlation, peripheral velocity

scholarly journals Feasibility of small bowel flow rate measurement with MRI

2010 ◽  
Vol 32 (2) ◽  
pp. 345-351 ◽  
Author(s):  
Andreas Gutzeit ◽  
Michael A. Patak ◽  
Constantin von Weymarn ◽  
Nicole Graf ◽  
Aleksis Doert ◽  
...  
Keyword(s):  
Small Bowel ◽  
Flow Rate ◽  
Rate Measurement ◽  
Flow Rate Measurement

scholarly journals Flow rate measurement in aggressive conductive fluids

2014 ◽  
Vol 67 ◽  
pp. 02022 ◽  
Author(s):  
Nataliia Dubovikova ◽  
Yuri Kolesnikov ◽  
Christian Karcher
Keyword(s):  
Flow Rate ◽  
Rate Measurement ◽  
Flow Rate Measurement
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