AS 2360.6.1-1993

Measurement of fluid flow in closed conduits Volumetric methods - By mass

Standards Australia

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1 - AS 2360.6.1-1993 MEASUREMENT OF FLUID FLOW IN CLOSED CONDUITS - VOLUMETRIC METHODS - BY MASS
4 - PREFACE
7 - 1 General
7 - 1.1 Scope and field of application
7 - 1.2 References
7 - 1.3 Definitions
7 - 1.3.1 static weighing
7 - 1.3.2 dynamic weighing
7 - 1.3.3 diverter
7 - 1.3.4 flow stabilizer
7 - 1.3.5 buoyancy correction
7 - 1.4 Units
8 - 1.5 Notation
8 - 1.6 Certification
8 - 2 Principle
8 - 2.1 Statement of the principle
8 - 2.1.1 Static weighing
13 - 2.1.2 Dynamic weighing
13 - 2.1.3 Comparison of instantaneous and mean flow-rate
13 - 2.2 Accuracy of the method
13 - 2.2.1 Overall uncertainty on the weighing measurement
13 - 2.2.2 Requirements for accurate measurements
13 - 3 Apparatus
13 - 3.1 Diverter
14 - 3.2 Time-measuring apparatus
15 - 3.3 Weighing tank
15 - 3.4 Weighing machine
15 - 3.5 Auxiliary measurements
16 - 4 Procedure
16 - 4.1 Static weighing method
16 - 4.2 Dynamic weighing method
16 - 4.3 Common provisions
16 - 5 Calculation of flow-rate
16 - 5.1 Calculation of mass flow-rate
16 - 5.2 Calculation of volume flow-rate
16 - 6 Calculation of the overall uncertainty of the measurement of the flow-rate
16 - 6.1 Presentation of results
17 - 6.2 Sources of error
17 - 6.2.1 Systematic errors
18 - 6.2.2 Random errors
20 - 6.3 Calculation of uncertainty in flow-rate measurement
20 - 6.3.1 General
20 - 6.3.2 Example of calculation
22 - Annex A - Corrections on the measurement of filling time
22 - A.1 Static weighing method
22 - A.1.1 Method 1
22 - A.1.2 Method 2
23 - A.2 Dynamic weighing method
24 - Annex B - Density of pure water
25 - Annex C - Definition of terms and procedures used in error analysis
25 - C.1 Definition of the error
25 - C.2 Definition of uncertainty
25 - C.3 Definition of the standard deviation
25 - C.4 Assessment of uncertainty
25 - C.4.1 Random errors
25 - C.4.2 Systematic errors
26 - C.5 Propagation of errors
27 - Table - Values of Student’s

Abstract

Specifies a method for the determination of fluid flow, in a conduit running full, by measurement of the mass of water delivered into a weighing tank in a known time interval. The application is generally for fixed laboratory installations with flow rates of less than 1500 kL/s. It is identical with and has been reproduced from ISO 4185:1980.

Scope

This International Standard specifies a method of liquid flow-rate measurement in closed conduits by measuring the mass of liquid delivered into a weighing tank in a known time interval. It deals in particular with the measuring apparatus, the procedure, the method for calculating the flow-rate and the uncertainties associated with the measurement.
The method described may be applied to any liquid provided that its vapour pressure is such that any escape of liquid from the weighing tank by vaporization is not sufficient to affect the required measurement accuracy. Closed weighing tanks and their application to the flow measurement of liquids of high vapour pressure are not considered in this International Standard.
This International Standard does not cover the cases of corrosive or toxic liquids.
Theoretically, there is no limit to the application of this method which is used generally in fixed laboratory installations only. However, for economic reasons, usual hydraulic laboratories using this method can produce flow-rates of 1.5 m 3/s or less.
Owing to its high potential accuracy, this method is often used as a primary method for calibration of other methods or devices for mass flow-rate measurement or volume flow-rate measurement provided that the density of the liquid is known accurately.
It must be ensured that the pipeline is running full with no air or vapour pockets present in the measuring section.