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GB/T 45124-2024: Measurement of liquid flow in closed conduits - Volumetric method
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Measurement of liquid flow in closed conduits - Volumetric method
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GB/T 45124-2024
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Basic data | Standard ID | GB/T 45124-2024 (GB/T45124-2024) | | Description (Translated English) | Measurement of liquid flow in closed conduits - Volumetric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | N12 | | Classification of International Standard | 17.120.10 | | Word Count Estimation | 42,445 | | Date of Issue | 2024-12-31 | | Date of Implementation | 2025-07-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 45124-2024: Measurement of liquid flow in closed conduits - Volumetric method---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 17.120.10
CCSN12
National Standard of the People's Republic of China
Volumetric method for measuring liquid flow in closed pipes
Released on 2024-12-31
2025-07-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms, definitions and symbols 1
3.1 Terms and Definitions 1
3.2 Symbol 2
4 Principle 3
4.1 Principle Description 3
4.2 Metrological characteristics 5
5 Key components and technical requirements of the device 6
5.1 Commutator 6
5.2 Timer 8
5.3 Workload Meter 9
5.4 Liquid level measurement equipment 9
5.5 Calibration of the work volume instrument 9
5.6 Measurement and control system 10
6 Principle of the device10
6.1 Static volume method 10
6.2 Dynamic volume method 10
6.3 Dual Workload Method 11
6.4 General 11
7 Flow calculation 12
7.1 Calculation of volume flow 12
7.2 Calculation of mass flow 12
8 Evaluation of flow measurement uncertainty 12
8.1 General 12
8.2 Uncertainty Analysis 12
Appendix A (Informative) Example of a static volume flow device using the start-stop method 18
A.1 Principle 18
A.2 Test methods 19
A.3 Correction of volume measurement 20
Appendix B (Informative) Description of flow devices using the dynamic volume method 21
Appendix C (Normative) Amendment to measurement time 22
C.1 General 22
C.2 Static volume method 22
C.3 Dynamic volume method 25
Appendix D (Informative) Measurement and Control System 26
D.1 System composition 26
D.2 General functions 26
D.3 Schematic diagram of measurement control system structure 26
D.4 Schematic diagram of measurement control system software structure 27
D.5 Modular software block diagram example 27
D.6 Verification methods for software systems 28
Appendix E (Informative) Density of pure water at 101.325 kPa standard atmospheric pressure 30
Appendix F (informative) Correction of density measured by densitometer 32
Appendix G (Informative) Uncertainty Evaluation Calculation Example 33
G.1 Example Overview 33
G.2 Timer uncertainty 33
G.3 Commutator uncertainty 33
G.4 Volume measurement uncertainty 33
G.5 Temperature measurement uncertainty 34
G.6 Uncertainty table 34
G.7 Overall uncertainty of static volumetric liquid measurement device 34
Appendix H (Informative) tp(v) values (t values -) for t distribution with different confidence probabilities p and degrees of freedom v 35
Reference 37
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is modified to adopt ISO 8316.1987 "Measurement of liquid flow in closed conduits - Volumetric trough liquid collection method".
Compared with ISO 8316.1987, this document has made the following structural adjustments.
--- Appendix A corresponds to Appendix D in ISO 8316.1987;
--- Appendix B corresponds to Appendix C in ISO 8316.1987;
--- Appendix C corresponds to Appendix A in ISO 8316.1987;
--- Appendix E corresponds to Appendix B in ISO 8316.1987;
--- Appendix H corresponds to Appendix E in ISO 8316.1987.
The technical differences between this document and ISO 8316.1987 and their reasons are as follows.
--- Deleted the statement that the device needs to be subject to regular verification (see Chapter 1), which conflicts with the existing standards in my country;
--- Changed the symbol table (see 3.2) to comply with the latest provisions of ISO 5168;
--- Added two typical flow device schematics of static volume method (see 4.1.1), and changed the flow device principle of dynamic volume method
Figure (see 4.1.2) to better adapt to the current status of domestic device technology;
--- The optimal uncertainty of the device (see 4.2.1) has been changed to better adapt to the current status of domestic device technology;
--- Added the uncertainty table of standard devices (see Table 2) to better adapt to the current status of domestic device technology;
--- Added two accurate measurement requirements (i) and (j) (see 4.2.2) to reduce the source of error;
---Changed the cross-sectional length of the commutator trickle, added three open commutators and one closed commutator structure schematic diagram (see
5.1) to better adapt to the current status of domestic commutator technology;
--- Changed the commutation cycle reading scale value (see 5.2) because the commutation cycle scale value accuracy in the industry has been improved;
--- The minimum change requirement of the liquid level has been deleted. Due to different settings of the working volume, the minimum change of the liquid level is not necessarily 1m
(See 5.3 of ISO 8316.1987);
--- Changed the residual liquid discharge waiting time (see 5.5), based on the waiting time of the metal measuring vessel in the dripping state;
--- Added device software requirements (see 5.6), because existing standard devices in the industry basically have software;
--- Changed the principle description of the static volume method and the dynamic volume method (see 6.1 and 6.2) to better adapt to the current status of volume method technology;
--- Changed the number of measurements for each measuring point (see 6.4) to be consistent with the existing standards in my country;
--- The structure and content of Chapter 8 (see Chapter 8) have been changed to meet the uncertainty requirements in the existing standards of my country.
The following editorial changes were made to this document.
--- In order to coordinate with the existing standards, the name of the standard is changed to "Volumetric method for measuring liquid flow in closed pipes";
--- Added the one-way valve identification in the volume flow device schematic diagram of the static start-stop method (see A.1);
--- Added measurement control system (see Appendix D);
--- Changed the query table of pure water density under standard atmospheric pressure (see Appendix E);
--- Added correction for density measurement using a densitometer (see Appendix F);
--- Added uncertainty calculation examples (see Appendix G);
--- Changed the t distribution table (see Appendix H);
--- Deleted the reference to ISO 4185 and included the document as a reference.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Industrial Process Measurement, Control and Automation Standardization Technical Committee (SAC/TC124).
This document was drafted by. Guangzhou Energy Testing Institute, Shanghai Industrial Automation Instrumentation Research Institute Co., Ltd., National Water Large Flow Measurement
Station, Tianxin Instrument Group Co., Ltd., Endress+Hauser (China) Automation Co., Ltd., Kaifeng Instrument Co., Ltd., Beijing Metrology and Testing Bureau
Institute of Metrology, Jiangsu Institute of Metrology, Shanghai Institute of Metrology and Testing Technology, Tianjin Institute of Metrology Supervision and Inspection Science, Jinka
Water Technology Co., Ltd., Hubei Nankong Instrument Technology Co., Ltd., Chengdu Qinchuan Internet of Things Technology Co., Ltd., Yuyao Yinhuan Flow
Instrument Co., Ltd., Jiangsu Huaxia Instrument Co., Ltd., and Ruida Group Co., Ltd.
The main drafters of this document are. Lu Jiamin, Xiao Honglian, Hai Ning, Tao Chaojian, Liu Zetao, Hu Liangyong, Sun Yuxin, Ma Chunge, Yang Youtao,
Jiuying Cao, Xinhong Yao, Xin Shi, Changzheng Du, Rongtao Guan, Zehua Shao, Jiashun Zhu, Guangxin Sun, Yong Zou, and Li Liu.
Volumetric method for measuring liquid flow in closed pipes
1 Scope
This document describes a method for determining the flow rate of a liquid in a closed conduit by measuring the volume of liquid flowing into a working volume per unit time.
(hereinafter referred to as "volumetric method"), including principle, apparatus, implementation steps, flow calculation and measurement-related uncertainty assessment.
The method described in this document is applicable to liquids that meet the following conditions.
a) The measuring medium is a low vapor pressure liquid (to ensure that any liquid evaporating from the working volume does not affect the required measurement accuracy).
accuracy);
b) low viscosity (will not change or unduly delay the measurement of the liquid level in the working volume);
c) Non-toxic and non-corrosive characteristics.
Theoretically, there is no limit to the application of this method, but for practical reasons this measurement method is usually used for flow rates less than
5400m3/h occasions and laboratory fixed devices. However, this method has a natural or artificial reservoir as the volume tank
This document does not cover such applications.
Due to the high accuracy of this method, it is often used as a benchmark method to calibrate other volume flow measurement or mass flow measurement.
For calibrating mass flow measuring devices, the density of the liquid needs to be known accurately.
If the volumetric flow measurement device is used for statutory measurement, it must undergo measurement standard assessment and authorization.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
Note. GB/T 17611-1998 Measurement terms and symbols for fluid flow in closed pipes (ISO 4006.1991, IDT)
Note. GB/T 27759-2011 Fluid flow measurement uncertainty assessment procedure (ISO 5168.2005, IDT)
3 Terms, definitions and symbols
3.1 Terms and Definitions
For the purpose of this document, the terms and definitions defined in ISO 4006 and ISO 5168 and the following apply.
3.1.1
Static volume method staticgauging
During the actual measurement time interval, the liquid level is measured before and after the liquid enters the calibration measuring container (i.e., volume measurement) to calculate the
Method of measuring the net volume of liquid collected.
[Source. GB/T 17611-1998, 12.2.1, modified]
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