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GB/T 20728-2021: Measurement of fluid flow in closed conduits - Guidance to the selection, installation and use of Coriolis flowmeters
Status: Valid GB/T 20728: Evolution and historical versions
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| GB/T 20728-2021 | English | 624 |
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Measurement of fluid flow in closed conduits - Guidance to the selection, installation and use of Coriolis flowmeters
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GB/T 20728-2021
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| GB/T 20728-2006 | English | RFQ |
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Measurement of fluid flow in closed conduits -- Guidance to the selection, installation and use of Coriolis meters
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GB/T 20728-2006
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Basic data | Standard ID | GB/T 20728-2021 (GB/T20728-2021) | | Description (Translated English) | Measurement of fluid flow in closed conduits - Guidance to the selection, installation and use of Coriolis flowmeters | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | N12 | | Word Count Estimation | 34,370 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 20728-2021: Measurement of fluid flow in closed conduits - Guidance to the selection, installation and use of Coriolis flowmeters
---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.
Measurement of fluid flow in closed conduits - Guidance to the selection, installation and use of Coriolis flowmeters
ICS 17.120.10
N12
National Standards of People's Republic of China
Replace GB/T 20728-2006
Measurement of fluid flow in closed pipes
Guide for selection, installation and use of Coriolis flowmeter
[ISO 10790.2015,Measurementoffluidflowinclosedconduits-
(massflow,densityandvolumeflow measurements),IDT)
Released on 2021-08-20 and implemented on 2022-03-01
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Terms, definitions, symbols and abbreviations 1
3.1 Specific terminology of this standard 1
3.2 Quoting the definition of VIM, ISO /IEC Guide99 (JCGM.2012) 3
3.3 Symbol 3
3.4 Abbreviations 5
4 Selection criteria for Coriolis flowmeter 5
4.1 General 5
4.2 Installation 6
4.3 Influence of process conditions and fluid characteristics 7
4.4 Pressure loss 9
4.5 Security 9
4.6 Transmitter (secondary device) 10
4.7 Diagnosis 10
5 Inspection and adaptability 10
6 Mass flow measurement 11
6.1 Equipment 11
6.2 Mass flow measurement 13
6.3 Factors affecting mass flow measurement 14
6.4 Zero point adjustment 15
6.5 Calibration of mass flow measurement 15
7 Density measurement 16
7.1 General 16
7.2 Working principle 16
7.3 Relative density of fluid 16
7.4 Uncertainty of density measurement 17
7.5 Factors affecting density measurement 17
7.6 Density calibration and adjustment 18
8 Measurement of volume flow under measurement conditions 18
8.1 General 18
8.2 Volume calculation 18
8.3 The process fluid is a gas 19
8.4 Uncertainty of volume measurement 19
8.5 Special effects 19
8.6 Factory calibration 19
8.7 Volume detection 20
Appendix A (informative appendix) Calibration technique 21
Appendix B (informative appendix) Coriolis flowmeter selection safety guide 24
Appendix C (informative appendix) Considerations for multi-component liquid systems 26
Appendix D (informative appendix) Containing miscible liquids without chemical reaction components 28
Reference 30
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 20728-2006 "Selection, installation and use of Coriolis flowmeters for measurement of fluid flow in closed pipes"
User Guide. Compared with GB/T 20728-2006, the main technical changes are as follows.
---Modified the expression of "scope" (see Chapter 1);
---Modified the definition of the terms "repeatability", "measurement uncertainty" and "error" (see 3.2.1, 3.2.2, 3.2.3);
--- Deleted the terms "flow calibration coefficient", "density calibration coefficient", "relative humidity", "blocked flow", "shock wave", and "critical nozzle" (see.2006
Version 2.9.1, 2.9.2, 2.14, 2.15, 2.16, 2.17);
---The term "calibration" has been added (see 3.2.4);
---Added the symbols and abbreviations used in this standard (see 3.3, 3.4);
---Deleted the accuracy content (see the.2006 version of 3.2, 5.2, 6.4, 7.3);
---Modified the description of the influence of "multiphase flow" (see 4.3.3);
---Modified the description of "Pulsating Flow Influence" (see 4.3.7);
---The description of "diagnostic function" has been added, and related content has been added (see 4.7);
---Modified the description of "inspection and adaptability" (see Chapter 5);
---Modified the description of the "working principle" of mass flow measurement (see 6.1.1);
---Modified the description of "Detection element of Coriolis flowmeter" (see 6.1.2);
---Added the content of "mass flow measurement" (see 6.2);
---Modified the description of "zero point adjustment" (see 6.4);
---Modified the description and calculation formula of the "working principle" of density measurement (see 7.2);
---Modified the symbol and calculation formula of "relative density" (see 7.3);
---Added the "Uncertainty of Density Measurement" (see 7.4);
---Modified the description of "factors affecting density measurement" (see 7.5);
--- Modified the description of "Manufacturer's Density Calibration" and "On-site Density Calibration and Adjustment" (see 7.6.2, 7.6.3);
---Added "Process fluid is a gas" and "Uncertainty of volume measurement" (see 8.3, 8.4);
--- Deleted the "additional measurement" content (see Chapter 8 of the.2006 edition);
--- Deleted the content of the normative appendix "Guide to Gas Measurement" (see Appendix E of the.2006 edition).
The translation method used in this standard is equivalent to ISO 10790.2015 "Selection of Coriolis Flowmeter for Measurement of Fluid Flow in Closed Pipes"
Type, installation and use guide (mass flow, density and volume flow measurement)".
The Chinese documents that have a consistent correspondence with the international documents cited in this standard are as follows.
---GB/T 27759-2011 fluid flow measurement uncertainty evaluation procedure (ISO 5168.2005, IDT);
---GB/T 27025-2019 General requirements for the competence of testing and calibration laboratories (ISO /IEC 17025.2017, IDT);
---JJF1001-2011 General measurement terms and definitions (refer to ISO /IEC Guide99.2007).
This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Industrial Process Measurement Control and Automation Standardization Technical Committee (SAC/TC124).
Drafting organizations of this standard. Shanghai Inspection and Testing Institute of Instrumentation and Automatic Control System Co., Ltd., Shanghai Institute of Industrial Automation and Instrumentation Co., Ltd.
Company, Hefei Jingda Instrument Co., Ltd., Emerson Process Control Co., Ltd., Jiangsu Institute of Metrology, Dalian Zhonglong Instrument Co., Ltd.
Company, Xi’an Dongfeng Electric Co., Ltd., China Petroleum & Chemical Corporation Natural Gas Branch Metrology Research Center, China Metrology
University, Cologne Measurement Technology (Shanghai) Co., Ltd., Chengdu Andison Measurement Co., Ltd., Endress+Hauser (China) Automation Co., Ltd.,
Shenzhen Wanxun Automation Control Co., Ltd., Zhejiang Water Conservancy and Hydropower Institute, Guangzhou Energy Testing and Research Institute, Tokyo Planning Co., Ltd., Taiyuan Taihangliu
Quantum Engineering Co., Ltd., Tianxin Instrument Group Co., Ltd., Shanghai Institute of Metrology and Testing Technology.
The main drafters of this standard. Song Yanyong, Xiao Honglian, Liu Jie, Ji Ming, Cao Jiuying, Wang Xiting, Zhang Peng, Xu Ming, Cai Yijia, Xie Dailiang, Wang Jiefei,
Chen Zhe, Qing Houyan, Zou Jing, Ma Longbo, Lu Jiamin, Li Zhenzhong, Ye Yang, Tao Chaojian, Zhang Jinming, Meng Huibin.
The previous versions of the standard replaced by this standard are as follows.
--- This standard was first published in December.2006, and this is the first revision.
Measurement of fluid flow in closed pipes
Guide for selection, installation and use of Coriolis flowmeter
1 Scope
This standard provides guidelines for the selection, installation, calibration, performance and operation of Coriolis flowmeters for measuring mass flow and density. This standard
The standard also appropriately considers the type of fluid to be measured, and provides guidelines for the measurement of fluid volume flow and other related parameters.
Note. Fluid refers to air, natural gas, water, oil, liquefied petroleum gas, liquefied natural gas, artificial gas, mixed gas, various slurries, etc.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
ISO 5168 Fluid Flow Measurement Uncertainty Evaluation Procedure (Measurementoffluidflow-Proceduresforthe
evaluationofuncertainties)
ISO /IEC 17025 General requirements for the competence of testing and calibration laboratories (General requirements for the competition of
testingandcalibrationlaboratories)
ISO /IEC Guide99.2007 (JCGM200.2012) International Metrology Vocabulary Fundamentals and General Concepts and Related Terminology [In-
ternationalvocabularyofmetrology-Basicandgeneralconceptsandassociatedterms(VIM)]
3 Terms, definitions, symbols and abbreviations
3.1 Specific terms of this standard
The following terms and definitions apply to this document.
3.1.1
Coriolisflowmeter Coriolisflowmeter
It is composed of a flow detection element (primary device) and a transmitter (secondary device), which uses the interaction of fluid and vibration tube vibration to measure quality
A device for measuring flow and density.
Note. Coriolis flowmeter can also measure the temperature in the vibrating tube.
3.1.2
Flow detection element (primary device) flowsensor (primarydevice)
A mechanical assembly composed of a vibrating tube, a driving system, a measuring sensor element, a supporting mechanism and a housing.
3.1.3
Transmitter (secondary device) transmitter (secondary device)
Provides an electronic control system that drives and converts the signal from the flow detection element, produces the measured parameter and the derived parameter output.
Note 1.It can also provide corrections derived from parameters (such as temperature parameters).
Note 2.The transmitter (secondary device) can be installed as a whole on the flow detection element (primary device) (compact device), or it can be connected away from the primary device with a wire.
Connect to remote installation.
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