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GB/T 35138-2017: Measurement of fluid flow in closed conduits -- Ultrasonic transit-time meters for liquid
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Measurement of fluid flow in closed conduits -- Ultrasonic transit-time meters for liquid
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GB/T 35138-2017
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Basic data | Standard ID | GB/T 35138-2017 (GB/T35138-2017) | | Description (Translated English) | Measurement of fluid flow in closed conduits -- Ultrasonic transit-time meters for liquid | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | N12 | | Classification of International Standard | 17.120.10 | | Word Count Estimation | 66,643 | | Date of Issue | 2017-12-29 | | Date of Implementation | 2018-07-01 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 35138-2017: Measurement of fluid flow in closed conduits -- Ultrasonic transit-time meters for liquid
---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-Ultrasonic transit-time meters for liquid
ICS 17.120.10
N12
National Standards of People's Republic of China
Measurement of fluid flow in closed pipes
Transit time liquid ultrasonic flowmeter
(ISO 12242.2012, IDT)
Published on.2017-12-29
2018-07-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration released
Directory
Preface III
1 Scope 1
2 Normative references 1
3 Terms, definitions, symbols, and abbreviations 1
3.1 Quantity 1
3.2 Flowmeter Structure 2
3.3 Thermal Conditions 3
3.4 Statistics 3
3.5 Calibration 5
3.6 Symbols and Subscripts 5
3.7 Abbreviations 6
4 Measurement principle 7
4.1 Overview 7
4.2 Volume flow 8
4.3 Basic Type Description 8
4.4 Time Delay 12
4.5 Refraction 12
4.6 Reynolds Number 13
4.7 Temperature and Pressure Corrections 13
5 Performance Requirements 13
6 Measurement uncertainty 14
6.1 General 14
6.2 Uncertainty component assessment 14
7 Installation 16
7.1 General 16
7.2 Use of standard equipment 16
7.3 Laboratory Calibration or Theoretical Prediction 16
7.4 Other Installation Impacts 18
8 Test and Calibration 19
8.1 General 19
8.2 Single Test - Using Theoretical Prediction 19
8.3 Single Test - Flow Calibration in Flow Conditions 19
9 Performance Test 21
9.1 General 21
9.2 Repeatability and Reproducibility 21
9.3 Additional Tests for Transducers Installed on External Flowmeters 22
9.4 Uncertainty assessment of flowmeters for predicting performance using theoretical prediction
9.5 Liquid-mechanical conditions 22
9.6 Analog Channel Failure and Replacement Components 23
10 Characteristics of Flowmeters 23
10.1 Body, Material and Structure 23
10.2 Transducer 24
10.3 Electronic Components 25
10.4 Software 25
10.5 Replacement Parts 26
10.6 Determining Density and Temperature 26
11 actual operation 27
11.1 General 27
11.2 Verification Process 27
11.3 Running Diagnostics 28
11.4 Verification tracking, mutual comparison and inspection during operation 30
11.5 Recalibration 30
Appendix A (Normative) Temperature and Pressure Correction 35
Appendix B (Informative) Impact of Roughness Changes 41
Appendix C (Informative) Uncertainty Calculation Example 44
Appendix D (Informative) Documentation 55
Reference 57
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard uses the translation method equivalent to the use of ISO 12242.2012 "Measurement of fluid flow in closed pipes. Transit time method Liquid ultrasound
Flowmeter.
The Chinese documents that are consistent with the international documents that are normatively referenced in this standard are as follows.
--- GB/T 17611-1998 Terms and symbols for measurement of fluid flow in closed pipes (idt ISO 4006.1991)
This standard is proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Industrial Process Measurement, Control, and Automation Standardization Technical Committee (SAC/TC124).
This standard was drafted by. Shanghai Industrial Automation Instrument Research Institute, Beijing Ruipu Sanyuan Instrument Co., Ltd., Beijing Changmin Technology Co., Ltd.
Division, Shenzhen Jianheng Measurement & Control Co., Ltd., Zhejiang Tianxin Instrument Technology Co., Ltd., Ningbo Water Meter Co., Ltd., Zhejiang Diyuan Instrument Co., Ltd.
Limited company.
The main drafters of this standard. Li Minghua, Li Zhenzhong, Pu Qihuan, Xiao Cong, Chen Weigang, Yao Ling, Ye Jianjun, Lu Tingting.
Measurement of fluid flow in closed pipes
Transit time liquid ultrasonic flowmeter
1 Scope
This standard specifies the use of ultrasonic signal transit time to measure liquid ultrasonic flowmeters in one-way homogeneous liquid flow in closed pipes.
(Hereinafter referred to as. flow meter) Terms, symbols and abbreviations, measurement principles, performance, calibration, output characteristics, and installation conditions.
This standard has no restrictions on the maximum or minimum size of the flowmeter.
This standard applies to the presence or absence of a dedicated verification (calibration) system, the use of plug-in and clip-on transducers (for beam refraction and beam
Refraction of two configurations of flowmeters, including metered flowmeters and flowmeters with field mounted transducers.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
ISO 4006 Measurement terms and symbols for fluid flow in closed pipes (Measurementoffluidflowinclosedcon-
duits-Vocabularyandsymbols)
3 Terms, definitions, symbols and abbreviations
The terms and definitions defined by ISO 4006 and the following apply to this document.
3.1 Quantity
3.1.1
Volume flowrate
qV
qV=
dV
Dt
In the formula.
V --- volume;
t --- time.
Note. Rewrite ISO 80000-4.2006[41], definition 4-30.
3.1.2
Measuring pressure meteringpressure
The fluid pressure in the flowmeter associated with the indicated volume under flow conditions.
3.1.3
Mean velocity within the meterbody
The fluid flow is divided by the cross-sectional area of the body.
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