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GB/T 21391-2022: Measurement of natural gas flow by turbine gas meters
Status: Valid GB/T 21391: Evolution and historical versions
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| GB/T 21391-2022 | English | 709 |
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Measurement of natural gas flow by turbine gas meters
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GB/T 21391-2022
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| GB/T 21391-2008 | English | 145 |
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Measurement of natural gas flow by turbine meter
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Basic data | Standard ID | GB/T 21391-2022 (GB/T21391-2022) | | Description (Translated English) | Measurement of natural gas flow by turbine gas meters | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E98 | | Word Count Estimation | 36,381 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 21391-2022: Measurement of natural gas flow by turbine gas meters---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 natural gas flow by turbine gas meters
ICS 75.180.30
CCSE98
National Standards of People's Republic of China
Replacing GB/T 21391-2008
Measuring Natural Gas Flow with Gas Turbine Flow Meters
Published on 2022-04-15
2022-11-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
directory
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 How it works 3
4.1 Structure and Principle 3
4.2 Factors Affecting Measurement Accuracy 4
5 Metrology performance4
5.1 General 4
5.2 Accuracy requirements 4
5.3 Repeatability5
5.4 Peak-to-peak error5
5.5 Short-term overload5
5.6 Operating temperature range5
5.7 Installation conditions 5
5.8 Maximum allowable pressure loss5
6 Flowmeter requirements5
6.1 General 5
6.2 Compressive strength and tightness 6
6.3 Connections and lengths of flowmeters 6
6.4 Pressure taking port 6
6.5 Removable flowmeter measuring cell 6
6.6 Lubrication 7
6.7 Electrical Safety 7
6.8 Output and display 7
6.9 Flowmeter marking 7
6.10 Appearance quality 8
6.11 Ability to adapt to the environment 8
6.12 Transport and storage8
6.13 Flow Accumulation 8
6.14 Smart Flow Meter 8
7 Installation requirements, use and maintenance 10
7.1 Installation environment 10
7.2 Pipeline configuration 10
7.3 Using 13
7.4 Maintenance and Inspection 14
8 Flow calculation method and estimation of measurement uncertainty 14
8.1 Standard reference conditions 14
8.2 Volume flow calculation 14
8.3 Mass Flow Calculation 15
8.4 Energy flow calculation 15
8.5 Estimation of measurement uncertainty 16
Appendix A (normative) Flow Calibration 18
Appendix B (informative) Other performance characteristics of flowmeters 25
Appendix C (Informative) Field Inspection of Flow Meters 28
Appendix D (Informative) Natural Gas Flow Calculation Example 29
Reference 32
Figure 1 Schematic diagram of the structure of a turbine flowmeter with a mechanical converter 3
Figure 2 Schematic diagram of the structure of a turbine flowmeter with an electronic converter 4
Figure 3 Recommended installation of typical metering lines with auxiliary equipment10
Figure 4 Short pipe installation method 11
Figure 5 Compact connection installation method 12
Figure 6 Dimensional parameters of the built-in flow conditioner 12
Table 1 Accuracy class and maximum allowable error5
Table 2 Demarcation flow (qt) 5
Table A.1 Calibration flow points 19
Table B.1 Ratings for Maximum Flow Dependent on Minimum Velocity and Nominal Diameter 26
Table B.2 When using air under normal pressure as the medium for testing at qmax, the maximum pressure loss of the flowmeter 26
Table D.1 Composition of natural gas for flow calculation example 29
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 of Standardization Documents"
drafted.
This document replaces GB/T 21391-2008 "Measurement of Natural Gas Flow Rate with Gas Turbine Flow Meters", which is consistent with GB/T 21391-2008
In addition to structural adjustments and editorial modifications, the main technical changes are as follows.
--- Increased the requirements for gas composition within the scope of GB/T 37124, and changed the chapters of the standard reference conditions (see Chapter 1 and
8.1, Chapters 1 and 8 of the.2008 edition);
--- Changed normative reference documents, all documents are currently valid documents (see Chapter 2, Chapter 2 of the.2008 edition);
--- Changed the definition of turndown ratio, K factor and boundary flow (see 3.1.2, 3.1.6 and 3.1.7, 3.1.2, 3.1.6 and.2008 editions)
3.1.7);
--- Added the definitions of measuring core, peak-to-peak error, intelligent flowmeter and real-flow calibration (see 3.1.8~3.1.11);
--- Changed the structure principle of the flowmeter, and added the schematic diagram of the typical turbine flowmeter of different types (see 4.1,.2008 edition
4.1);
--- Changed the repeatability requirements of the integrated flowmeter (see 5.3, 5.3 of the.2008 edition);
--- Increased the error requirement between peaks (see 5.4);
--- Change the airflow temperature range to the working medium and ambient conditions temperature range (see 5.7, 5.6 of the.2008 edition);
--- Changed the flow meter output and display (see 6.8, 6.8 of the.2008 edition);
--- Changed the technical requirements for related products of the integrated flowmeter, and added the function of energy measurement (see 6.14, 6.14 of the.2008 edition);
--- Changed the recommended installation method, merged the straight-through recommended installation method with the straight-through recommended installation method with auxiliary equipment, and deleted it
Suggestions on the location of temperature measuring holes in confined spaces and compact installations are presented, and these two installations are limited to integrated flow
meter (see 7.2.1, 7.2.1 of the.2008 edition);
--- Changed the expression of each standard uncertainty in uncertainty estimation, as well as the standard uncertainty of calorific value, pressure under standard reference conditions
The value of shrinkage factor and density standard uncertainty (see 8.5, 8.4 of the.2008 edition);
--- Changed the requirements for the uncertainty of the calibration standard device in Appendix A (see A.2.1, A.2.1 of the.2008 edition).
Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents.
This document is proposed and managed by the National Petroleum and Natural Gas Standardization Technical Committee (SAC/TC355).
This document is drafted by. National Petroleum and Natural Gas Mass Flow Metering Station Chengdu Branch, PetroChina Southwest Oil and Gas Co., Ltd.
Tian Branch, Natural Gas Sales Branch of PetroChina Co., Ltd., Xinjiang Coal-to-Gas Natural Gas Export Pipeline of State Pipeline Network Group Co., Ltd.
Co., Ltd. Huguang Branch, China Petroleum Engineering Construction Co., Ltd. Southwest Branch, National Pipeline Network Group West-East Gas Pipeline Branch,
National Pipe Network Group Southwest Pipeline Co., Ltd. Oil and Gas Measurement Center, Tianxin Instrument Group Co., Ltd.
The main drafters of this document. Ren Jia, Guo Xuming, Duan Jiqin, Xie Fuwen, He Min, Zhang Zhi, Huang He, Qiu Hui, Min Wei, Xia Shouhua, Yuan Pingfan,
Liu Dingfa, Tao Chaojian, Zhou Fang, Wu Shuhui.
This document was first published in.2008 and this is the first revision.
Measuring Natural Gas Flow with Gas Turbine Flow Meters
1 Scope
This document specifies the working principle, measurement performance, safety and security of gas turbine flowmeters (hereinafter referred to as flowmeters) for natural gas flow measurement.
Installation and maintenance, flow calculation and measurement uncertainty evaluation, real flow calibration and on-site inspection, etc.
This document is applicable to natural materials whose composition is within the range defined by GB 17820 and GB/T 37124 and whose true relative density is 0.55~0.80.
Air flow measurement.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations
documents, only the version corresponding to that date applies to this document. For undated references, the latest edition (including all amendments) applies to
this document.
GB/T 3836.1 Explosive Atmospheres Part 1.General Requirements for Equipment
GB/T 3836.2 Explosive Atmospheres Part 2.Equipment protected by flameproof enclosure "d"
GB/T 3836.4 Explosive Atmospheres Part 4.Equipment protected by intrinsically safe "i"
GB/T 4208 enclosure protection class (IP code)
GB/T 11062 Calculation method of calorific value, density, relative density and Wobbe index of natural gas
GB/T 13384 General technical conditions for packaging of mechanical and electrical products
GB/T 13610 Composition Analysis of Natural Gas - Gas Chromatography
GB/T 17747.1 Calculation of Natural Gas Compression Factor Part 1.Introduction and Guidelines
GB/T 17747.2 Calculation of Natural Gas Compression Factor Part 2.Calculation with Molar Composition
GB/T 17747.3 Calculation of Natural Gas Compression Factor Part 3.Calculation with Physical Property Values
GB 17820 Natural gas
GB/T 18603-2014 Technical requirements for natural gas metering system
GB/T 21446-2008 Measuring natural gas flow with standard orifice flowmeter
GB/T 25480 Basic environmental conditions and test methods for transportation and storage of instruments and meters
GB/T 35186 Performance Evaluation of Natural Gas Metering System
3 Terms, Definitions and Symbols
3.1 Terms and Definitions
The following terms and definitions apply to this document.
3.1.1
gas turbine flowmeter turbinegasmeter
Under the action of the fluid, the impeller is forced to rotate, and its rotational speed is a function of the fluid volume flow.
NOTE. The volumetric flow of fluid through the flowmeter is based on the number of impeller revolutions.
3.1.2
Turndown ratio rangeability/turndownratio
range degree
The ratio of the maximum flow rate to the minimum flow rate of the flowmeter within the maximum allowable error range.
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