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Natural gas - Gas sampling
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GB/T 13609-2025
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Natural gas sampling guidelines
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Natural gas sampling guidelines
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Natural Gas--Sampling guidelines
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Sampling method of natural gas
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Basic data | Standard ID | GB/T 13609-2025 (GB/T13609-2025) | | Description (Translated English) | Natural gas - Gas sampling | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E24 | | Classification of International Standard | 75.060 | | Word Count Estimation | 62,647 | | Date of Issue | 2025-10-31 | | Date of Implementation | 2026-05-01 | | Older Standard (superseded by this standard) | GB/T 13609-2017 | | Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China | GB/T 13609-2025: Natural gas - Gas sampling---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 75.060
CCSE24
National Standards of the People's Republic of China
Replaces GB/T 13609-2017
Natural gas sampling
(ISO 10715.2022, MOD)
Published on 2025-10-31
Implemented on May 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface V
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Safety Precautions 3
5 Sampling Principles 3
6 representative samples 3
7 Sampling Types 4
7.1 Sampling Method 4
7.2 Sampling 4
7.3 Taking cumulative samples 7
7.4 Online or direct sampling 8
8 Sampling Locations 10
8.1 General Requirements 10
8.2 Sampling Location 10
8.3 Probe Area 11
8.4 Sampling Point 11
9.Technical Factors 12
9.1 General Requirements 12
9.2 Gas Adsorption 12
9.3 Materials used for sampling 13
9.4 Sample contamination 15
9.5 Sample condensation 15
9.6 Flow interference through the sampling system 17
9.7 Delay time 18
10 Sampling equipment 19
10.1 General Requirements 19
10.2 Sampling probe 20
10.3 Catheter 22
10.4 Filters, Membranes, and Separators 23
10.5 Valves and Safety Valves 24
10.6 Accessories 24
10.7 Traffic Monitoring 24
10.8 Pressure reducing device 24
10.9 Pressure Transmitter/Pressure Gauge 24
10.10 Heating device 25
10.11 Seals and Lubricants 25
10.12 Sample container or gas cylinder 25
10.13 Concentration Unit 27
10.14 Quantity and sequence of equipment 27
11 System Verification 27
12 Troubleshooting 28
Appendix A (Informative) Purpose of Sampling, Types of Compounds, and Information in the Sampling Report 30
A.1 Sampling Purpose 30
A.2 Components and Composition Range 30
A.3 Sampling Report Information 30
Appendix B (Informative) Sampling Procedure 31
B.1 Procedure for low-pressure sampling into fiberglass cylinders 31
B.2 Sampling Procedure Using the Inflation and Evaporation Method 32
B.3 Sampling Procedure Using Controlled Flow Method 34
B.4 Sampling Procedure Using Evacuated Containers 35
B.5 Sampling Procedure Using Insulation and Pressure Holding Method 36
Appendix C (Informative) Sample Quantity. 38
Appendix D (Informative) Vortex Detachment and Related Issues 40
Appendix E (Informative) Joule-Thomson Cooling Effect and Phase Behavior 42
Appendix F (Informative) Gas Adsorption and Desorption Effects. Adsorption/Desorption 45
Appendix G (Informative) Instructions for Calculating Stay Time 46
Appendix H (Informative) Cleaning of Sampling Gas Cylinders 51
Appendix I (Informative) Validation Procedure for Gas Sampling Systems 52
References 53
Figure 1.Schematic diagram of direct and indirect sampling methods.
Figure 2.Example of direct probe sampling.
Figure 3.Example of sampling by a non-adjustable, non-reduced pressure probe with a pre-treatment housing. (9)
Figure 4.Sampling location diagram 10
Figure 5.Schematic diagram of the probe area.
Figure 6.Sampling point diagram 12
Figure 7.Phase diagram of a typical natural gas mixture. (16)
Figure 8 Natural Gas Pressure/Temperature Phase Diagram 17
Figure 9 Schematic diagram of straight tube probe 20
Figure 10 Schematic diagram of pressure reduction adjustment probe 21
Figure 11 Schematic diagram of Pitot tube probe 22
Figure 12 Schematic diagram of the filter 23
Figure 13 Schematic diagram of a single-chamber standard gas cylinder 26
Figure 14 Schematic diagram of the moving piston gas cylinder 26
Figure B.1 Glass sample container (1L) 31
Figure B.2 Schematic diagram of sampling using a glass gas cylinder 31
Figure B.3 Schematic diagram of the sampling process from a pipeline at sub-atmospheric pressure 32
Figure B.4 Schematic diagram of inflation and deflation method 33
Figure B.5 Schematic diagram of the flow control method 34
Figure B.6 Schematic diagram of the evacuation method 36
Figure B.7 Schematic diagram of pressure holding sampling method 36
Figure B.8 Schematic diagram of thermal insulation sampling method 37
Figure D.1 Vortex-induced vibration 40
Figure D.2 Eddy flow patterns generated at different Reynolds number stages 41
Figure E.1 Phase behavior of air/water mixture 42
Figure E.2 Phase behavior of methane/nonane mixture 43
Figure E.3 Phase behavior of actual natural gas 44
Figure G.1 Functional relationship between purging time and flow rate (pipe inner diameter 3mm) 47
Figure G.2 Functional relationship between inlet pressure and outlet flow rate (pipe inner diameter 4mm) 47
Figure G.3 Functional relationship between inlet pressure and outlet flow rate (pipe inner diameter 5mm) 48
Figure G.4 shows the residence time and delay time block diagram considering both congested flow conditions and the absence of a fast loop.
Table 1.Compatibility of Sampling System Materials with Gas Components 14
Table 2.Equipment required for sampling under different circumstances 28
Table 3.Remedies and Preventive Measures for Common Problems in Sampling 29
Table B.1 Relationship between air pressure and purging frequency (Table 33)
Table G.1 and Figure G.4 show examples of dwell times and delay times for fast loop scenarios. (Example 49)
Example 50 of dwell time and delay time without fast loop in Table G.2 and Figure G.4.
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document supersedes GB/T 13609-2017 "Guidelines for Natural Gas Sampling". Compared with GB/T 13609-2017, except for structural adjustments and revisions...
Aside from the logical changes, the main technical changes are as follows.
a) The description of pressure in the scope has been removed (see Chapter 1 of the.2017 edition);
b) The terms "absorption," "adsorption," "pollutant," "desorption," "sampling location," and "sampling site" have been added (see 3.1, 3.2, 3.3, 3.4, 3.18).
3.20);
c) The terms "flow ratio accumulator sampler", "liquid separator", "low-pressure natural gas", "transmission conduit", and "water dew point" have been removed (see.2017 edition).
(2.3, 2.8, 2.9, 2.19, 2.20)
d) Safety precautions have been added (see Chapter 4);
e) Sampling principles have been added (see Chapter 5);
f) A representative sample was added (see Chapter 6);
g) Increased sampling locations (see Chapter 8);
h) Added general requirements (see 9.1), precautions for adsorption of sampling equipment (see 9.2.3), equilibration of sampling equipment (see 9.2.4), and delay.
Time (see 9.7);
i) A concentration unit was added (see 10.13);
j) The number and order of the equipment have been increased (see 10.14);
k) Added system verification (see Chapter 11);
l) Added troubleshooting (see Chapter 12).
This document is modified to adopt ISO 10715.2022 "Natural gas sampling".
This document has undergone the following structural adjustments compared to ISO 10715.2022.
a) Requirements related to the heat preservation and pressure-holding sampling method have been added (see 7.2.8), and the subsequent chapter numbers will be adjusted accordingly;
b) Requirements for gas sampling bags have been added (see 10.12.4), and subsequent chapter numbers will be adjusted accordingly;
c) The order of the appendices has been adjusted according to the order in which they appear in the main text.
The technical differences between this document and ISO 10715.2022, and the reasons therefor, are as follows.
a) ISO 14532 (see Chapter 3) has been replaced with the normatively referenced GB/T 20604 to adapt to my country's technical conditions and improve standards.
Quasi-applicability;
b) The terms "gas adsorption effect," "liquid separator," "trace components," and "wet surface" have been removed (see section 3.7 of ISO 10715.2022).
3.12, 3.24, 3.26);
c) The requirements for safety precautions have been changed (see Chapter 4 of ISO 10715.2022);
d) Added "7.2.8 Sampling Method Based on Insulation and Pressure" to adapt to the actual sampling needs of natural gas production in my country and improve standard operating procedures.
Actual nature;
e) Added "10.12.4 Gas Sampling Bag" to meet the actual needs of sample containers for natural gas sampling in my country and improve standard operating procedures.
Acting.
The following editorial changes have been made to this document.
a) Move "Note 2.'Sampling location' is not defined the same as 'sampling point' or 'sampling position'" in 8.4 to "Note. 'Sampling location' is defined differently from 'sampling point' or 'sampling position'" in 3.2.
The definitions of 'location', 'sampling point', and 'sampling location' are not the same.
b) The numbering of terms and definitions has been corrected; ISO 10715.2022 does not include 3.25.
c) Added “B.5 Sampling procedure using heat preservation and pressure preservation method”.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Natural Gas (SAC/TC244).
This document was drafted by. Natural Gas Research Institute, Southwest Oil & Gas Field Branch, China National Petroleum Corporation; China National Petroleum Corporation.
Southwest Oil and Gas Field Branch of PetroChina Company Limited, Gas Transmission Management Department of Southwest Oil and Gas Field Branch of PetroChina Company Limited, Shenzhen Hai
Industrial Products Testing Technology Center, Southwest Petroleum University, Tarim Oilfield Branch of China National Petroleum Corporation, National Pipeline Network Group
United Pipeline Co., Ltd. West-East Gas Pipeline Branch, China National Petroleum Corporation North China Oilfield Branch, China Petroleum & Chemical Corporation
China National Petroleum Corporation East China Oil & Gas Branch, China National Petroleum Corporation Changqing Oilfield Branch, Dazhou Municipal Bureau of Quality and Technical Supervision
Testing and Inspection Center.
The main drafters of this document are. Chen Yong, Zhu Jin, Zhang Peiying, Zeng Wenping, Song Kejing, Lin Qingjin, Ding Sijia, Chen Xuefeng, He Min, and Chen Guofeng.
Du Shuang, Guo Xiao, Tu Menggele, Tong Yuanhui, Liu Zhe, Zhou Lei, Zhao Boya, Gao Hequn, Fan Xiaojun, Gao Chunhua, Zhu Yongde, Wang Yuxia, Wang Qingyuan
Wang Sen.
The release history of this document and the document it replaces is as follows.
---First published as GB/T 13609-1992 in.1992, revised for the first time in.1999, revised for the second time in.2012, and revised again in.2017.
Three revisions;
---This is the fourth revision.
Natural gas sampling
1 Scope
This document describes a sampling method for obtaining representative natural gas samples, including natural gas delivered to the gas transmission and distribution network.
and natural gas substitutes.
This document applies to on-site sampling of natural gas. The obtained samples are used to measure and monitor the gas interchangeability and energy of the gas entering the pipeline network.
It is applicable to sampling at cross-border and trade-transfer metering stations. This document applies only to dry natural gas (single-phase, i.e., typically transported via natural gas pipelines).
Sampling of the transported gas.
This document does not apply to moisture (two-phase or three-phase) sampling.
Note 1.This document does not cover safety issues related to gas sampling.
Note 2.This document takes into account sampling of specific gases, see Appendix A.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 20604 Natural Gas Vocabulary
3 Terms and Definitions
The terms and definitions defined in GB/T 20604 and the following terms and definitions apply to this document.
3.1
absorption
When a gas mixture comes into contact with a liquid, one or more components are extracted from the gas.
Note 1.During the absorption or extraction process, the absorbent material will undergo (or be accompanied by) some physical and/or chemical changes.
Note 2.Gas components are retained due to capillary action, osmosis, chemical action, or dissolution. For example, water is removed from natural gas using glycol (ethylene glycol).
3.2
adsorption
Using physical or chemical forces to retain gas molecules, dissolved substances, or liquids on the surface of a solid or liquid in contact with them.
Example. Retention of carbon in methane.
3.3
pollutant
Components such as particulate matter, ethylene glycol, and compressor oil, which are present in very low concentrations, are considered interfering components and are not part of the gas to be sampled.
Note 1.Contaminants are generally harmful to analytical equipment. If contaminants enter the sampling process, they must be removed from the sample before entering the analytical unit.
Once contaminants enter the sampling process, they will continue to affect any subsequent samples that come into contact with them. Over time, the contaminants in the sampling system will...
The accumulation of contaminants can affect the sample, making it no longer representative.
Note 2.Do not confuse contaminants with the inherent trace components of the gas being sampled.
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GB/T 13609-2025: Natural gas - Gas sampling
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