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GB/T 7778-2017: [Including 2019XG1, 2020XG2] Number designation and safety classification of refrigerants
Status: Valid GB/T 7778: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7778-2017 | English | 1319 |
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[Including 2019XG1, 2020XG2] Number designation and safety classification of refrigerants
| Valid |
GB/T 7778-2017
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| GB/T 7778-2008 | English | 759 |
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4 days [Need to translate]
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Number designation and safety classification of refrigerants
| Obsolete |
GB/T 7778-2008
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| GB/T 7778-2001 | English | 639 |
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Number designation and safety classification of refrigerants
| Obsolete |
GB/T 7778-2001
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| GB/T 7778-1987 | English | RFQ |
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3 days [Need to translate]
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Number designation of refrigerants
| Obsolete |
GB/T 7778-1987
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PDF similar to GB/T 7778-2017
Basic data | Standard ID | GB/T 7778-2017 (GB/T7778-2017) | | Description (Translated English) | [Including 2019XG1, 2020XG2] Number designation and safety classification of refrigerants | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J73 | | Classification of International Standard | 27.200 | | Word Count Estimation | 66,649 | | Date of Issue | 2017-05-12 | | Date of Implementation | 2017-12-01 | | Older Standard (superseded by this standard) | GB/T 7778-2008 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic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 7778-2017: [Including 2019XG1, 2020XG2] Number designation and safety classification of refrigerants
---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.
[Including.2019XG1] Number designation and safety classification of refrigerants
ICS 27.200
J73
National Standards of People's Republic of China
Replace GB/T 7778-2008
Refrigerant numbering method and safety classification
(ISO 817.2014, Refrigerants-Designationandsafetyclassification, MOD)
Released on.2017-05-12
2017-12-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword I
1 Scope 1
2 Normative references 1
3 Terms and definitions, abbreviations and symbols 1
4 refrigerant number method 6
5 means method 9
6 Security Classification 9
7 Refrigerant number and safety classification 12
8 Refrigerant concentration limit (RCL) 12
Appendix A (informative) Representation of the numbering of isomers in refrigerants
Appendix B (Normative) Flammability Test and Fractionation Analysis 24
Appendix C (informative) Test method for measuring the burning rate of flammable gases 28
Appendix D (Normative Appendix) RCL and ATEL Calculation for Mixed Refrigerants 44
Appendix E (informative) Data used to determine safety classifications and RCL values 46
Appendix F (Informative Appendix) Application Notes 53
References 59
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 7778-2008 "Refrigerant Numbering Method and Safety Classification". This standard is in line with GB/T 7778-2008
The changes in the main technical content are as follows.
--- Increased the amount of refrigerant;
--- Increased propylene and ether based refrigerant numbering methods;
--- Revised the numbering method for other organic and inorganic compounds;
--- Revised the classification of toxicity, from A, B, C to A, B;
--- Modified the flammability classification, adding 2L weak flammable class;
--- Increased the method of determining the refrigerant concentration limit RCL;
--- Table 5 added some refrigerant, and increased LFL, ATEL, RCL column;
--- Add a "A.3 propane isomer" and "A.4 stereoisomer example" in Appendix A;
--- Deleted the original standard Appendix B old and new standard safety classification comparison table;
--- Added Appendix B flammability test and fractionation analysis;
--- Added Appendix C to test methods for measuring the burning rate of combustible gases;
--- Added RCL and ATEL calculations for Appendix D mixed refrigerants;
--- Added Appendix E to determine the safety classification and RCL values;
--- Added Appendix F application notes.
This standard uses the redrafting method to modify the use of ISO 817.2014 "Refrigerant Naming and Safety Classification".
The technical differences between this standard and ISO 817.2014 and their reasons are as follows.
---About the normative reference documents, this standard has made technical adjustments to adapt to China's technical conditions, specific adjustments
To. replace ASTME681 with GB/T 21844;
--- Regarding the definition of "occupational exposure limit value", the indicator in ISO 817 is based on relevant national regulations. This standard is for China
The national conditions have increased the regulations that can be referred to in our country (see Note to 3.1.28);
--- Delete the upper corner note b in Table 6, and adjust the original upper corner notes c, d to b, c;
--- Appendix B refers to the reference to Figure B.1 in ANSI/ASHRAE34-2013, which is directly included in this standard after this revision.
Medium (see Appendix B, B.1);
--- The nature of Appendix F was changed from a normative appendix to an informative appendix. Because Appendix F involves applying for refrigerant from a foreign institution.
Numbering.
This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Refrigeration and Air Conditioning Equipment Standardization Technical Committee (SAC/TC238).
This standard is drafted by. Hefei General Mechanical and Electrical Products Testing Institute Co., Ltd., Ningbo Bolang Thermal Energy Technology Co., Ltd., Hefei General
Mechanical Research Institute, Hefei General Environmental Control Technology Co., Ltd.
The main drafters of this standard. Zhang Mingsheng, Wu Junfeng, Wang Jiping, Li Zhiliang, Jia Lei, Ma Guangyu, Li Yayun.
The previous versions of the standards replaced by this standard are.
---GB/T 7778-1987, GB/T 7778-2001, GB/T 7778-2008.
Refrigerant numbering method and safety classification
1 Scope
This standard specifies the method for the numbering of refrigerants, the method for safely classifying refrigerants based on toxicity and flammability data, and
A method of determining the refrigerant concentration limit.
This standard applies to refrigerants used in refrigeration and air conditioning equipment and installations.
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 edition (including all amendments) applies to this document.
GB/T 21844 Standard Test Method for Flammability Concentration Limits of Compounds (Vapours and Gases)
ANSI/ASHRAE34 Renaming and Safety Classification of Refrigerants (Designationsafetyclassificationofrefriger-
Ants)
3 Terms and definitions, abbreviations and symbols
3.1 Terms and definitions
The following terms and definitions apply to this document.
3.1.1
Acute toxicity
Adverse health effects that may occur during a single release of short-term exposure during accidental release of refrigerant.
3.1.2
Acute toxicity exposure limit acute-toxicityexposurelimit; ATEL
The maximum recommended refrigerant concentration that reduces the risk of acute toxicity to humans in the event of refrigerant release, as determined by this standard.
3.1.3
Anesthetic effect
The ability to perceive pain and other sensory stimuli is diminished.
3.1.4
Close to lethal concentration approximatelethalconcentration; ALC
It is lethal to a single experimental animal, but less than 50% of the animals tested in the LC50 test under the same conditions.
Animals are lethal refrigerant concentrations.
3.1.5
Azeotrope mixed refrigerant azeotrope
Consisting of two or more refrigerants, the equilibrium vapor phase and liquid phase composition are the same at a given pressure, but under other conditions
May be different mixed refrigerants.
3.1.6
Mixed refrigerant blend
A mixed refrigerant composed of two or more refrigerants.
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