This standard is published for the first time. This standard specifies the determination of the flammability of industrial chemical gases and is applicable to the determination of the flammability of gas chemical products mixed with air at ambient pressure. This standard is equivalent to NF20-041:1985 "Determination of the flammability of industrial chemical products" (French version). GB/T 21847-2008 Determination of the flammability of industrial chemical products GB/T21847-2008 Standard download decompression password: www.bzxz.net
This standard is published for the first time. This standard specifies the determination of the flammability of industrial chemical gases and is applicable to the determination of the flammability of gas chemical products mixed with air at ambient pressure. This standard is equivalent to NF20-041:1985 "Determination of the flammability of industrial chemical products" (French version). This standard is equivalent to NFT20?041:1985 "Determination of the flammability of industrial chemical products" (French version).
This standard is equivalent to NFT20?041:1985 "Determination of the flammability of industrial chemical products" (French version).
This standard is proposed and managed by the National Technical Committee for Standardization of Dangerous Chemicals Management (SAC/TC251). The
responsible drafting unit of this standard: Tianjin Entry-Exit Inspection and Quarantine Bureau.
Participating drafting units of this standard: Jiangsu Entry-Exit Inspection and Quarantine Bureau, China Institute of Inspection and Quarantine.
Main drafters of this standard: Yu Yanjun, Feng Zhixie, Xu Yan, Xiong Zhongqiang, Zhou Xin, Li Jing.
This standard is published for the first time.

ICS13.3Co
National Standard of the People's Republic of China
GB/T21847—2008
Chemical products for industrial use-Determinalion of inflammability of gases2008-05-12issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
2008-09-01implemented
GB/T21847-2C08
This standard is equivalent to NFT20-0411985% Standard for Flammability of Industrial Chemical Gases (French version)
This standard was proposed by the National Technical Committee for Standardization of Dangerous Chemicals Management and Transportation (SAC/TC251). 1. The responsible unit for the issuance of this standard: Tianjin Exit-Entry Inspection and Quarantine Bureau, and the participating units of this standard: Jiangsu Exit-Entry Inspection and Quarantine Bureau, China Inspection and Quarantine Scientific Research Institute. The main drafters of this standard are Yu Yanjun, Ma Zhimeng, Xu Yan, Xiong Zhongqiang, Zhou Xin, and Li Jing. This standard is the first to be issued.
GB/T218472008
NFT Introduction
This standard was approved by the General Director of the French Standardization Association on August 5, 1985 and took effect on September 5, 1985. Before the publication of this standard, there was no relevant national standard in the world, but it is consistent with the methods described in Directive A11 of the Committee 84/449/CEE.
This standard is for those who are engaged in the physical and chemical properties analysis of chemicals (industrial use). In this case, a technical file must be prepared to provide a new set of content, or to prepare it in accordance with Article 82-950, taking into account the provisions of Article 79/83:/CEE on the sixth revision of Article 67/548/CF
on the relevant provisions of the stored substances.
Mix with air as usual, and use electric spark to transport the mixed gas to observe whether the mixed gas is flammable.
International Technical Vocabulary:
Industrial Products
Test.
Chemical Composition
Determination of Gas Flammability
This standard is applicable to the determination of the flammability of gas chemical products after mixing with air at ambient pressure. 2 Terms and Definitions
The following terms and definitions apply to this standard. 2.1
Gas Flammability
Inflar
The range in which a gas does not spread when it is in contact with air.
Sof gas
Gradually increase the gas concentration in the airbZxz.net
Reagents and materials
Test tube
300mm
50mm
. The test tube has a support
4.2 Ignition source
The ignition source is a 10
electric spark from a high
rectifier, which is used as the ignition
4.3 Metering pump
Test steps
Mixed gas at room temperature and atmospheric pressure
.
Increase
the maximum concentration ignition
with a distance of 3m
observe whether there is flame spread
GB/T 21847-2008
the ignition electrodes are fixed in the test tube 60mm with a standard interval C.5 s at a rate of 3COW
the maximum output voltage is
the input voltage is recorded by the meter (4.3) in the gas test tube (4.1). In the gas test tube (4.1), the test gas and air at natural temperature
ignite in the mixed gas. Observe the generation and spread of fire in the mixed gas. Repeat the test for each 1% increase in gas concentration until the flame described in the above test is obtained, and then continue to increase the gas concentration until the mixed gas no longer ignites. 6 Test results
During the test, the flammability of the gas sample with gradually increasing concentration after mixing with air changes in the chamber, and the flame is generated, and the gas concentration is measured in L/m.
Test report
The test report should include the following contents:
) Sample information (impurities, etc.);
Reference for usage method:
Instrument used (volume, etc.),
GB/T 218477008
-Test conditions;
Test results:
-The concentration of the mixed gas in the case of flammability and non-flammability. If the gas is non-flammable, it should be detailed. The gas volume fraction in the test is increased from C% to 100% with an increase of 1% each time;
Take into account all special circumstances that occur during the test, and take into account all operations that are not expected in the current guidelines or all arbitrary operations. 2
References
GB/T 21847--2008
Regulation No. 82-903 of January 21, 1982, amending Regulation No. 77771 (J.0. October 22, 1982); Council Directive 67/548/CEE of June 27, 1967 (JOCE No. L196 of August 16, 1967, page 1); Council Directive 79/831/CEE of September 18, 1979 (JOCE No. L259 of October 75, 1979, page 10); Commission Regulation 84/449/CEE of April 256, 1989 (JOCE No. L251 of August 1984, page 251);
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