This standard specifies the requirements, testing and inspection rules for flammable gas dangerous goods. This standard applies to the inspection of hazardous properties of flammable gas dangerous goods. GB 19521.3-2004 Safety specification for inspection of hazardous properties of flammable gas dangerous goods GB19521.3-2004 Standard download decompression password: www.bzxz.net

TC5_13.300:55.020
National Standard of the People's Republic of China
CB19521.3——2004
Safety code for inspection of hazardous properties for dangerous goods ot flammable gas Issued on 2004-05-20
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on 2004-11-01
Chapter 4 and 5 of this standard are mandatory, and the rest are flexible. GB19521.3—2004
The degree of consistency between this standard and the United Nations Protocol on the Transport of Hazardous Goods (13th revised edition) is non-equivalent. Its relevant technical specifications are consistent with the above-mentioned model regulations. The format of this standard follows GI5/1::2000 with supplementary materials and modifications. This standard was proposed by the National Technical Committee for the Management of Dangerous Chemicals (SAC/C:25\11. The effective source of this standard is: National Quality Inspection and Quarantine Administration Dangerous Goods Central Laboratory. The participating drafting units of this standard are Tianyang Exit Inspection and Quarantine Bureau, Asia Dangerous Goods Association, Jiangnan University. The main drafters of this standard are: Wang Li, Li Ningtao, Gao Weiping, Jiang Dangfeng, Zhang Jiang, Ma Kailian. It is the first time to formulate:
1 Scope
Safety specification for inspection of hazardous properties of flammable gas dangerous goods This standard specifies the requirements, inspection and supervision regulations for hazardous goods. This standard is applicable to the hazardous properties of flammable gas dangerous goods. 2 Normative references
GH T9521.32004
The clauses in the following documents are the clauses of this standard with special reference. For any reference to this document, its revision (excluding errata) or revision period shall not be used for technical standards. However, the parties to the agreement on the standard are encouraged to study whether the latest versions of these documents can be agreed upon soon. For any undated referenced documents, its latest version shall apply to this standard.GH191 General rules for safety inspection of dangerous goods (1S) 101561996 United Nations relevant dangerous goods inspection book model regulations for gases and gaseous compounds with low combustion potential and oxidizing energy No. 13 edition! 3 Terms and definitions This standard shall apply to the following terms and definitions established in the United Nations Recommendation on the Transport of Contaminated Goods (13th edition) and the following technical definitions: flammable gas uasflammahleinair a gas that can ignite in air at low atmospheric pressure. 3.2 lower flammability limit in air a gas that can ignite in air at 20°C at low atmospheric pressure. 4 Requirements
The markings printed or affixed on the flammable packaging and the colored labels of dangerous goods shall be accurate and meet the requirements of GR1158.
5 Tests
5.1 General requirements for tests
5.1.1 The flammable components in the gas to be tested shall contain the amount of flammable components that may be encountered in the daily production process, and the water content shall not exceed 10%.
5.1.2 The compressed air in the test shall not contain any moisture. 5.1.3 Before the test, the gas shall be fully mixed and the composition of the mixed gas shall be accurately analyzed by a chromatograph or a single carrier gas analyzer. 5.1.4 The inflator tube shall be made of heat-resistant steel (5mm thick), with an inner diameter of at least 50mm and a length of at least 5 times the inner diameter. During the test, the inflator tube shall be kept clean to avoid contamination. 5.1.5 The reverse displacement and flow meter should be fully covered to protect the test personnel from possible explosion: 5.2 Test equipment and materials 5.2.1 Test equipment As shown in Figure 1. CU19521.3—2004 Spark hazard: Thermoelectric code: Control tube: Quality opening: Exhaust gas analysis, Brightness rise: Inlet gas analysis: Pressure relief door: Flow gas: Test gas injection.
5.2.2 Reaction tube
Figure 1 Test equipment diagram
There should be a tube on the top of the reaction tube that can cut off the discharge of gaseous compounds. One end of the reaction tube should be a column and designed with:) 1 point light for spark rate, about 50mm from the bottom of the tube! 5) Gas mixture inlet for test: c) There is a pressure valve at the bottom of the car;
d 2 thermocouples are installed on the side of the ignition system, and the other is installed on the top of the tube. The purpose is to easily detect the delay of the fire start. It is a safety device. In the event of an explosion, the risk of damage caused by the failure can be minimized. 5.2.3 Protective cover
The device should be placed in a recognizable metal container, and one side should have a high-strength transparent material. 5.2.4 Ignition system
The ignition system can also provide a spark plug (voltage 15V) with an electrode spacing of 5mr. 2
5. 2. 5 Test gas
GB 19521.3-2004
The test gas should be prepared to be the component of the combustion of the exhibit under the self-heating state. The test gas used in the standard should be as moderate as possible, that is, the test gas should contain the highest liquid concentration of flammable red in the normal manufacturing process. The test gas should be fully mixed to determine its accurate composition.
5.3 Test steps
Use a flow meter to control the gas flow rate, fully prepare the two gas mixture, and close the gas inlet at the same time. Open the reaction port before ignition to make the pressure of the gas mixture equal to atmospheric pressure. Note: In addition to ensuring that the test vehicle is not ignited by the combustion gas before the test, the test can be carried out at a safe level. After the test, the flow meter will be easily ignited at a depth of 100 m/s. In the non-deep test, the following types of tests may occur: 9) The test gas mixture is not properly mixed with the test gas at this concentration in the air. The test process is repeated at a higher temperature. b) Partial combustion: The spark plug burns around the spark plug and then burns. This phenomenon is close to the flammable limit. Repeat the test at least once.
The flame rises slowly in the tube at a speed of 10 m/s to 50 m/s) The flame starts to rise very quickly in the tube. 5.4 Category
5.4.1 Test determination
5.4.1.1 In (a), if the gas is not flammable, the gas is determined to be non-flammable. 5.4.1.2 In 5.3(5), if a spark rises once in the repeated test, it can be considered that the flammability is limited, that is, the gas is completely flammable. 5.4.1.3 In 5.3(e), the phenomenon can be considered as flammability limit, that is, the gas is completely flammable. 5.4.1.4 In 5.3(d), if the phenomenon occurs, the gas can be considered to be flammable. 5.4.2 Calculation determination
5.4.2.1 Pure gas
The lower limit values ​​of some flammable gases have been obtained (see Appendix A of 130101561). These values ​​are obtained using test equipment similar to that described in 5.2. 5.4.2.2 The gas composition of a gas mixture containing a plurality of flammable gases and n kinds of inert gases can be expressed by the formula (A,F): -A+A,F - A+4,F, +B.L, +AB,I, +A+H,1 * In the formula:
the first, the distribution of flammable gas:
the first inert gas fraction;
F - represents the first flammable gas;
I - represents the first inert gas;
- represents the amount of flammable gas;
—— represents the amount of inert gas.
The ambient gas or the fraction in the lubricant is given in Table 1. The value is converted into the fraction of the oxygen component according to the proportion of all ambient gas components. The conversion step is: A,F, +AI A,F, +AA,F.+(R:E+AK.B, I AK,B,)N? In the formula:
, one is the number of the corresponding component coefficient of the gas. The sum of all gas components is equal to 1, then the composition expression becomes formula (3): EA.P+SKB.N,)A.-2KB.
CB19521,3-2004
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A, is the same amount of the gas,
The expansion T of the gas in air is not burned. See TS001.: 199 catties 1..1. If the following formula (4) is satisfied, the gas mixture shall be classified as flammable:
The inert gas is equivalent to the specific exchange system K, Ne
Society, for non-inert gases, its chemical test also contains 3 maximum boundaries, up to the use of the system failure, -1.5, SF
5. 4. 3 Contains one or more end gases, one or more essential gases, and one or more inert gases.
Note: The gas mixture containing the flammable and oxidizing gases is prepared at low pressure and under controlled conditions: the flammability limit can change with the change of temperature and atmospheric pressure. This safety specification does not provide information on the properties of this gas mixture preparation. Therefore, it is necessary to use other data for accurate analysis. 5.4.3.1 The oxidizing property of the decontaminated gas shall be calculated according to Article 5.3 of ISO101C156:1996. 5.4.3.2 The oxidizing property of the gas mixture shall be calculated according to Article 4.6.2.2 of ISO10156:1996. Inspection rules
6.1 Inspection items
Inspect items according to the requirements of Section 4 and Section 5 of the technical standard. 6.2 Inspection of parts
Hazardous characteristic inspection shall be conducted in the following situations: a) When a new product is not produced or the whole product is changed wwW.bzxz.Net
6) After formal production, the material and process have changed significantly, which may affect the performance of the single product; c) When normal production is stopped, once a year; d) After the product has been in production for a long time, when the "test result" is significantly different from the previous hazardous characteristic inspection result when resuming production, c) The national quality supervision agency shall conduct hazardous characteristic inspection according to the test result. 6.3 Judgment rules
Carry out trial and evaluation according to the description of Section 5.2 to Section 3.1, and judge the hazardous characteristic of the different models based on the test and evaluation results:
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