Detail of GB 35373-2017

Introduction of GB 35373-2017

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. Clauses 4, 6, 7.1, 7.2 and 7.3 of this standard are compulsory while the rest are recommendatory. This standard is drafted in accordance with the rules given in the GB/T 1.1-2009. This standard was proposed by and under the jurisdiction of the Ministry of Public Security of the People's Republic of China. HFC fire extinguishing agents 1 Scope This standard specifies the terms and definitions, abbreviations, general requirements, test methods, inspection rules, packaging, marking, filling, transportation and storage of HFC fire extinguishing agents. This standard is applicable to HFC fire extinguishing agents. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 191-2008 Packaging—Pictorial marking for handling of goods GB/T 601 Chemical reagent—Preparations of reference titration solutions GB/T 603 Chemical reagent—Preparations of reagent solutions for use in test methods GB/T 3864 Industrial nitrogen GB 5749 Standards for drinking water quality GB/T 5907.1 Fire protection vocabulary—Part 1: General terms GB/T6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 7376 Determination of micro-amounts of water in industrial fluorinated alkane GB/T 9722-2006 Chemical reagent—General rules for the gas chromatography GB 14193 Rules for filling of liquefied gas cylinders GB 14922.1 Laboratory animal—Standards and monitoring for parasitology GB 14922.2 Laboratory animal—Microbiological standards and monitoring GB 14923 Laboratory animal—Genetic quality control of mammalian laboratory animals GB 14924.3 Laboratory animals—Nutrients for Equation feeds GB 14925 Laboratory animal—Requirements of environment and housing facilities GB 18614-2012 Fire extinguishing agent heptafluoropropane (HFC227ea) GB/T 20285-2006 Toxic classification of fire effluents hazard for materials GA 578-2005 Super fine powder fire extinguishing agent Administrative regulations for road transportation of dangerous goods (the Ministry of Transport of the People's Republic of China) 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 5907.1 and the following apply. 3.1.1 HFC fire extinguishing agent hydrocarbon fire extinguishing agent only containing hydrogen and fluorine atoms, expressed by HFCxyz or HFCxyzfa or HFCxyzea Note: HFC represents hydrofluorocarbons; x represents the number of carbon atoms minus 1; y represents the number of hydrogen atoms plus 1; z represents the number of fluorine atoms; f represents the substituent form of the intermediate carbon atom as -CH-; c represents the substituent form of the intermediate carbon atom as -CHF-; a represents the difference between the substituent of the two ends is the smallest and the most symmetric. 3.2 Abbreviations For the purposes of this document, the following abbreviations apply. LOAEL—the lowest concentration at which an adverse physiological or toxicological effect has been observed; NOAEL—the highest concentration at which no adverse toxicological or physiological effect has been observed; TANK—the horizontal steel tank used for the storage of fire-extinguishing agents 4 Requirements 4.1 General 4.1.1 The performance of HFC fire extinguishing agents shall meet the requirements of this standard. 4.1.2 The manufacturers shall declare the following information: a) Name and content of main component and its isome; b) LOAE and NOAEL values of products; c) Extinguishing concentration which shall not be greater than 7%. 4.2 Technical requirements 4.2.1 Physical and chemical properties HFC fire extinguishing agent shall comply with the specification shown in Table 1. Table 1 Physical and chemical properties of HFC fire extinguishing agent Item Technical index Purity (%) ≥99.6 Acidity (mg/kg) ≤3 Moisture content (mg/kg) ≤10 Non-volatile residue (%) ≤0.01 Suspended matter or sediment No turbidity or sediment Toxicity Anesthesia No symptom or characteristic of anesthesia Irritation No symptoms or characteristic of irritation 4.2.2 Fire extinguishing performance All flames are extinguished within 30 s after complete discharge. There shall be remaining fuels in tray and cans. 5 Test methods WARNING—Attention is drawn to the necessity for taking precautions to safeguard the health and safety of the personnel conducting the tests against the potential hazard may arise from the test. 5.1 General requirements Unless otherwise specified, the reagents and water used in this standard refer to analytical reagents (AR) and Grade 3 water specified in GB/T 6682-2008. Unless otherwise specified, the standard solutions used in the tests shall be prepared according to the requirements of GB/T 601 and GB/T 603. 5.2 Sampling 5.2.1 Treatment method of sampling steel cylinder The sampling steel cylinder shall be cleaned with water and appropriate solvent (e.g. ethanol or acetone) prior to first use. After washing, the cylinder shall be dried in an electric heating cabinet at 105°C to 110°C for 3 h~4 h. The cylinder shall be immediately vacuumized until the absolute pressure is no higher than 1.3 kPa and maintained at this pressure for 1 h to 2 h, Then close the valve for sampling. Prior to each subsequent sampling, the remaining HFC fire extinguishing agent samples in the cylinder shall be emptied and vacuumed for another 1h under the condition of 1.3 kPa, followed by filling of a small amount of HFC fire extinguishing agent to be taken, and vacuumed for another 1h under the condition of 1.3 kPa to keep the sampling cylinder clean and dry. 5.2.2 Sampling Connect the outlet valve of the cylinder of HFC fire extinguishing agent with a dry short stainless steel tube. Open the cylinder valve slightly to discharge the HFC agent. Flush the valve and the connecting pipe for 1 min, and then quickly and tightly connect the end of the connecting pipe to the sampling cylinder valve. Place the sampling cylinder on a scale (immersed in an ice salt bath if necessary), open the outlet valve of the HFC fire extinguishing agent cylinder and the valve of the sampling cylinder, and inject the HFC fire extinguishing agent into the sampling cylinder. Determine the weight of filled sample from the weight change indicated by the scale. After sampling, close the valve of the sampling cylinder, close the valve of HFC fire extinguishing agent cylinder, and dismantle the connecting pipe. 5.3 Purity 5.3.1 Equipment Gas chromatograph: equipped with flame ionization detector (FID). Under the chromatographic conditions specified in 6.3 of GB/T 9722-2006, it takes benzene as the sample, and the sensitivity of whole machine is calculated based on the detection limit D, which requires to be no greater than 5×10-10g/s. 5.3.2 Test conditions See Table 2 for the recommended chromatographic test conditions. Other chromatographic column and chromatographic operating conditions which can reach the same degree of separation may also be adopted. Table 2 Chromatographic test conditions Item Condition Item Condition Capillary column 30m×320μm Bonded silica-based porous-layer open tubular column Column temperature (°C) The initial temperature maintains at 30°C for 4 min. Raise the temperature from 30°C to 200°C at a heating rate of 10°C/min and maintain for 10 min Injection flow rate (mL/min) 2.0 Temperature of detector/ ℃ 300 Injection port /℃ Split / splitless Split ratio: 40:1 Injection volume (mL) 1.0 Injection port temperature/℃ 200 Compensation gas (Nitrogen, ≥99.995%) Flow rate (mL/min) 45 Hydrogen (≥ 99.995%) Flow rate/(mL/min) 40 Air (dried and purified by silica gel or molecular sieve) Flow rate (mL/min) 450 5.3.3 Test procedures 5.3.3.1 Start the gas chromatograph. Adjust the instrument so that the conditions of the instrument are stable and meet the requirements. 5.3.3.2 Connect the sampling cylinder with the sampling pipe, put the cylinder down and open the cylinder valve to exhaust the gas for 1s to 3s. Take liquid phase vaporization sample for sample injection analysis. 5.3.3.3 Calculate the purity of HFC fire extinguishing agent with area normalization method 5.3.4 Results The arithmetic average obtained from three parallel determination results shall be taken as the determination result, and the absolute difference between the results shall not be greater than 0.05%.

Contents of GB 35373-2017

Foreword II 1 Scope 2 Normative References 3 Terms, Definitions and Abbreviations 4 General Requirements 5 Test Methods 6 Inspection Rules 7 Packaging, Marking, Filling, Transportation and Storage