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Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 12137-2025: Methods for leakage test of gas cylinders Status: Valid GB/T 12137: Historical versions
Basic dataStandard ID: GB/T 12137-2025 (GB/T12137-2025)Description (Translated English): Methods for leakage test of gas cylinders Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J74 Classification of International Standard: 23.020.30 Word Count Estimation: 21,267 Date of Issue: 2025-08-29 Date of Implementation: 2026-03-01 Older Standard (superseded by this standard): GB/T 12137-2015 Issuing agency(ies): State Administration for Market Regulation; Standardization Administration of China GB/T 12137-2025: Methods for leakage test of gas cylinders---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12137-2025ICS 23.020.30 CCSJ74 National Standards of the People's Republic of China Replaces GB/T 12137-2015 Gas cylinder air tightness test method Published on 2025-08-29 Implemented on 2026-03-01 State Administration for Market Regulation The State Administration for Standardization issued a statement. Table of ContentsPreface III 1.Scope 1 2 Normative References 1 3.Terms and Definitions 1 4.Principle 2 5.Test conditions 2 6.Test medium 2 7.Instruments and Equipment 3 8 test bottles 4 9.Test Methods 4 10 Post-experiment processing 11 11 Experimental Records 11 12.Precautions during the experiment Appendix A (Normative) Hydrogen-Helium Leakage Rate Conversion Method 13 Appendix B (Informative) Pressure Proportioning Method for Preparing Helium-Nitrogen Mixtures 16ForewordThis 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 replaces GB/T 12137-2015 "Test Method for Air Tightness of Gas Cylinders". Compared with GB/T 12137-2015, the only changes are structural adjustments. Aside from editorial changes, the main technical changes are as follows. a) The scope of application has been changed (see Chapter 1, Chapter 1 of the.2015 edition); b) Added some terms and their definitions, such as "test bottle" (see 3.1, 3.4~3.11); c) A "Principle" section has been added (see Chapter 4); d) The "Test Conditions" have been changed (see Chapter 5, 6.2 of the.2015 edition); e) The requirements for "Test Media" have been revised to include requirements for test media in the helium mass spectrometry leak detection method (see Chapter 6, 6.1 of the.2015 edition); f) The regulations for "Instruments and Equipment" have been amended, adding requirements for instruments and equipment for helium mass spectrometry leak detection (see Chapter 7, 4.1 of the.2015 edition). 4.2, 4.3); g) The specifications for the “test bottle” have been changed (see Chapter 8, Chapter 5 of the.2015 edition); h) The provisions regarding the selection of test methods have been amended (see 9.1, 6.1 of the.2015 edition); i) The "test procedures" and related requirements during the test process for the immersion method and the coating method have been added (see 9.2 and 9.3); j) A helium mass spectrometry leak detection method has been added (see 9.4); k) Added "Post-Experiment Processing" (see Chapter 10); l) The requirements for test records have been changed (see Chapter 11, Chapter 7 of the.2015 edition); m) Added "Precautions during the experiment" (see Chapter 12); n) A method for converting hydrogen-helium leakage rates has been added (see Appendix A). 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 Gas Cylinders (SAC/TC31). This document was drafted by. Dalian Boiler and Pressure Vessel Inspection and Testing Institute Co., Ltd., and Toyota Motor (China) Investment Co., Ltd. Sinoma Science & Technology (Suzhou) Co., Ltd., Dalian University of Technology, Anhui Daxin Vacuum Technology Co., Ltd., Shijiazhuang Anruike Gas Machinery Co., Ltd. Company, Zhejiang University, Beijing Kotech Technology Co., Ltd., China Ocean Engineering Research Institute (Qingdao), Beijing Tianhai Hydrogen Energy Equipment Co., Ltd. Company, China Special Equipment Inspection and Research Institute, Faurecia Slinda Safety Technology (Shenyang) Co., Ltd., Shenyang Oushdun New Material Technology Co., Ltd. The company, Jiangsu Zhonghong Machinery Manufacturing Co., Ltd., and Zhejiang Jindun Gas Equipment Intelligent Manufacturing Co., Ltd. The main drafters of this document are. Dai Xingtao, Jiang Guoyong, Wang Yao, Yang Minggao, Song Xuesi, Liu Peiqi, Zhang Chuansheng, Qi Hubin, Wang Hao, and Zhao Liang. Zhang Guo, Yue Zengzhu, Luo Hui, Ji Zengxiang, Yang Shujun, Cai Lizhu, Pan Jianfei, Tao Siwei, Gao Yongzheng, Wei Jie, Ma Xiakang. This document was first published in 1989, revised for the first time in.2002, revised for the second time in.2015, and this is the third revision. Gas cylinder air tightness test method 1.Scope This document specifies the principles, test conditions, test media, instruments and equipment, test bottles, test methods, and post-test procedures for gas cylinder airtightness testing. Processing and testing records. This document applies to the airtightness test of gas cylinders with a nominal working pressure not exceeding 70 MPa (gauge pressure).2 Normative referencesThe 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 12604.7 Nondestructive Testing Terminology - Leak Detection GB/T 13005 Gas Cylinder Terminology GB/T 13979 Mass Spectrometer Leak Detector GB/T 15823 Non-destructive testing method for helium leak detection GB/T 18443.2 Test methods for performance of vacuum-insulated cryogenic equipment - Part 2.Vacuum degree measurement NB/T 47013.8 Non-destructive testing of pressure equipment - Part 8.Leakage detection 3.Terms and Definitions The terms and definitions defined in GB/T 13005 and GB/T 12604.7, as well as the following terms and definitions, apply to this document. 3.1 Test bottle testing cylinder Gas cylinders that are to be tested or are being tested. 3.2 Water-immersion test A test method that involves immersing a test bottle filled with gas at a specified pressure in a water bath to check its airtightness. Note. The immersion method is applicable to the overall airtightness test of the test bottle. 3.3 Soapbubble test A test method that involves applying a test solution to the area to be tested on a test bottle filled with gas at a specified pressure to check the airtightness of that area. Note. The liquid coating method is applicable to gas cylinders at locations such as the threaded connection between the test bottle and the valve, the valve stem, the valve outlet, safety relief devices, or welded joints of the gas cylinder. Air tightness test. 3.4 A method for detecting leaks of trace helium gas in a test bottle filled with gas at a specified pressure using a helium mass spectrometer leak detector. 3.5 The test vial, filled with gas at a specified pressure, is placed in a test chamber of known volume. Within a specified time, the vial is tested using a helium mass spectrometer leak detector. A method for detecting leaks in bottles by using trace amounts of tracer helium. 3.6 vacuum chamber test The test vial filled with gas at a specified pressure is placed in a test chamber of known volume. The system is in a vacuum state and reaches a settling time. Then, a method for detecting leaks of trace tracer helium gas in the test bottle was used, employing a helium mass spectrometer leak detector. 3.7 Sniffing test A leak detection method that involves pressurizing the test bottle with a gas containing tracer helium and measuring a trace amount of tracer helium through a suction gun probe. 3.8 Pressure measuring instruments used to verify the accuracy of the working pressure readings. 3.9 working pressure gauge Pressure measuring instruments used to display and record the pressure of the test bottle. Note. Working pressure gauges include pressure gauges and pressure transmitters (or digital pressure gauges that can output pressure signals). 3.10 Capillary Standard Leak It has an independent helium tank with a pressure of not less than 0.1 MPa and allows tracer helium to pass through a leak in a locally thinned tube. Note. The helium leakage rate of the capillary type standard leak ranges from 1×10-6 Pa·m3/s to 1×10-4 Pa·m3/s. 3.11 A permeable leak made of melted and calibrated glass or quartz. Note. The helium leakage rate of the standard permeation type leak ranges from 1×10⁻⁹ Pa·m³/s to 1×10⁻⁷ Pa·m³/s. 4.Principles Using a specified gas as the pressurizing medium, the pressure inside the test bottle is increased slowly and uniformly to its airtightness test pressure, and maintained at the specified pressure for a specified time. During this period, different test methods were used to determine the leakage of the test bottle under the airtightness test pressure. 5.Test conditions 5.1 The ambient temperature of the test environment should be greater than 5℃ and not greater than the maximum allowable operating temperature of the test bottle. 5.2 According to the test requirements of different gas cylinders, the test cylinder should be pressurized slowly and uniformly to the airtightness test pressure. 6.Test medium 6.1 When using the immersion method or the coating method, the test medium shall meet the following requirements. a) The test medium shall be dry, clean air, nitrogen, or other gas compatible with the properties of the test bottle and the gas it contains, and shall be non-toxic and harmless to humans. Corrosive non-flammable gas; b) For test bottles containing non-flammable, non-toxic, and non-corrosive gases, the gas contained therein can be directly selected as the test medium; c) For test bottles that have previously contained combustible gas, if the volume concentration of combustible gas in the bottle is less than 0.4%, air can be used as the test medium. If the gas is of poor quality, otherwise, nitrogen or an inert gas shall be used as the test medium; d) For test bottles that have previously contained toxic or corrosive media, nitrogen or an inert gas should be used as the test medium; ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 12137-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 12137-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. 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