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GB/T 44262-2024 PDF English


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GB/T 44262-2024: PDF in English (GBT 44262-2024)

GB/T 44262-2024 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.010 CCS F 19 Technical Requirements for Sampling of Hydrogen for Proton Exchange Membrane Fuel Cell Vehicles ISSUED ON: JULY 24, 2024 IMPLEMENTED ON: NOVEMBER 1, 2024 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of Contents Foreword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Terms and Definitions ... 5 4 Equipment ... 5 5 Pre-sampling Preparation ... 8 6 Sampling Steps ... 8 7 Sampling Record ... 12 Appendix A (informative) Sampling Record of Hydrogen for Proton Exchange Membrane Fuel Cell Vehicles ... 13 Bibliography ... 14 Technical Requirements for Sampling of Hydrogen for Proton Exchange Membrane Fuel Cell Vehicles WARNING: hydrogen is a flammable and explosive gas. This document does not address all safety issues related to its application. Before adopting this document, the user is responsible for formulating corresponding safety and protection measures, clarifying its limited scope of application, and ensuring the compliance with the provisions of relevant national laws, regulations and mandatory national standards. 1 Scope This document specifies the requirements for hydrogen sampling equipment, pre-sampling preparation, sampling steps and sampling record for proton exchange membrane fuel cell vehicles. This document is applicable to the sampling of hydrogen in hydrogen refueling stations with a pressure level not greater than 70 MPa. The sampling of hydrogen for proton exchange membrane fuel cells in the production, storage and transportation sites may take this as a reference. 2 Normative References The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 1226 General Pressure Gauge GB/T 1227 Accurate Pressure Gauge GB/T 8979 Pure Nitrogen and High Purity Nitrogen and Ultra Pure Nitrogen GB/T 12244 General Requirements for Pressure Reducing Valves GB 12358 Gas Monitors and Alarms for Workplace - General Technical Requirements GB/T 21465 Terminology for Valves GB/T 24499 Technology Glossary for Gaseous Hydrogen, Hydrogen Energy and Hydrogen Energy System GB/T 26779 Hydrogen Fuel Cell Electric Vehicle Refueling Receptacle GB/T 29729 Essential Requirements for the Safety of Hydrogen Systems GB/T 37244 Fuel Specification for Proton Exchange Membrane Fuel Cell Vehicles - Hydrogen GB/T 43306 Gas Analysis - Sampling Guidelines GB/T 43674 General Requirements of Hydrogen Fueling Stations GB 50156 Technical Standard of Fueling Station GB 50516 Technical Code for Hydrogen Fueling Station (version 2021) 3 Terms and Definitions The terms and definitions defined in GB/T 21465, GB/T 24499 and GB/T 43306 are applicable to this document. 4 Equipment 4.1 Hydrogen Sampling Device 4.1.1 General requirements The hydrogen sampling device shall satisfy the following requirements: ---The design of the hydrogen sampling device shall comply with the relevant provisions of GB 50156, GB 50516 and GB/T 43674; ---Materials in contact with hydrogen in the hydrogen sampling device shall comply with the relevant provisions of GB/T 29279; ---The hydrogen sampling device shall not contaminate the sample, and the materials in contact with hydrogen in the sampling device shall not adsorb the collected components. The overall performance shall be subject to a quality assessment in accordance with GB/T 43306. 4.1.2 Basic composition The hydrogen sampling device should be equipped with sampling source port, stop valve, pressure gauge, pressure reducing valve, inlet valve, outlet valve, sampling gas cylinder, bypass valve, safety valve, check valve, venting component and grounding component. It is advisable to choose valves with a small dead volume. The schematic diagram of the hydrogen sampling device is shown in Figure 1. Hydrogen sampling devices with the same functions as shown in the Figure may also adopt this Figure. Each sample source port of the hydrogen sampling device shall be equipped with a separate stop valve, and the nominal pressure of the stop valve shall be greater than the maximum allowable working pressure of the sample source port. 4.1.3.3 Pressure gauge The pressure gauge shall comply with the provisions of GB/T 1226 or GB/T 1227. The measuring range of the sample source pressure gauge should be 1.5 ~ 3.0 times the maximum allowable working pressure of the sample source port, and the measuring range of the output pressure gauge should be 1.5 ~ 3.0 times the design sampling pressure. 4.1.3.4 Pressure reducing valve The pressure reducing valve shall comply with the provisions of GB/T 12244 and GB/T 43306. Its material should be stainless steel and subject to inert treatment, and the dead volume should be as small as possible. The nominal pressure shall be greater than the maximum allowable working pressure of the sample source port. The outlet pressure shall be adjustable to the design sampling pressure. 4.1.3.5 Inlet valve, outlet valve and bypass valve The inlet valve, outlet valve and bypass valve shall be valves that are easy to open and close (for example, ball valves), and the nominal pressure shall be greater than the set pressure of the safety valve. 4.1.3.6 Sampling gas cylinder The sampling gas cylinder shall comply with the relevant provisions of special equipment and be exclusively used. Its nominal working pressure shall not be lower than the maximum design sampling pressure. The sampling gas cylinder should be a double-valve type. For sampling gas cylinder used for adsorbent impurity detection, the inner wall, inlet valve and outlet valve of the gas cylinder shall be subject to the inert treatment. 4.1.3.7 Safety valve The safety valve should be a full-open safety valve, and the set pressure should be 1.05 ~ 1.15 times the maximum design sampling pressure of the hydrogen sampling device. 4.1.3.8 Check valve The opening pressure of the check valve should be greater than 69 kPa. 4.1.3.9 Venting component A venting component shall be used to vent hydrogen generated during the sampling process. The venting component shall include a separate venting pipe and connecting hose. Its design and layout shall comply with the provisions of GB 50156, GB 50516 and GB/T 43674. The design pressure shall be greater than the set pressure of the safety valve. 4.1.3.10 Grounding component The grounding component shall comply with the provisions of GB 50156, GB 50516 and GB/T 43674. 4.1.3.11 Connecting pipelines The nominal pressure of the pipeline at the front of the pressure reducing valve shall be greater than the maximum allowable working pressure of the sample source port, and the nominal pressure of the remaining pipelines shall be greater than the set pressure of the safety valve. The material of the pipelines should be stainless steel and subject to the inert treatment. The connection mode of the pipelines should be metal ferrule connection, metal gasket connection (VCR connection) or welding. 4.2 Hydrogen Leak Detector The hydrogen leak detector is used to detect leaks in the sampling device and shall comply with the provisions of GB 12358. 5 Pre-sampling Preparation 5.1 Before sampling, in accordance with the demands for sample testing, determine the sampling volume, sampling pressure and specifications of the sampling gas cylinder. 5.2 Before sampling, the sampling gas cylinder shall be cleaned to remove air, moisture and other contaminants. When the hydrogen retained in the sampling gas cylinder complies with the provisions of GB/T 37244 and the pressure is not less than 0.2 MPa (gauge pressure), the sampling gas cylinder does not need to be cleaned. 5.3 Before sampling, nitrogen that complies with the provisions of high purity nitrogen in GB/T 8979 shall be used to blow the hydrogen sampling device, so as to remove air and moisture. During blowing, the sampling device shall not be equipped with a sampling gas cylinder. After blowing is completed, all valves of the sampling device shall be closed to prevent air from entering. Water, isopropyl alcohol or other solvents shall not be used to clean the hydrogen sampling device. NOTE: the residual nitrogen here can be easily removed when the system is blown in accordance with 6.3 and will not affect subsequent sample analysis. 6 Sampling Steps NOTE: when the sampling device is equipped with multiple sample source ports and stop valves, the stop valve described in this Chapter refers to the stop valve corresponding to the sample source port to be sampled, and the stop valves corresponding to the other sample source ports are closed throughout the process. accessories of the hydrogen sampling device are replaced or re-connected, leak detection shall be performed again. 6.3 System Blowing 6.3.1 General rules The system blowing shall be carried out in accordance with 6.3.2 or 6.3.3. When sampling the hydrogen refueling nozzle outlet, it shall be carried out in accordance with 6.3.2. 6.3.2 Continuous blowing displacement method The continuous blowing displacement method is carried out in accordance with the following steps: a) When confirming that the stop valve A is closed, open the sample source hydrogen valve; b) Slowly open the stop valve A and adjust the pressure reducing valve B to the sampling pressure; c) Successively open the inlet valve D, sampling gas cylinder inlet valve E, sampling gas cylinder outlet valve F and outlet valve G to allow the blown hydrogen to flow through the sampling device and sampling gas cylinder. During operation, the pressure and temperature of the sampling gas cylinder shall be observed. When the gas cylinder pressure exceeds the sampling pressure or the gas cylinder temperature is significantly higher than the ambient temperature, the sample source hydrogen valve shall be immediately closed. The amount of gas blown shall be not less than 600 times the total volume of the sampling gas cylinder and the sampling device pipeline. 6.3.3 Inflate-vent displacement method The inflate-vent displacement method is carried out in accordance with the following steps: a) Confirm that the stop valve A is closed and open the sample source hydrogen valve; b) Slowly open the stop valve A and adjust the pressure reducing valve B to the sampling pressure; c) Successively open the inlet valve D and sampling gas cylinder inlet valve E to allow hydrogen to flow into the sampling gas cylinder; d) After the output pressure gauge is stable, close the inlet valve D, open the sampling gas cylinder outlet valve F and outlet valve G, vent the hydrogen in the sampling gas cylinder and pipeline, and close the outlet valve G; e) Open the inlet valve D. After the output pressure gauge is stable, close the inlet valve D, open the outlet valve G, vent the hydrogen in the sampling gas cylinder and pipeline, and then, close the outlet valve G; f) When the sampling pressure is less than or equal to 3 MPa, repeat step e) for no less than 9 times; when the sampling pressure is greater than 3 MPa, repeat step e) for no less than 6 times. During operation, the pressure and temperature of the sampling gas cylinder shall be observed. When the gas cylinder pressure exceeds the sampling pressure or the gas cylinder temperature is significantly higher than the ambient temperature, the sample source hydrogen valve shall be immediately closed. 6.4 Sample Collection 6.4.1 After completing the system blowing in accordance with 6.3.2, follow the following steps to collect samples: a) Close the sampling gas cylinder outlet valve F; b) After the output pressure gauge is stable, close the sampling gas cylinder inlet valve E; c) Close the sample source hydrogen valve and the stop valve A; d) Open the bypass valve C to discharge the remaining hydrogen in the hydrogen sampling device; e) Close the inlet valve D and outlet valve G, and remove the sampling gas cylinder; f) Use a hydrogen leak detector to detect leaks in the removed sampling gas cylinder. During operation, the pressure and temperature of the sampling gas cylinder shall be observed. When the gas cylinder pressure exceeds the sampling pressure or the gas cylinder temperature is significantly higher than the ambient temperature, the sample source hydrogen valve shall be immediately closed. 6.4.2 After completing the system blowing in accordance with 6.3.3, follow the following steps to collect samples: a) Open the inlet valve D; b) After the output pressure gauge is stable, close the sampling gas cylinder outlet valve F and the sampling gas cylinder inlet valve E; c) Close the sample source hydrogen valve and the stop valve A; d) Open the bypass valve C to discharge the remaining hydrogen in the hydrogen sampling device; ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.