GB/T 7445-1995 Hydrogen, High Purity Hydrogen and Ultra-high Purity Hydrogen
1 Scope
This standard specifies the requirements, sampling and chemical and physical testing of hydrogen, high purity hydrogen, and ultra-high purity hydrogen.
2 Normative References
The following documents are essential to the application of this Standard. For dated references, only the cited edition applies to this Standard. For undated references, the latest edition (including any amendment) applies.
GB/T 1113 Cleanliness of Furniture
GB/T 1216 Methods of Removing Surface Contamination by Solvents
GB/T 1884 Quantitative Analysis of Metal Impurities by Atomic Absorption Spectrophotometry
GB/T 2828 Sampling Techniques for Inspection
GB/T 4343 Methods for the Estimation of Permanganate Value of Petroleum Products
GB 6181 Definition and Symbol for the Calcium Index
GB/T 6682 Analytical Methods for Liquid Chromatography
GB/T 6888 Methods for Determining the Freezing Point of Petroleum Products
GB/T 7745 Gas Chromatography and Mass Spectrometric Detection Method of Heavy Metal Impurities in Aqueous H2O2 Solutions
GB/T 7746 Gas Chromatographic Method With a Thermal Conductivity Detector for the Analysis of Trace Water Components
GB/T 7793 Methods of Testing Volatile Organic Compounds
SH/T 0400 Methods of Testing the Quality of Water in Refinery Process Streams
SH/T 0435 Pesticide Residues Analysis Methodology
SH/T 0507 Metal Impurities Analysis Methodology
SH/T 0755 Sampling and Testing of Oils in Natural Gas Streams
SH/T 0760 Properties and Testing of Oils in Natural Gas Streams
SH/T 0793 Microbial Control Methodology
SH/T 0909 Environmental Quality Standards of Oils in Natural Gas Streams
SH/T0956 Determination of Free Hydrogen in natural gas
3 Requirements
3.1 Purity
3.1.1 Hydrogen
The mass fraction of each composition in hydrogen should comply with the Table 1.
Table 1 Composition of hydrogen
Composition Mass fraction, %
Carbon dioxide ≤0.5
Hydrogen sulfide ≤0.2
C1-C4 hydrocarbons ≤0.4
Moisture, g/m3 ≤120
Combustible impurities, g/m3 ≤20
Residual oxygen, g/m3 ≤10
Particulate pollutants, g/m3 ≤0.2
Total Halogens (fluorine, chlorine, bromine, iodine); mg/m3 ≤0.04
Total metal ≤mg/m3 0.1
Total organic compounds (TOC) ≤mg/m3 0.2
Aldehydes and Ketones ≤mg/m3 0.1
3.1.2 Ultra-high purity hydrogen
The mass fraction of each composition in ultra-high purity hydrogen should comply with the Table 2.
Table 2 Composition of ultra-high purity hydrogen
Composition Mass fraction, %
Carbon dioxide ≤0.01
Hydrogen sulfide ≤ 0.005
C1-C4 hydrocarbons ≤ 0.03
Moisture, g/m3 ≤20
Combustible impurities, g/m3 ≤2
Residual oxygen, g/m3 ≤1
Particulate pollutants, g/m3 ≤0.02
Total halogens (fluorine, chlorine, bromine, iodine); mg/m3 ≤0.01
Total metal mg/m3 ≤0.01
Total organic compounds (TOC) mg/m3 ≤0.01
Aldehydes and Ketones mg/m3 ≤0.005
3.2 General characters
It should comply with the requirements in Table 3.
Table 3 General characters
Characteristic Requirement
Smell ≤ Unpleasant smell
Density ≤ 0.832 g/cm3
Appearance ≤ Colourless and transparent
pour point ≤ -253℃/ -425℉
Flash point ≤ -253℃/-425℉
Corrosion Dryness isnt corroded
Hygroscopicity Not hygroscopic
Colour ≤ Colourless
3.3 Sampling
3.3.1 Sampling procedures should comply with GB/T 2828.
3.3.2 The size of sample should be no fewer than 25g to permit a complete and accurate analysis.
3.4 Analysis and test methods
Selection of analysis and test methods should comply with the requirements of GB/T 2828.
4 Transport, Storage and Packing
4.1 Transport
During transportation and storage, hydrogen containers intermittently should be sampled for inspection, and the tank car should be thoroughly cleaned and waxed.
4.2 Storage
Hydrogen should be stored in sealed containers on clean, dry, and level ground, and away from corrosive materials, petrol and other members of the petroleum family, and combustible materials.
4.3 Packing
Hydrogen should be packed in pressure resistant drums that are airtight, and if applicable, refrigeration systems should be installed. The tanks should be made of therapeutic steel and be examined, tested and insulated as required.
5 Marking, Labeling and Document
Not applicable.
6 Quality Certificate
6.1 The manufacturer shall provide an accurate and complete quality report, and the report should include the following information:
a) Brand name;
b) Lot number;
c) Origins;
d) Specifications;
e) Date of manufacture;
f) Total mass;
g) Results of all tests.
6.2 The quality report should be in accordance with the relevant provisions of this standard.
