GB/T 8979-2008
Replaces GB/T 8979-1996, GB/T 8980-1996
Pure nitrogen and high purity nitrogen and ultra pure nitrogen
1 Scope
This standard specifies the technical requirements, inspection methods, as well as packaging, marking, storage, transport and safety warnings for pure nitrogen, high purity nitrogen, and ultra pure nitrogen products.
This standard is applicable to gaseous or liquid pure nitrogen, high purity nitrogen, or ultra pure nitrogen obtained by air separation or purification, which is primarily used as shielding gas, purge gas, reaction gas, etc.
Molecular formula: N2
Relative molecular mass: 28.0134 (as per the relative atomic mass in 2005).
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
GB/T 3864-2008 Industrial nitrogen
GB/T 5832.1 Determination of moisture in gases - Part 1: Electrolytic method
GB/T 5832.2 Determination of trace water in the gases - Dew point method
GB/T 6285 Determination of trace oxygen in gases - Electrochemical method
GB/T 8981 Determination of trace hydrogen in gases - Gas chromatographic method
GB/T 8984.1 Determination of carbon monoxide, carbon dioxide and hydrocarbon in the gases - Part 1: Determination of carbon monoxide, carbon dioxide and methane in the gases
GB/T 14605 Determination of trace argon, nitrogen and krypton in oxygen - Gas chromatographic method
HG/T 2686 Determination of trace hydrogen, oxygen, methane, and carbon monoxide in inert gases - Gas chromatography with zirconia detector
3 Requirements
The technical requirements for pure nitrogen, high purity nitrogen, and ultra pure nitrogen shall comply with those specified in Table 1.
Table 1 Technical requirements for pure nitrogen, high purity nitrogen, and ultra pure nitrogen
Item Index
Pure nitrogen High purity nitrogen Ultra pure nitrogen
Nitrogen (N2) purity (volume fraction)/10-2 ≥ 99.99 99.999 99.9999
Oxygen (O2) content (volume fraction)/10-6 ≤ 50 3 0.1
Argon (Ar) content (volume fraction)/10-6 ≤ — — 2
Hydrogen (H2) content (volume fraction)/10-6 ≤ 15 1 0.1
Carbon monoxide (CO) content (volume fraction)/10-6 ≤ 5 1 0.1
Carbon dioxide (CO2) content (volume fraction)/10-6 ≤ 10 1 0.1
Methane (CH4) content (volume fraction)/10-6 ≤ 5 1 0.1
Moisture (H2O) content (volume fraction)/10-6 ≤ 15 3 0.5
Foreword i
1 Scope
2 Normative references
3 Requirements
4 Test methods
5 Packaging, marking, storage, transport and safety warnings
GB/T 8979-2008
Replaces GB/T 8979-1996, GB/T 8980-1996
Pure nitrogen and high purity nitrogen and ultra pure nitrogen
1 Scope
This standard specifies the technical requirements, inspection methods, as well as packaging, marking, storage, transport and safety warnings for pure nitrogen, high purity nitrogen, and ultra pure nitrogen products.
This standard is applicable to gaseous or liquid pure nitrogen, high purity nitrogen, or ultra pure nitrogen obtained by air separation or purification, which is primarily used as shielding gas, purge gas, reaction gas, etc.
Molecular formula: N2
Relative molecular mass: 28.0134 (as per the relative atomic mass in 2005).
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
GB/T 3864-2008 Industrial nitrogen
GB/T 5832.1 Determination of moisture in gases - Part 1: Electrolytic method
GB/T 5832.2 Determination of trace water in the gases - Dew point method
GB/T 6285 Determination of trace oxygen in gases - Electrochemical method
GB/T 8981 Determination of trace hydrogen in gases - Gas chromatographic method
GB/T 8984.1 Determination of carbon monoxide, carbon dioxide and hydrocarbon in the gases - Part 1: Determination of carbon monoxide, carbon dioxide and methane in the gases
GB/T 14605 Determination of trace argon, nitrogen and krypton in oxygen - Gas chromatographic method
HG/T 2686 Determination of trace hydrogen, oxygen, methane, and carbon monoxide in inert gases - Gas chromatography with zirconia detector
3 Requirements
The technical requirements for pure nitrogen, high purity nitrogen, and ultra pure nitrogen shall comply with those specified in Table 1.
Table 1 Technical requirements for pure nitrogen, high purity nitrogen, and ultra pure nitrogen
Item Index
Pure nitrogen High purity nitrogen Ultra pure nitrogen
Nitrogen (N2) purity (volume fraction)/10-2 ≥ 99.99 99.999 99.9999
Oxygen (O2) content (volume fraction)/10-6 ≤ 50 3 0.1
Argon (Ar) content (volume fraction)/10-6 ≤ — — 2
Hydrogen (H2) content (volume fraction)/10-6 ≤ 15 1 0.1
Carbon monoxide (CO) content (volume fraction)/10-6 ≤ 5 1 0.1
Carbon dioxide (CO2) content (volume fraction)/10-6 ≤ 10 1 0.1
Methane (CH4) content (volume fraction)/10-6 ≤ 5 1 0.1
Moisture (H2O) content (volume fraction)/10-6 ≤ 15 3 0.5
Contents of GB/T 8979-2008
Foreword i
1 Scope
2 Normative references
3 Requirements
4 Test methods
5 Packaging, marking, storage, transport and safety warnings
