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GB/T 8979-2008 PDF in English


GB/T 8979-2008 (GB/T8979-2008, GBT 8979-2008, GBT8979-2008)
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GB/T 8979-2008: PDF in English (GBT 8979-2008)

GB/T 8979-2008
GB
ICS 71.100.20
G 86
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing GB/T 8979-1996, GB/T 8980-1996
Pure nitrogen and high purity nitrogen and ultra
pure nitrogen
ISSUED ON. MAY 15, 2008
IMPLEMENTED ON. NOVEMBER 01 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of China.
Table of Contents
Foreword ... 3 
1  Scope ... 4 
2  Normative References ... 4 
3  Requirements ... 5 
4  Test Methods ... 5 
5  Packaging, Marking, Storage and Safety Warning ... 7 
Foreword
This Standard replaces GB/T 8979-1996 Pure nitrogen and GB/T 8980-1996 High pure
nitrogen.
Compared with GB/T 8979-1996 and GB/T 8980-1996, the main changes of this Standard
are as follows.
— To adjust the Normative References (Clause 2 in this Standard, Clause 2 in GB/T
8979-1996 and Clause 2 in GB/T 8980-1996);
— To modify the technical requirements for pure nitrogen and high nitrogen (Table 1
in this Standard, Table 1 in GB/T 8979-1996 and Table 1 in GB/T 8980-1996);
— To modify the determination methods of hydrogen, oxygen, carbonic oxide (Article
4.3 in this Standard, Article 4.3, 4.4 and 4.6 in GB/T 8979-1996 and GB/T
8980-1996);
— To add the determination methods of argon content (Article 4.5 in this Standard).
This Standard was proposed by China Petroleum and Chemical Industry Federation
(CPCIF).
This Standard shall be under the jurisdiction of National Technical Committee on Gas of
Standardization Administration of China.
Drafting organizations of this Standard. The Southwest Research & Design Institute of
Chemical Industry. (SWRDICI), and Oxygen Company of Wuhan Iron and Steel Group Co.,
Ltd.
Main drafters of this Standard. He Daoshan, Chen Yali, Tian Mingyong, and Li Hong.
The previous editions replaced by this Standard are as follows.
— GB/T 8979-1988, GB/T 8979-1996;
— GB/T 8980-1988, GB/T 8980-1996.
Pure nitrogen and high purity nitrogen and ultra pure
nitrogen
1 Scope
This Standard specifies the technical requirements, test methods, as well as packaging,
marking, storage, safety warning of pure nitrogen, high purity nitrogen and ultra pure
nitrogen products.
This Standard applies to gaseous or liquid pure nitrogen, high purity nitrogen and
ultra-pure nitrogen obtained from air separation or purification. They are mainly used as
the protective gas, replacement gas, reaction gas, etc.
Molecular formula. N2
Relative molecular mass. 28.1034 (according to relative atomic mass in 2005)
2 Normative References
The articles contained in the following documents have become part of this Standard
when they are quoted herein. For the dated documents so quoted, all the modifications
(excluding corrections) or revisions made thereafter shall not be applicable to this
Standard. For the undated documents so quoted, the latest editions shall be applicable to
this Standard.
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 moisture in gases—Part 2. 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
mathane in the gases-Gas chromatographic method
GB/T 14605 Determination of trace argon, nitrogen and krypton in oxygen-Gas
chromatographic method
HG/T 2686 HG/T 2686-1995 determination of trace hydrogen, oxygen methane,
carbon monoxide in inert gases—Zirconia detector
3 Requirements
Technical requirements for pure nitrogen and high purity nitrogen and ultra pure nitrogen
shall be in accordance with Table 1.
Table 1 Technical requirements for pure nitrogen and high purity nitrogen and
ultra pure nitrogen
Items Indicator Pure nitrogen High purity nitrogen Ultra pure nitrogen
N2 purity (volume fraction) / 10-2 ≥ 99.99 99.999 99.9999
O2 Content (volume fraction) / 10-6 ≤ 50 3 0.1
Ar Content (volume fraction) / 10-6 ≤ — — 2
H2 Content (volume fraction) / 10-6 ≤ 15 1 0.1
CO Content (volume fraction) /10-6 ≤ 5 1 0.1
CO2 Content(volume fraction)/10-6 ≤ 10 1 0.1
CH4 Content(volume fraction)/10-6 ≤ 5 1 0.1
H2O Content(volume fraction)/10-6 ≤ 15 3 0.5
4 Test Methods
4.1 Inspection rules
4.1.1 Bottled nitrogen shall be randomly sampled and checked according to the provisions
in Table 2. When there is any 1 indicator in the inspection results not meeting the
provisions of this Standard, then carry out the double-sampling check for the same batch
of products. If there is still any 1 indicator not meeting the provisions of this Standard, this
batch of product is deemed as unqualified.
Table 2 Bottled nitrogen sampling checklist
Product batch / bottle 1~2 3~8 9~15 16~25 26~50 ≥51
Sampling bottle-number / bottle 1 2 3 4 5 6
4.1.2 The inspection rules of nitrogen in pipeline transportation shall be implemented
according to the provisions of 4.1.4 specified in GB/T 3864-2008.
4.1.3 The inspection rules of liquid nitrogen, nitrogen in container lattice and bottled ultra
pure nitrogen shall be implemented according to the provisions of 4.1.5 specified in GB/T
3864-2008.
4.2 Purity
N2 purity shall be calculated as per Formula (1).
654321 10)(100   ... (1)
Where.
Φ is N2 purity (volume fraction), 10-2;
Φ1 is O2 content (volume fraction), 10-6;
Φ2 is H2 content (volume fraction), 10-6;
Φ3 is CO content (volume fraction), 10-6;
Φ4 is CO2 content (volume fraction), 10-6;
Φ5 is CH4 content (volume fraction), 10-6;
Φ6 is H2O content (volume fraction), 10-6.
4.3 Determination of hydrogen, oxygen, carbon monoxide, carbon dioxide and methane
contents in nitrogen
Use the gas chromatographs of detector with the zirconium oxide and hydrogen flame ion
detector to determine the hydrogen, oxygen, carbon monoxide, methane and carbon
dioxide in nitrogen.
The determination of hydrogen, oxygen, carbon monoxide, carbon dioxide and methane
in pure nitrogen and high purity nitrogen shall be implemented according to HC/T2686.
The detection limit is 0.1 × 10-6.
The determination of hydrogen, oxygen and methane in ultra pure nitrogen shall be
implemented according to HC/T2686. The determination of carbon monoxide and carbon
dioxide shall be implemented according to HC/T 8984.1. The detection limit. 0.05 × 10-6.
For oxygen content, it allows to adopt the provisions of GB/T 6285 to perform the
determination. The hydrogen content allows to adopt the provisions of GB/T 8981 to
perform the determination.
4.4 Determination of water content
It shall be implemented according to GB/T 5832.1 or GB/T 5832.2. When there is dispute
about the determined results, the method specified in GB/T 5832.2 shall be the arbitration
method.
4.5 Determination of argon content
Principles and general requirements shall be implemented according to GB/T 14605. It is
recommended to select chromatographs of detectors with HID or DID, deoxidation device
and main peak cutting process. Detection limit. 0.2 × 10-6. Chromatographic column. the
length is about 3m; 5A or 13X molecular sieves are installed in it. After setting aside the
peak of argon, the main-peak nitrogen shall be cut out. The rest operation shall be
according to instrument’s manual.
4.6 Standard samples
It shall be prepared with nitrogen as the base gas. The contents of hydrogen and oxygen
constituents are 1 × 10-6 - 10 × 10-6 (volume fraction) respectively; the contents of carbon
monoxide, carbon dioxide and methane are 1× 10-6 to 5 × 10-6 (volume fraction)
respectively; and the argon content is 2× 10-6 - 5× 10-6 (volume fraction).
5 Packaging, Marking, Storage and Safety Warning
5.1 Packaging, marking, storage and safety warning of pure nitrogen, high purity nitrogen
and ultra pure nitrogen shall be implemented according to Chapter 5 of GB/T 3864-2008.
5.2 The containers of packaging nitrogen shall be marked with the yellow words of "pure
nitrogen", "high purity nitrogen", and “ultra-pure nitrogen".
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.