Nitrogen gas is used to create an inert atmosphere in production, storage and transportation of easily oxidized products during high-temperature processes of metals, not interacting with nitrogen, for preservation of closed metal vessels and pipelines.
№ |
The name of indicators |
brand 5.0 |
|
I |
II |
III |
|
1 |
Volume fraction of nitrogen,%, not less |
99,999 |
|
2 |
Volume fraction of oxygen,%, not less |
5∙10-4 |
|
3 |
The volume fraction of hydrogen,%, not less |
1∙10-4 |
|
4 |
The volume fraction of carbon,%, not more** |
5∙10-5 |
|
5 |
Volume fraction of carbon dioxide,%, no more than** |
5∙10-5 |
|
6 |
The volume fraction of methane,%, no more than** |
5∙10-5 |
|
7 |
The volume fraction of water vapor in nitrogen gas,%, no more than |
5∙10-4 |
|
8 |
Oil content, solids and water in liquid nitrogen |
It withstands the test of paragraph 4.8. |
Notes:
** It is allowed in nitrogen instead of 5.0 brand figures 4, 5, 6 of Table 1 indicate the volume fraction of the amount of carbon-containing compounds based on the CH4