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