Liquified nitrogen system operation
Liquified nitrogen system operation
(OP)
Sirs,
I am working on the project which includes the replacement of manual type of operation of liquified nitrogen system (storage and vaporizer) with automatical type.
Now the liquified nitrogen storage is connected to vaporizer and being operated manually. Flow is being controlled by valve (one of DBB valves) located just downstream of the liquified storage and before vaporizer.
We are going to put a control valve downstream of vaporiser. This control valve will be activated as pressure in the main nitrogen supply system is below the normal operation pressure.
Could you please help me to find if it is any safety related issue associated with our modification?
I am working on the project which includes the replacement of manual type of operation of liquified nitrogen system (storage and vaporizer) with automatical type.
Now the liquified nitrogen storage is connected to vaporizer and being operated manually. Flow is being controlled by valve (one of DBB valves) located just downstream of the liquified storage and before vaporizer.
We are going to put a control valve downstream of vaporiser. This control valve will be activated as pressure in the main nitrogen supply system is below the normal operation pressure.
Could you please help me to find if it is any safety related issue associated with our modification?





RE: Liquified nitrogen system operation
Check with your supplier. A lot of companies have Nitrogen under PSM and they have some policies that you need to follow.
Regards StoneCold
RE: Liquified nitrogen system operation
if your "take" is greater than the vaporizer's sizing, you can have liquid entering the header piping. typically, the main headers are not of a design that they can take either very low temperatures or thermal shock.
RE: Liquified nitrogen system operation
Thank you very much for your help.
StoneCold,
What does PSM mean?
RE: Liquified nitrogen system operation
PSM is process safety Management. It is a policy/practice mandated by OSHA in the US for large volumes of potentially hazardous materials. The danger from liquid Nitrogen obviously being freeze contact and suffocation.
Regards
StoneCold