Hydrogen limits
Hydrogen limits
(OP)
Known is that the LEL/UEL of hydrogen in air is: 4.1%-76%
In our plant we have the following mixture:
2,0% Oxygen
4,5% Hydrogen
0,5% Nitrogen
93% Argon
Pressure and temperature of this gas mixture: 400dgrC, 4,5barg
What is the LEL/UEL in this mixture?
Does the temperature and the pressure have any influence on the LEL/UEL?
Thanks
Cryotechnic
In our plant we have the following mixture:
2,0% Oxygen
4,5% Hydrogen
0,5% Nitrogen
93% Argon
Pressure and temperature of this gas mixture: 400dgrC, 4,5barg
What is the LEL/UEL in this mixture?
Does the temperature and the pressure have any influence on the LEL/UEL?
Thanks
Cryotechnic
"Math is the ruler of your potential succes...."





RE: Hydrogen limits
I would try this on the occupational health and safety board.
Dave Hasse
dave.hasse@Air Liquide.com
RE: Hydrogen limits
There is no reaction in your existing mixture?? I would expect it.
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Hydrogen limits
In our proces we start with the following mixture:
2,0% Oxygen
0,5% Nitrogen
97,5% Argon
temperature and pressure of this mixture: 20dgr C and 4,5barg
Than we supply 4,5% hydrogen to this mixture. The mixture runs through a catalyst. Here the Oxygen and Hydrogen reacts to water. Heat is formed with thes proces
After the catalyst the mixture has a temperature of 400dgrC.
So in the proces before the catalyst, we have oxygen, hydrogen, argon, nitrogen. The LEL/UEL I'm looking for are related to that part.
@EdStainless,
Do you have the data you are talking about? Or do you know where to find it?
Cryotechnic
"Math is the ruler of your potential succes...."
RE: Hydrogen limits
also the lel and uel stand for lower explosive limit and upper respectively. the lower and upper flamability limits are what you have stated before. the explosive limits for hydrogen LEL 15.9% and the UEL 59% in air. these limits change with the temperature of air. I don't have any data for hydrogen you can use sorry. but my opinion is you wont have a problem at that temp anyway
RE: Hydrogen limits
Thank you Hydro. Your right when you say that when exceeding the LEL/UEL at 400dgrC the hydrogen will not auto ignite... BUT your only an ignition source away of big problems.
The LEL 15,9% and the UEL 59% for hydrogen in air, is that at 400dgrC?
Cryotechnic
"Math is the ruler of your potential succes...."
RE: Hydrogen limits
RE: Hydrogen limits
RE: Hydrogen limits
thank you for your help
Cryotechnic
"Math is the ruler of your potential succes...."