×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Flammability of gases

Flammability of gases

Flammability of gases

(OP)
Hello

i would like to know how to calculate the flammability limits of a gas that consist in flammable gas + non-flammable gas + air. More exactly when there are two different non-flammable gases in the mixture

Thank  you very much
Christian.Perez@ulg.ac.be

RE: Flammability of gases

I would like to help you out, but I'm not sure if I can.  For HEL and LEL, I just use the tabulated numbers our safety people give us.  

Do the tables have calculations of explosive limits in oxygen deficient atmospheres?  Or are you working on sustaining a flame with a poor fuel gas?  Or maybe you have another application entirely?

dwedel
Hotrod Big Engines!
For site policies and guidelines
see FAQ731-376

RE: Flammability of gases

(OP)
Hello dwedel,

I am working with fire in under-ventilated situation. To explain that, imagine that fire room full of unburn and not-unburn gases and at this time not oxygen available.

If now, we open a window, a new supply of fresh air enters the compartment. So the mixture will be pass across the UFL and then across the LFL.

Doing that when non-flammable gases are present is easy but I dont know how to do with non-flammable gases.

Thanks a lot!!

RE: Flammability of gases

I have no experience in this situation.  Good Luck,

dwedel
Hotrod Big Engines!
For site policies and guidelines
see FAQ731-376

RE: Flammability of gases

I'm not sure how much assistance we will be to you at this forum.  We “try” to get a completely new charge of air in the combustion chamber each time, so we don’t have to calculate the effects of unburned gasses.

Just a friendly warning, be sure to state your complete situation in your question, as people are getting more picky about poorly written questions.  Reading the FAQ in my signature is not a bad idea either, but you have probably seen that already.

dwedel
Hotrod Big Engines!
For site policies and guidelines
see FAQ731-376

RE: Flammability of gases

To moquiton,

you say

Quote:

..so the mixture will be pass across the UFL and then across the LFL.

How do you know that you'll be out of the fire envelope.

Then you say

Quote:

Doing that when non-flammable gases are present is easy but I don't know how to do with non-flammable gases

This is a self-contradictory expression. Please be more clear.

RE: Flammability of gases

Hi-  there is some info on this in a book called "Technical Data on Fuel"  published by The British National Committee, Wold Power Conference, 1962.  See p. 262 in the section called Inflammability Limits.  The info is based on old Bureau of Mines bulletins.  You can buy the bulletins on the web.  The upper & lower flammability limits are listed for some different fuels.

RE: Flammability of gases

See also my, and other answers to this question on Thread798-33615

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close