×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Methane Number Calculation
2

Methane Number Calculation

Methane Number Calculation

(OP)
Hi everybody,

I preiouly posted this question in another forum. Can anybody help?

I am trying to figure out how to calculate the Methane Number (MN) for a given gas composition. I tried to find some information in the literature but was not successful.

I only found the following formulas:

MON = -406.14 + 508.04*(H/C) – 173.55*(H/C)^2 + 20.17*(H/C)^3
MN = 1.624*MON – 119.1

with H/C being the hydrogen/carbon ration. (MON = motor octane number).

Having tried it on several gas compositions, I am always off by some 10% of the real MN number. Even if I take 100% CH4,I get a MN=108 which is obviously wrong.

Would it be possible to calculate the MN of the gas composition based on the MN of the various constituents multiplied by the Mol %, such as done to calculate the Molecular Weight of the gas? If yes, where can I find the MN numbers for the various elements?

Thanks in advance.

RE: Methane Number Calculation

I hope I am not to late to this discussion, but I think a Caterpillar rep gave me the program they use for performing methane number calculations.  I suggest you contact your local rep.  If you don't succeed, then I might be able to find it and see if it is transmittable.  I do not know the calculation method.  Please re-post if you want me to look for the program.

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!


Resources