×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# BTU FROM PERCENT METHANE2

## BTU FROM PERCENT METHANE

(OP)
HELLO: I WAS HOPING A PROFESSIONAL IN THE FIELD COULD HELP WITH VERIFICATION. I DID GOOGLE AND FOUND A LOT OF HELPFUL INFORMATION,BUT THAT FINAL VERIFICATION WOULD REALLY HELP.I WANT TO KNOW HOW TO CALCULATE BTU OF METHANE FROM PERCENT BY VOLUME OF METHANE GAS. FOR EXAMPLE: I HAVE 10% METHANE(FROM METHANE DETECTOR ON A MUD LOGGING SITE), WHAT IS THE BTU...A FORMULA AND TO WORK THIS EXAMPLE WITH AN ANSWER WILL BE SUPER HELPFUL.THANK YOU...

### RE: BTU FROM PERCENT METHANE

(OP)
HI: MOSTLY AIR,A SMALL TRACE OF CO2 USUALLY LESS THEN 1%...

### RE: BTU FROM PERCENT METHANE

BTU is a measure of energy. To calculate energy you need to know the mass of the gas or volume at standard conditions, not just percent. Also methane will only burn between about 5 to 15% in mixture with air.

As you've probably discovered, BTU/ scf of pure methane is about 1020BTU/scf. % methane is therefore irrelevant, it's total quantity (standard volume or mass) you need. So if you have one standard cubic foot of 10% methane in air, then you have energy in BTU, if you can burn it, of about 100 BTU. Unless you know standard volume or mass you can't calculate it.

Unless you've got virtually pure methane though, this could be quite different if you've got a mixture of methane, butane, propane and other gases commonly found when coming out of the ground.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

### RE: BTU FROM PERCENT METHANE

(OP)
HI:OK SO I KIND OF GOT THE IDEA NOW...HOW DID YOU COME UP WITH 100 BTU WITH MY EXAMPLE??? Link THE ENCLOSED THREAD HAS THIS FORMULA...

### RE: BTU FROM PERCENT METHANE

For youe gas, btu/cf = 10 x % methane.

For 100% methane, 10 x 100 = 1000 Btu/cf.

For 10% methane, 10 x 10 = 100 Btu/cf.

What are you planning to do with this gas? Pipe it somewhere and burn it? Just curious.

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

### RE: BTU FROM PERCENT METHANE

(OP)
HI: I DESIGN ELECTRONIC CIRCUITS. SOME INSTRUMENTATION FOR MUD LOGGERS IN OIL AND GAS.USUALLY I BUY PRE MADE SENSORS AND BUILD CIRCUITS AROUND THEM..SO I WAS TALKING TO SOMEONE,THEY SAID THEY USE A HANDHELD SENSOR THAT MEASURES PERCENTAGE OF METHANE,FROM THE GROUND,CONVERTS IT TO BTU. THEY DO SAY IT IS NOT AT ALL PRECISE. THERE ASKING FOR BETTER PRECISION..SO THAT IS MY CONFUSION:THE PERCENT TO BTU IDEA...ANY IDEAS???

### RE: BTU FROM PERCENT METHANE

Hand held sensor measuring percent methane, no problem, plenty about.

Convert to BTU, impossible without measuring volume or mass.

Convert to BTU per scf of the air / methane mix, multiply percent by 10. Not incredibly accurate, but not far off.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

### RE: BTU FROM PERCENT METHANE

(OP)
WELL I HAVE LEARNED A LOT THROUGH THIS DISCUSSION.NOW I KNOW WHAT I NEED TO MAKE THE INSTRUMENT WORK RIGHT. MUCH THANKS FOR YOUR TIME AND EXPERTISE. I AM SURE I WILL BE BACK WITH OTHER GAS RELATED QUESTIONS...THANK YOU SO MUCH AGAIN...

### RE: BTU FROM PERCENT METHANE

Looking at this again, the other reason as said by others is that the gas they are measuring probably contains other gases apart from methane (although methane is probably the highest component) which can signficantly affect the BTU / scf calcualtion. If you liked the posts there is a button for that...

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

#### 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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!