How do you figure that actual capacity of a cng tank?

[rduanew]

I have been trying to find out what the conversion is for taking the water volume, that all cng tanks note, and finding what the gge is for that tank. Is there a formula that exists or do you have to physically fill it up to find out?

[jetboatjohnny]

Re: How do you figure that actual capacity of a cng tank?

Go to the "tank" thread below, got to the links/pdfs in the last posting, and you can get an idea.
I figure the capacity is about 1/3 whatever the water volume would be.

http://www.cngchat.com/forum/showthread.php?t=1453

[Highmarker]

Re: How do you figure that actual capacity of a cng tank?

Here is a link to Wikipedia on GGE.

http://en.wikipedia.org/wiki/Gasoline-equivalent_gallon

There it explains it all (in geek terms).

[Idarusskie]

Re: How do you figure that actual capacity of a cng tank?

http://www.casperstartribune.net/articles/2007/09/17/news/wyoming/236f24071803ea6b8725735800211077.txt

Look at this article. If you look at the price of gas in Cheyenne( at least last September when this was written) and compare it with the price in California. You can see why Utah is so cheap.

If I take the above reference which says 1 gge is 127.7 cubic feet then that makes the cost at Cheyenne to be about 16 cents a GGE. is that right?
and 45 cents a gge in Californian. before compression. check my math...

Now if I can only get Idaho to put some stations up.

[freedml]

Re: How do you figure that actual capacity of a cng tank?

Here goes...

If the tank holds 10 gallons of water, that's 1.337 cu ft. If you compress the gas to 3000psi that's about 200 atmospheres. So, 200x1.337 is 267.4 cu ft. of gas, or a little over 2 GGE.