Hybrid Car – More Fun with Less Gas

auto-changeover propane regulator - Page 5

register ::  Login Password  :: Lost Password?
Posted by krw@att.bizzzzzzzzzzzz on June 27, 2010, 9:13 pm

On Sun, 27 Jun 2010 13:23:20 -0500, The Daring Dufas

Unlike propane, natural gas can't be in the liquid state at room temperature,
so must be transported cryogenically or compressed under extreme pressure.
Cryogenics are complicated, heavy, and require energy themselves.  A highly
compressed flammable gas isn't exactly a good vehicle fuel either; not enough
can be carried safely.

Posted by The Daring Dufas on June 28, 2010, 1:44 am

On 6/27/2010 4:13 PM, krw@att.bizzzzzzzzzzzz wrote:



Aren't there many LNG tankers plying the worlds oceans? I have never
fiddled with any liquefied gaseous fuels other than what's commonly
for sale around here. Butane, propane, MAAP and a few other fuels for
brazing or welding. I saw a new one on sale at Home Depot the other
day that goes along with a new tank and torch design. I don't recall
the name and I'm too lazy right now to look for it. *snicker*


Posted by krw@att.bizzzzzzzzzzzz on June 28, 2010, 3:27 am

On Sun, 27 Jun 2010 20:44:02 -0500, The Daring Dufas




Yes, they're essentially dewar flasks carrying LNG at some -250F.  That's
pretty difficult to do in a car.

Butane is a liquid at room temperature an pressure.  Propane can be a liquid
at room temperature with a pressure of a few atmospheres; easily done in your
backyard grill tank.  Methane (natural gas) isn't so easy.  It cannot be a
liquid at room temperature at any pressure.  Actually, it has no phase change
at room temperature, at any pressure.  LNG is totally unsuitable for mobile

Posted by m II on June 28, 2010, 2:17 am

Wrong! Where do you idiots get this information?
Propane liquefies about 150 PSI at room temperature. NG takes much more



Posted by krw@att.bizzzzzzzzzzzz on June 28, 2010, 3:34 am

Certainly a better place than do you!

At least I can read.  You should try it some day.

Methane doesn't liquefy *AT ALL* at room temperature.  Its critical point (the
temperature and pressure at which it will no longer liquefy) is -115F at
673psia.  Look it up, then come crawling back with your tail between your
legs.  ...or not.

This Thread
Bookmark this thread:
  • Subject
  • Author
  • Date
please rate this thread