Filling of Propane tank

Dutch_12078 wrote:

time2roll wrote:
Less chance of getting any butane mix at 8900 feet.

LPG (commercial propane) typically contains 90%+ propane and less than 10% butane.

Nobody in the USA produces Butane for USA LP fillers. They do have Butane in Mexico. Doug

craig7h, which ever is colder!

I get my tanks filled t place that charges me my the gallon. They set the tank on a scale to tell when the tank is at max full and charge me for the gallons to top off.
Most of the places around here that exchange tanks are currently selling 15 pounds of propane in the tanks. They tell you on the sign that is posted that you are paying for 15 pounds so it is not fraud. You just have to read the sign.

Are you sure it isn't the person who's doing the filling that's shorting you? I get tanks filled at Costco, Glendale Az. And they short all of them 2 pounds. I get them back to Co. And I top them, to the OPD float valve, no problem.
LP and NG etc. automatically derate at higher elevation because the density is lowered. Its either Charles or Boyles law. It been too long since college! The formula is very simple. It has to do with old and new volumes and pressures. Craig

time2roll wrote:
Less chance of getting any butane mix at 8900 feet.

LPG (commercial propane) typically contains 90%+ propane and less than 10% butane.

Less chance of getting any butane mix at 8900 feet.

Grit dog wrote:
Not sure what sparked the question...maybe be more specific as to your concerns.
(FWIW, there aren't any, based on altitude)

Correct. What DOES affect DOT tanks is HEAT. Fill a DOT 20# at Ambient 40 degrees and slightly overfill(it can be done even with Auto shut off) and take that unused tank to 100 degree ambient and odds are the Safety blow off valve will release. A correctly filled DOT may still have the same problem when you fill at a lower temp(below 50 degrees) and then go to a higher degree area(over 90 degrees), which is easy to do, if you do not use that tank. Fill in the winter and not use and then take it out in the hot summer. This used to be more of a problem years ago(DOT tanks had no auto shut off)when unqualified/Ignorant LP fillers would attempt to "top off" the DOT fill and not fill by weight. Now, with Auto shut off fill valves this is a rare occurance. Doug

Not sure what sparked the question...maybe be more specific as to your concerns.
(FWIW, there aren't any, based on altitude)

tank is a closed pressure vessel....atmospheric pressure has no affect on the internal pressure.
**Can affect the fuel/air ratio AT the appliance burners

tank is under 100#-250# depending on the Temperature of the ambient air as heat can cause more or less liquid to vapor action

Top off as needed wherever you are.

They will pump liquid into tank until:
Fix Gauge spews liquid (bleed valve cracked open during filling)
OPD shuts off flow
**Both are set for 80% tank capacity as that is FULL

The "L" in LPG is for liquid. They are putting a liquid in the tank.

There may be a difference but so small, you likely couldn't measure it.

Temperature and altitude can mess with the appliances that use the LPG. The propane evaporates and passes thru the piping systems as a gas. Here altitude can have an impact as there is less oxygen available.