Propane Help

[snowfighter]

Have a LP gas fireplace for back up. When the temp gets -35 below the fireplace will start to run and then go out.It will only work at about -25 and higher temp. I know I have a temp problem with gas vaporizing.I have a 3/8" copper line coming 30ft from the high pressure regular on a 250 gal tank at 60% to a low pressure regular on the house then 10ft of black 1/2" pipe running along the outside of the house before elbowing though the wall into the fireplace. The fireplace has a BTU setting of 28000 to 43000 and I have it set on the lowest it goes.I have heard of the use of a lightbulb(Alaska) in a can under the tank which I am trying.My LP provider turn the pressure up on the house regular as much as possible. Anyone have any imformation that would help???

[Hafnutz]

If I'm not mistaken..LP doesn't want to vaporize below -20 degress. I doubt that one light bulb under 250 gal tank is going to do much for you. Check with your supplier and see what they recommend. Maybe it would help to run most of your lines inside.

[Surface Tension]

I have a 250 gal propane tank for my 65,000 btu furnace and if it didn't vaporize I'd be without heat right now.

It is the surface area that helps the propane vaporize and 250 gallon tank has plenty of that.

Have your heating guy take a look at what you have.

[BobT]

Certainly as the temperature drops and it gets closer to the boiling point of LP, it will vaporize at a slower rate and system pressure will drop some but the dew point, or boiling point depending on your view, of LP is around -42, not -20 as suggested. At -25 degrees you shouldn't be having much trouble with the gas vaporizing.

[snowfighter]

-33 below this morning normally the fireplace won't stay lite like yesterday morning -35. I wraped the tank in a rv ground mat no insulation and put a 100 watt bulb in a can under the tank last nite at 10:00 this morning the fireplace is working perfect so it has to be the tank. My first thought is a insulated blanket or some kind of winter shelter. any thoughts?