What is the psi on a 20 lb propane tank?

Answer 1

The pressure inside a propane tank depends on the ambient temperature of the tank and if Liquid Propane Gas (LPG) is present inside the tank. It has nothing to do with the size of the tank. A 20 lb tank that is not more than 80% full, in an 100 degree F environment, with LPG in it, will have approximately 172 PSIG, just as a 200 lb that is not more than 80% full, in an 100 degree F environment, with LPG in it, will have approximately 172 PSIG.

Examples are: A tank with LPG (no more than 80% full) at 80 degree F with have 128 PSIG, 60 degree F with have 92 PSIG, 30 degree F with have 51 PSIG, and -20 degree F with have 11 PSIG.

This explains the decrease in pressure as you use a large amount of propane from a tank quickly. The tank cools due to the venture effect which drops the temperature of the LPG. The drop in temperature results in a drop in pressure. When the tank warms up, as long as Liquid Propane Gas is still present the pressure will go up.

(For a more detailed chart go to http:/www.propanecarbs.com/propane.html )

Answer 2

As long as their is some liquid propane left inside the vessel the psi will change with the temperature.

Makes no difference what size the vessel is, 20lb-1000lb same temperature same pressure.

At 80 deg F the pressure is about 80psi.

Answer 3

Propane vapor inside the tank is temperature dependent. It is at 0psi at -40degF as this is the boiling point of propane to about 200psi at 120degF.

Propane is at about 100psi at the room temperature.

Answer 4

A 1lb. tank has 197 psi, according to Bernzomatic's website. I assume a 20lb. tank would be the same pressure because it would turn to liquid at the same point.