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Propane has a freezing point of -44 degrees Fahrenheit.A 500 gallon propane tank is a big domestic gas tank. It can contain up to 400 gallons of propane. The empty weight of a 500 gallon propane tank is approximately 949 pounds. A full 500 gallon propane tank weighs 2,649 pounds when filled to 400 gallons of propane.Propane is a vaporous gas in its natural condition. LPG, or liquefied petroleum gas, is created by pressurizing propane gas below its boiling point of -44 degrees Fahrenheit. Propane pressure should generally be between 100 and 200 psi to guarantee that liquid propane gas remains liquid. At 70 degrees, a conventional 20-pound propane tank will have an internal pressure of 145 psi. On a 100-degree day, the same tank will have 172 psi of pressure.To comply with the 80/20 rule for propane safety, a 500-gallon propane tank can only securely carry 400 gallons of propane. The 20% of vacant space in your propane tank offers that opportunity for expansion such as that from a hot summer day. You should never paint your gas tank a dark color for safety reasons. Lighter colors reflect heat from the exterior, while darker colors absorb it, resulting in harmful propane expansion.