The ubiquitous 4.73 gallon (20lb) propane tank is usually pressurized at 177 psi, which is the perfect amount to keep propane in a liquid state at 100 degrees F. Although it can be pressurized with a higher psi, there is no need to since this is the optimal pressure point.
Doesn’t it depend on how much propane is in the tank? We fill the tanks with gas, which would be like filling a tire with air. The less air in the tire, the less air pressure. So the less gas in the tank, the less pressure. So wouldn’t 177 psi be the full tank pressure?
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