Originally Posted by Minggat
I have no idea what they are in pounds, but they hold 2.1 gallons each...
Since liquid propane is about 4.2 pounds per gallon, your tank would be approximately 9.24# - or 10 pounds “nominal”.
The most accurate way to measure the propane in a propane tank is to weigh it. Stamped into the side of the tank should be the letters TW followed by a number. This number is the weight in pounds of the tank when empty, or its tare weight.
To fill the tank properly, the dealer must calculate the maximum safe fill from the Water
Content (WC) value stamped on the tank. The maximum amount of propane that can be placed in the tank is 42% of the WC value.
When filling your cylinder with a scale, the attendant will attach a nozzle to your cylinder. The weight of this nozzle must be accounted for, or, unless they are charging
a flat rate, you will be paying for it!
See also, an earlier discussion at:
➥ Propane cylinders