Originally Posted by email@example.com
I need to purchase two LP tanks. The first tank will hold 115 gallons of lp gas, the second tank will hold 250 gallons of LP Gas. The LP tanks are sold by weight i.e. 100 pounds. How do I determine how much gas a 100 pound tank will hold?
In the US and Canada, LPG is >95% propane and has a density of 0.51 kg/L (for the liquid). This converts to about 4.36 pounds per US gallon. You need roughly 500 lb and 1100 lb tanks.
In other countries, LPG may be a seasonally adjusted mix of propane and butane to lower the vapor pressure. As butane is heavier, density may range from 0.54 - 0.57 kg/L depending on the mix.