How much dry ice is recommended for inerting a 100-gallon tank?

For inerting a 100-gallon tank, the recommendation of 1.5 pounds of dry ice is based on achieving a safe and effective concentration of carbon dioxide in the tank. Inerting is a process used to displace flammable or explosive vapors with an inert gas, in this case, carbon dioxide produced from the sublimation of dry ice.

The amount of dry ice needed is carefully calculated to ensure that the concentration of oxygen in the tank is reduced to levels that prevent combustion. Using too little dry ice may not sufficiently lower the oxygen levels, while too much could create an unsafe atmosphere or lead to excessive pressure buildup during the demonstration.

A recommendation of 1.5 pounds is generally accepted as the optimal amount for a 100-gallon tank to balance effectiveness with safety considerations.