Need for L.P Gas Conversion?

Question

I have a Genset which comsumes at a rate of 260CFH from L.P Gas. How many gallon tank of L.P Gas do I need for 72 hours of continous operation. Also, what rate of fuel consumption does that equate per hour. Gallons/per/hour

Answer 1

LP Gas is propane (C3H8) with a molecular weight of 44 so 44 gm at standard conditions occupies 22.4 liters for a density of 0.123 lb/ft^3. At 260 CFH you will use 31.9 lb/hr. Propane liquid has a density of 0.582 gm/cc or 4.86 lb/gal. So for 72 hours you need:

0.123 lb/ft^3 x 260 ft^3/hr x 72 hr x 1 gal/4.86 lb = 473 gallons gallons.