GENERATORJOE

This is a new pop-up window on top of your GeneratorJoe browser window.

CLICK TO CLOSE WINDOW  or  Click BACK on your browser to go back one page (if available).

CONVERTING GALLON OF PROPANE TO VAPOROUS PROPANE

SHORT ANSWER:
A 100 gallon tank of liquid propane will supply a generator operating at 75% capacity and burning 1.5m3/hr. for about 2.8 days. Only 80% of the tank capacity is useable so the running time on one tank is limited to about 2.4 days or 57 hours or less. In some case altitude and temperature will modify these results, however in most cases this formula will work.

Tank Size in Gallons   X   .81756  /  Fuel Consumption in m3/hr = generator running hours on this tank.

LONG ANSWER:
Using a standard conversion factor: 100 gallons of liquid propane converts to 378.5 liters of liquid propane

The compression ratio of vaporous propane to liquid propane is: 270:1.

Therefore 378.5 liters of liquid propane (x 270) will expand to 102195.0 liters when vaporized. 1.0 ml = 1.0 cm3 and 1,000,000 cm3 = 1 m3.

Therefore, 1,000,000 ml = 1 m3 also 1,000,000 ml = 1000 liters.

Therefore, 1000 liters = 1 m3.

Converting total liters to cubic meters
102195.0 liters / 1000 l/ m3 = 102.2 m3 vaporous propane = 100 gallons liquid propane originally. A ratio of 1:1

Finally, calculating the “run time".  for a 100 gallon tank with a generator running at 75% load consuming 1.5 m3/hr of propane.

Restated in formula format.
A 100 gallon tank (containing 102.2 m3 vaporous propane), burned at 1.5 m3/hr. (rated 75% capacity) = 68 hrs. or  2.8 days

If you use the 80% rule then that converts to 80 % of 2.8 or 2.27 days or 54.48 hours.

This can be restated in a formula as follows:

FORMULA ANSWER:

 Tank Size in Gallons   X   .81756  /   Fuel Consumption in m3/hr = generator running hours on this tank.

ENGLISH LANGUAGE DESCRIPTION OF THE FORMULA:

Take propane Tank Size (in Gallons) and multiply times .81756, this number is divided by Fuel Consumption (in cubic meters per hour) Equals hours of running time in hours for this tank.  If you require days, divide by 24.

Examples:

For a 100 gallon tank burned at a rate of 1.5 m3/hr, the estimated run time would equal 2.27 days

For a 150 gallon tank burned at a rate of 1.5 m3/hr, the estimated run time would equal 3.41 days

For a 200 gallon tank burned at a rate of 1.5 m3/hr, the estimated run time would equal 4.54 days

For a 100 gallon tank burned at a rate of 1.1 m3/hr, the estimated run time would equal 3.10 days

For a 100 gallon tank burned at a rate of 1.3 m3/hr, the estimated run time would equal 2.62 days

For a 100 gallon tank burned at a rate of 1.9 m3/hr, the estimated run time would equal 1.79 days

For a 200 gallon tank burned at a rate of 1.7 m3/hr, the estimated run time would equal 4.01 days

GeneratorJoe® will create a calculator for this formula as soon as we have time.  Happy Calculating!

Researched by Dave Cornelius, former science teacher, Cleveland, Ohio   A GeneratorJoe® Star

 Become a GeneratorJoe® Star! Click the Star for more information.

Do you have useful formula or helpful information that you would like to share?  Write to STAR@generatorjoe.net.

Copyright © 1999-2013 GeneratorJoe Inc. & GeneratorJoe®. All Rights Reserved.

This is a new pop-up window on top of your browser window.

CLICK TO CLOSE WINDOW