LPG weight to volume unit

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LPG weight to volume unit

Postby Guest » Fri Apr 01, 2005 8:33 am

What is the volume in cubic feet of 100 lbs. of LPG contained in a cylinder?. Approximate size of cylinder is 12 inches diameter and 54 inches long. Consider an average temperature of 80 degrees farenheit.

Postby Guest » Fri Apr 01, 2005 8:33 pm

The tough part was finding density at 80 °F instead of the standard 60 °F. This table http://www.elyenergy.com/pdf/CO37.pdf gives 0.03257 ft^3/lb at 80 °F. So your 100 lbs occupies 3.257 ft^3 (ignoring the amount as vapor above the liquid).

The volume of a cylindrical tank is (pi/4)*(d^2)*h but your dimensions are in inches. Converting to feet,
(pi/4) * 1^2 * 54/12 = 3.53 ft^3.

So tank is pretty full. I don't know what the requirements are for expansion volume in the tank for warmer temperatures, but this seems "close". NOTE: The volume calculations assume these are inside dimensions. If they are outside dimensions a correction for wall thickness is required.

Postby Guest » Sat Apr 02, 2005 6:01 am

Based on the previous answer, and given the following condition, can you find out how much time would last a 100 lbs LPG cylinder, if we have an LPG power generator running with a fuel consumption as follows:

1/2 Load ........... 55.6 ft^3/hr
Full Load ........... 86.4 ft^3/hr

Required fuel pressure is 11"-14" of water column

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