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Old 04-16-2014, 11:38 PM   #1
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The specs on my class C say the propane tank is 51 pounds what does that equal in gallons?

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Old 04-17-2014, 01:01 AM   #2
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Pretty sure that would be about 11 to 12 gallons.

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Old 04-17-2014, 01:06 AM   #3
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Originally Posted by Cola ny View Post
The specs on my class C say the propane tank is 51 pounds what does that equal in gallons?
4.2 lb/gal. @ 60 deg.
So.......51/4.2= 12.14 gallons
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Old 04-17-2014, 07:44 PM   #4
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Could be tricky if they didn't say just what weight they are quoting. If the use the weight stamped onto the tank itself, a number called WC, that is based on water weight, not propane, so the correct division is 51/8.3 and thus 6.15 gallons.

WC is the weight of the water needed to fill the tank 100%. But then you have to remember that a propane tank is only filled 80% and that propane weighs a lot less per gallon than water. A short cut formula is that the tank can hold propane equal to 42% of the WC value. A standard "20 lb" portable LP tank used on BBQ grills has a WC value of about 48.

But if they are quoting the actual weight of the propane in the tank, the numbers the others calculated for you are correct.
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Old 05-23-2014, 07:51 AM   #5
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51 divided by 4.24 the weight of a gallon of propane.
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Old 05-23-2014, 05:41 PM   #6
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I do believe, a gallon of propane and a gallon of water take the same room in the tank. Last time I checked, a cubic foot of air and a cubic foot of water were still the same. But your 51 should be WC in pounds. Thus 80% should be just over 9 gallons usable.

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