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Old 07-03-2015, 06:30 AM   #1
epj
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100 lb. propane tank

Our 2002 HR literature says we have a 100 gallon propane tank. In fact, I believe it is a 100 pound tank. Anyway, I had it filled the first time yesterday. The gauge was reading about a quarter full. It held about 10 gallons. I was expecting it to hold more than that. I realize they are full at 80%, but just trying to figure out if my gauge is reasonably accurate. Anyone know what the capacity of these tanks in gallons would be?
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Old 07-03-2015, 06:49 AM   #2
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Liquid propane weighs 4.24 pounds per gallon, so a 100 pound tank holds 23.5 gallons, less 20% equals approximately 19 gallons at 80 percent full. The gauges are not particularly accurate. I usually start thinking about filling it when the gauge reads below half a tank.
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Old 07-03-2015, 06:50 AM   #3
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Propane weighs 4.24 pounds per gallon. So 80 pounds is 18.87 gallons.
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Old 07-03-2015, 07:12 AM   #4
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Most tanks are have a tag listing water capacity (WC).
if you have a 25 gal water capacity tank that = 23.6 gals of propane.
and 100 pounds of weight in propane.

Don't subtract 80% twice
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Old 07-03-2015, 07:30 AM   #5
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Monaco products of "our" era have 38 gal. tanks...
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Old 07-03-2015, 07:39 AM   #6
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A 100# tank is designed to hold 100# of propane -- not 80#. Sure, 100 minus 20% is 80, but that's not how it works. If the tank was only capable of carrying 80# of propane, it would be an 80# tank.

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Old 07-03-2015, 07:48 AM   #7
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Quote:
Originally Posted by epj View Post
Our 2002 HR literature says we have a 100 gallon propane tank. In fact, I believe it is a 100 pound tank. Anyway, I had it filled the first time yesterday. The gauge was reading about a quarter full. It held about 10 gallons. I was expecting it to hold more than that. I realize they are full at 80%, but just trying to figure out if my gauge is reasonably accurate. Anyone know what the capacity of these tanks in gallons would be?
epj
A 100 gallon propane tank when filled to the recommended 80% level holds 80 gallons, (339.2 pounds), of propane.

A 100 pound propane tank holds up to 100 pounds, (23.58 gallons), of propane.

I don't know which you have.
Sorry

I do know that my coach has a 35 gallon propane tank... (which holds 28 gallons when filled to the recommended 80% level).
Since propane weighs 4.24 lbs per gallon my tank holds up to 118.72 lbs of propane.

BTW, neither the gauge on my LP tank or the LP level LEDs on my monitor panel have ever been accurate... (however they do give me an indication of the approximate amount of propane in my tank).

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Old 07-03-2015, 07:59 AM   #8
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Thanks. I suspected the gauge was not all that accurate. After being filled, it reads just over 3/4. Maybe that's the 80%. Looking at the tank, 38 gallons seems about right. There are some numbers on the tank, but very hard to read.
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Old 07-03-2015, 09:27 AM   #9
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I'm the same. I also have 100 lb tank. The gauge on the tank isn't real accurate. I thought I took a couple pictures of "E" and "F" when I filled it last month. but can't find them.

Anyway, mine took 18 gallons at the last fillup and I know it was almost empty.
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Old 07-03-2015, 09:39 AM   #10
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The owner's manual for my 2002 Windsor says the propane tank is 43 gallons. I don't know if that's "total" or "usable" gallons?
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Old 07-03-2015, 09:41 AM   #11
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It held about 10 gallons. I was expecting it to hold more than that.
So what did you buy with all that money you didn't expect to save.
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Old 07-04-2015, 10:14 AM   #12
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My coach specifications say it has a 39 gallon propane tank, but that the usable capacity is 80% of that, or 31.2 gallons. The last time I filled it when it was completely empty, it took an even 31 gallons until the over fill float valve closed it off. So that sounds in the ballpark. My propane gauge is the silly F, 2/3, 1/3, E lights: when completely empty it did show E, and when filled it did show F.

That 31 gallons would be 131 pounds of propane.

Quote:
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Our 2002 HR literature says we have a 100 gallon propane tank. In fact, I believe it is a 100 pound tank.
I would guess you are correct. It seems like a 100 gallon tank would be a very large tank.
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