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Old 11-29-2024, 07:41 PM   #1
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Default lpg volume in cold weather

From what I read, the volume of LPG decreases as the weather cools. Does anyone know how much the liquid volume in a propane tank decreases from 70 degrees to 30 degrees ambient temps?

My OPD will shut off the tank at 7 gallons at 70 degrees, but it seems to take more in colder weather. I am wondering how much more: could it be a noticeable amount, say a half-gallon or more?
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Old 11-29-2024, 08:42 PM   #2
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I think this chart is probably the correct one, but can't prove that as all the information is very sketchy that I found.


One place said 1.5% per 10*F others said 2%.


The chart seems to indicate that it changes at about .002 gallons per *F per gallon so that would be 2% per 10*F.
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Old 11-29-2024, 08:44 PM   #3
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Quote:
Originally Posted by RT-NY View Post
From what I read, the volume of LPG decreases as the weather cools. Does anyone know how much the liquid volume in a propane tank decreases from 70 degrees to 30 degrees ambient temps?

My OPD will shut off the tank at 7 gallons at 70 degrees, but it seems to take more in colder weather. I am wondering how much more: could it be a noticeable amount, say a half-gallon or more?
Very little difference, must be another mechanism in your tank in play.

https://nda.nebraska.gov/fscp/wam/ce...rea35_2018.pdf
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Old 11-29-2024, 08:49 PM   #4
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Very little difference, must be another mechanism in your tank in play.

https://nda.nebraska.gov/fscp/wam/ce...rea35_2018.pdf

That chart I posted is from the link that GeorgeRa put above.


The 40*F the OP referenced would give 8% change in the liquid propane volume so about .56 gallon less for a 7 gallon tank and 40*F change if I did it all correctly.
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Old 11-29-2024, 09:09 PM   #5
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The 30*F the OP referenced would give 6% change in the liquid propane volume so about .4 gallon less for a 7 gallon tank and 30*F change if I did it all correctly.
If it is 2% per ten degrees, wouldn't a change 70 to 30 degrees be 8%, which would be about a half gallon in a tank that holds seven gallons?
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Old 11-29-2024, 09:16 PM   #6
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If it is 2% per ten degrees, wouldn't a change 70 to 30 degrees be 8%, which would be about a half gallon in a tank that holds seven gallons?

My mistake, I thought you had 70 to 40


Yes 8% and .56gal.
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