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Old 05-08-2016, 10:48 PM   #11
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I had forgot about them. Thanks.
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Old 05-09-2016, 12:06 AM   #12
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Quote:
Originally Posted by padlin View Post
Tractor Supply charges by the 10th of a gallon. 2 empty tanks yesterday, each took 4.6 gal.
How do you know they were empty? How do you figure out how much propane is left in a tank if it's only partly empty? How do you weigh volume?
Tare weight is what the tank weighs when empty. Tare weight ( likely 17 lbs. or so - it's marked on the tank ) plus 20 lbs for a total of 37 lbs. is a full tank. If it is half full it's 17 lbs. ( tare ) plus 10 lbs propane for 27 lbs.
27 lbs. equals 12,246.9948 grams.
What could be easier?
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Old 05-09-2016, 12:31 AM   #13
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Quote:
Originally Posted by gbaglo View Post
How do you know they were empty? How do you figure out how much propane is left in a tank if it's only partly empty? How do you weigh volume?
Tare weight is what the tank weighs when empty. Tare weight ( likely 17 lbs. or so - it's marked on the tank ) plus 20 lbs for a total of 37 lbs. is a full tank. If it is half full it's 17 lbs. ( tare ) plus 10 lbs propane for 27 lbs.
27 lbs. equals 12,246.9948 grams.
What could be easier?
There is no doubt a conversion from lbs to US gallons and back.
LP, Liquid Propane is a liquid I believe when compressed. It is a gas at standard temperature and pressure. The density could vary slightly with temperature.

From Wikipedia:

Density

The density of liquid propane at 25 C (77 F) is 0.493 g/cm3, which is equivalent to 4.11 pounds per U.S. liquid gallon or 493 kg/m3. Propane expands at 1.5% per 10 F. Thus, liquid propane has a density of approximately 4.2 pounds per gallon (504 kg/m3) at 60 F (15.6 C).


So from this 20 lbs of propane would be about 4.76 US Gallons
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Old 05-09-2016, 12:46 AM   #14
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So from this 20 lbs of propane would be about 4.76 US Gallons
So, the question becomes what is the tare weight of tank in gallons?
And, if you're going to sell propane in gallons and tenths of gallons, why not just go metric? You know, pounds?
I sense a conspiracy.
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Old 05-09-2016, 01:15 AM   #15
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I'm lazy... i simply bought one of these $16 hand scales... it works really well.



http://www.amazon.com/Grill-Gauge-GG.../dp/B0012GTU3O
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Old 05-09-2016, 01:19 AM   #16
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Simple answer - it does not matter.
Gallons is volume but also has a mass depending on product; tank is mass, but the tank can hold volume, or that volume can be converted to mass at a standard temp and pressure.
You think??

Weigh tank with LP remaining inside.
Subtract tank tare from total weight of tank plus LP.
This gives you weight of propane remaining in tank.
Divide propane weight by 4.2 lbs/US Gal - this gives you amount of LP in US gallons remaining in the tank.
Full tank is about 4.76 US Gal, or 20 lbs of LP.

I guess then the 80% rule comes in??

At that point no one cares how many gallons the tank weighs !@?#!

Pass the cheese please, keep the hole. Or give me the whole cheese if that is easier?
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Old 05-09-2016, 01:25 AM   #17
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That scale is ok, but it assumes a certain tare for the container. You can read the tare ( the empty weight - it's stamped on the container ) and use a luggage scale to determine how many pounds of propane are left. Subtract the tare weight from the scale weight and you get the weight of the contents. You can use your luggage scale for luggage and for propane.
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Old 05-09-2016, 01:28 AM   #18
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I've never really cared how much is left in a tank or how much it weighs when I have two. When one runs out and switches over I fill the empty. If going out for extended trip, I fill the service tank before leaving so I know I have two full tanks to start. Dont worry, be happy.
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Old 05-09-2016, 01:29 AM   #19
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Another irrelevant rule to confuse the consumer. Fill to 80 per cent.
But a tank filled to 80 per cent capacity holds 20 lbs. of propane.
More proof of a conspiracy.
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Old 05-09-2016, 01:32 AM   #20
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Quote:
Originally Posted by Greg A View Post
I've never really cared how much is left in a tank or how much it weighs when I have two. When one runs out and switches over I fill the empty. If going out for extended trip, I fill the service tank before leaving so I know I have two full tanks to start. Dont worry, be happy.
And, with that, I have to admit that I actually ran out of propane once in the middle of the night. I had two tanks and auto switch-over, but both tanks were empty.
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