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Open Roads Forum  >  Tech Issues

 > 30# propane tank filled weight?

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camillit

SE Pennsylvania

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Posted: 10/05/09 09:23pm Link  |  Print  |  Notify Moderator

I am very frustrated in researching the Internet and I am good at it. I have 2-30# LP tanks, nothing special. I am trying to find a simple on-line calculator that will tell me how much liquid LP remains in the tanks! This is not rocket science, I can't believe there is no on-line calculator! My tanks each currently weigh 39.8 lbs, the tare weight is 23.5 lbs, the diff. is 16.3 lbs. I think LP is about 4.5 lbs per gallon...so...
16.3 / 4.5= 3.62 gallons of LP. I think a full 30# tank holds about 7.5 gallons of LP, so can I assume each tank is about 1/2 full?
An on-line calculator would eliminate all the above BS!

red31

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Posted: 10/05/09 09:54pm Link  |  Print  |  Notify Moderator

30 Lbs = 100 %
(39.8-23.5)/30 (*100) = 54 %

* This post was edited 10/05/09 10:02pm by red31 *

Deen

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Posted: 10/05/09 10:02pm Link  |  Print  |  Notify Moderator

camillit wrote:

I am very frustrated in researching the Internet and I am good at it. I have 2-30# LP tanks, nothing special. I am trying to find a simple on-line calculator that will tell me how much liquid LP remains in the tanks! This is not rocket science, I can't believe there is no on-line calculator! My tanks each currently weigh 39.8 lbs, the tare weight is 23.5 lbs, the diff. is 16.3 lbs. I think LP is about 4.5 lbs per gallon...so...
16.3 / 4.5= 3.62 gallons of LP. I think a full 30# tank holds about 7.5 gallons of LP, so can I assume each tank is about 1/2 full?
An on-line calculator would eliminate all the above BS!
Personally I find a $1.00 calculator from Dollar Tree to be much more useful, or you could build a spreradsheet in Excel to do it too. Even most cell phones have a calculator built in. It's just not high on people's to do list.
Propane weighs approx. 4.4#'s/gallon.

Maybe it's because I'm a retired engineer (now a webmaster) that short, simple calculations don't "bother" me like some people.

Ultralife

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Posted: 10/05/09 10:03pm Link  |  Print  |  Notify Moderator

Using your basic assumptions which are really close, make your own chart using excel. Quite simple to do.

I looked for a chart also. You can also use the old trick of pourning hot water down the side of the tank and find the frost line.


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time2roll

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Posted: 10/05/09 10:19pm Link  |  Print  |  Notify Moderator

30 pounds of propane weighs 30 pounds. (how is that for a formula)
Tare is 23.5 so full is 53.5

You have 39.8 less 23.5 (tare) is 16.3 pounds of propane.

30 pounds is full and you have 16.3 or just over 50%.

Forget gallons until you pay for the refill. When they add 7.1 gallons and charge $2.50 per gallon you pay $17.75 dollars.

* This post was edited 10/05/09 10:25pm by an administrator/moderator *


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Posted: 10/06/09 06:39am Link  |  Print  |  Notify Moderator

I wish that is all I had to worry about!

camillit

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Posted: 10/06/09 07:53am Link  |  Print  |  Notify Moderator

Thanks very much. In the future we are leaving PA to go to SC and wanted to know how much LP we had. I have a changeover regulator, and the black lever was flipped to one tank. I was waiting for the red indicator to show, it indicates the tank is empty that the lever was flipped to. Apparently the regulator is drawing from both tanks as they each weighed exactly the same. I will go back to my old fashioned way and keep one tank valve SHUT. Yes I will run out of gas, but at least I will KNOW when the one tank is empty, and then I can get it filled. Thanks again

time2roll

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Posted: 10/06/09 09:00am Link  |  Print  |  Notify Moderator

I would have a new regulator. Mine works fine with both open.
Besides if something is not working I want it fixed.

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Posted: 10/06/09 09:19am Link  |  Print  |  Notify Moderator

"A typical steel "30 pound" liquid propane tank weighs about 25-28 pounds empty.

Propane tank markings (on collar)

Propane weighs about 4.125 pounds per gallon and a "30 pound tank" will hold about 7.5 gallons so a full tank will weigh about 55 pounds or so."

Source

I suppose the weight of the valve assembly should be taken in to consideration for an accurate calculation.

Next time it's empty have it weighed before filling and after to be sure. Most propane filling stations still have the old scales that were required before the new valves were required.

Most all dealers now charge by the gallon so you will know exactly how much it holds. However, some dealers charge a flat rate even if the tank is partially filled. I avoid these places as sometimes, especially when cold weather is in the forecast, I have the tanks filled when not completely empty.

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Posted: 10/06/09 02:29pm Link  |  Print  |  Notify Moderator

I have a digital fish scale to weigh all the fish I catch. Since I am a lousy fisherman, the scale gets more use weighing propane tanks, at home and RVing, than weighing fish.

A suggested, I made a chart and keep it in the pouch with the scale. After a couple of fills and run-downs, it is really simple to use.


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