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Old 09-12-2010, 10:30 PM   #1
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LP Gas facts.......

Just completed our 3200 mile shakedown cruise in our 1970 A/S 27' International.
Learned two things about our LP tanks, I have two bottles both about 7.5Gal
I ran the refrigerator for two solid weeks one one tank alone, pretty respectable, that was on the coldest setting as we were in So Cal the bulk of the trip. While filling the tanks in Shasta, Ca. I asked the LP man how to tell how full your tanks were, he told me to pour some hot water over the tank from top to bottom, it will freeze where the gas level is. I didn't get to do this yet. Has anybody ever heard of this before???
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Old 09-12-2010, 11:07 PM   #2
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I don't think it'll freeze unless the ambient temperature is already pretty low, but this is basically the principle behind the stick-on propane tank level indicators. A temperature-sensitive strip runs vertically up the tank... you pour hot water on it, and after a moment the part of it that is below the level of the LP inside the tank cools and changes color, while the part that's above the level in the tank stays warm.
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Old 09-12-2010, 11:07 PM   #3
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Yep, the water won't freeze, but the tank will be noticeably cooler below the liquid propane level.

Bill

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Originally Posted by howco View Post
Just completed our 3200 mile shakedown cruise in our 1970 A/S 27' International.
Learned two things about our LP tanks, I have two bottles both about 7.5Gal
I ran the refrigerator for two solid weeks one one tank alone, pretty respectable, that was on the coldest setting as we were in So Cal the bulk of the trip. While filling the tanks in Shasta, Ca. I asked the LP man how to tell how full your tanks were, he told me to pour some hot water over the tank from top to bottom, it will freeze where the gas level is. I didn't get to do this yet. Has anybody ever heard of this before???
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Old 09-13-2010, 05:30 AM   #4
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lp gas tank

just like yesterday....in my mind,,,i prevision the thank that is about to be empty, and like yesterday when cooking and the burner goes out...then you know the tank is empty
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Old 09-14-2010, 12:59 PM   #5
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Thanks King
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Old 09-14-2010, 02:47 PM   #6
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There are a couple of variables here, but, yes, water can freeze on the exterior surface of tanks if the ambient pressure inside the tank is just right, allowing the propane to boil readily.

But this method is strictly for the novice. It is not permissible for licensed fillers to use anything like this method. The National Fire Protection Association (NFPA 58, Liquefied Petroleum Gas Code) recognizes two methods (filling by volume, filling by weight), though some states may prefer one over the other. (NM requires filling by weight if possible.)

For the novice, you can determine empty and full by math applied to markings on your cylinder:

WC XXX -- This is the water capacity in pounds for your cylinder. Multiply it by .42 to reveal the pounds of propane that your cylinder can contain when full.

TW XXX -- This is the weight of your cylinder when completely empty (essentially, the weight of the metal).

So if you have a cylinder that can contain, say, 29.97 pounds of propane, and the cylinder weighs in at, say, 25 pounds, then the following obtain:

1. If you weigh this cylinder, and it's at 25 pounds, then it's dead empty.

2. If you weigh this cylinder, and it's close to 55 pounds, then it's full.

You can figure for yourself what intermediate weights indicate.


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Old 09-14-2010, 04:05 PM   #7
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If you have the auto change-over valve in place and it is operating correctly, my method is to leave the second tank turned off and burn the selected tank until empty. I then switch manually and get the empty filled.

Yes, I do have to restart everything, but that is much easier than being out of propane completely.

To anwser you question, yes pouring water down the side will safely indicate the liquid level, and give you an idea how much propane remains. Keep in mind, it will appear the tank is not full via this method, even when you just had it filled.
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Old 09-14-2010, 04:11 PM   #8
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Up here, the fill-up places I see have stickers on the equipment saying that by law they are prohibited from filling the tanks to more 80% of their capacity.

It still costs me $25 to get gas in an empty tank though. I offered to give him 80% of that, and he looked at me like I was crazy!

The nerve!

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Originally Posted by eubank View Post
There are a couple of variables here, but, yes, water can freeze on the exterior surface of tanks if the ambient pressure inside the tank is just right, allowing the propane to boil readily.

But this method is strictly for the novice. It is not permissible for licensed fillers to use anything like this method. The National Fire Protection Association (NFPA 58, Liquefied Petroleum Gas Code) recognizes two methods (filling by volume, filling by weight), though some states may prefer one over the other. (NM requires filling by weight if possible.)

For the novice, you can determine empty and full by math applied to markings on your cylinder:

WC XXX -- This is the water capacity in pounds for your cylinder. Multiply it by .42 to reveal the pounds of propane that your cylinder can contain when full.

TW XXX -- This is the weight of your cylinder when completely empty (essentially, the weight of the metal).

So if you have a cylinder that can contain, say, 29.97 pounds of propane, and the cylinder weighs in at, say, 25 pounds, then the following obtain:

1. If you weigh this cylinder, and it's at 25 pounds, then it's dead empty.

2. If you weigh this cylinder, and it's close to 55 pounds, then it's full.

You can figure for yourself what intermediate weights indicate.


Lynn
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Old 09-14-2010, 05:11 PM   #9
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Quote:
Originally Posted by Aage View Post
Up here, the fill-up places I see have stickers on the equipment saying that by law they are prohibited from filling the tanks to more 80% of their capacity.

It still costs me $25 to get gas in an empty tank though. I offered to give him 80% of that, and he looked at me like I was crazy!

The nerve!
Yes, that's correct. The WC figure stamped into the collar of your cylinder takes the 80% fill margin into account.


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