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Old 29-06-2009, 13:24   #1
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Galvanized Propane Tanks

I have 2 painted steel propane tanks on Minggat. They are basically standard the BBQ sized diameter, but shorter. I have no idea what they are in pounds, but they hold 2.1 gallons each.

They are set in brackets I had made for them that sit outside of my coaming.

The point of all this is, I knew when I did this set up that I would someday want galvanized tanks. That time has come. But the propane outfit I bought the painted steel tanks from did not know that galvanized tanks even existed. So who makes stubby galvanized tanks that are the same diameter as the standard bottles. Sorry to be so vague. The boat is in Mexico and I am not.
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Old 29-06-2009, 13:35   #2
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never seen a galvanized propane tank.......
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Old 29-06-2009, 13:49   #3
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I had aluminum
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Old 29-06-2009, 13:55   #4
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Aluminum or composite but no galvanized.
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Old 29-06-2009, 14:25   #5
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An aluminum tank with a bit of corrosion on it can look galvanized. The best way to tell is probably weight. An aluminum tank would be significantly lighter than galvanized steel.
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Old 29-06-2009, 14:26   #6
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You should probably look at the new fiberglass tanks. They are non rusting, lighter and cheaper than the aluminum, and you can see the propane level in them. They come with the new no overfill valve, and have a longer re-certifiable life than the steel tanks. They cost a little more than the steel tanks but I don't know how the price compares with Galvanized tanks.
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Old 29-06-2009, 14:28   #7
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Quote:
Originally Posted by Minggat View Post
I have no idea what they are in pounds, but they hold 2.1 gallons each...
Since liquid propane is about 4.2 pounds per gallon, your tank would be approximately 9.24# - or 10 pounds “nominal”.

The most accurate way to measure the propane in a propane tank is to weigh it. Stamped into the side of the tank should be the letters TW followed by a number. This number is the weight in pounds of the tank when empty, or its tare weight.
To fill the tank properly, the dealer must calculate the maximum safe fill from the Water Content (WC) value stamped on the tank. The maximum amount of propane that can be placed in the tank is 42% of the WC value.
When filling your cylinder with a scale, the attendant will attach a nozzle to your cylinder. The weight of this nozzle must be accounted for, or, unless they are charging a flat rate, you will be paying for it!

See also, an earlier discussion at:
Propane cylinders
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Old 29-06-2009, 15:08   #8
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I bought 20 lb galvanized tanks in Australia. They were the same diameter as the American steel tanks, but the top valve protector was about half an inch higher, and had to be cut down to fit. They have lasted over 10 years and look fine, but I would probably look into the new fiberglass tanks if I had to replace them.
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Old 29-06-2009, 17:22   #9
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New composite tanks are not the same diameter. I looked into them some time ago.

I have seen small galvanized tanks before and therefore thought they were more common. A former dockmate had them on his cat a few years ago. Somebody out there sells them.
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Old 29-06-2009, 20:11   #10
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I have had steel LPG tanks galvanised, you first have to remove the valve and have the tank sandblasted, then take them to your galvaniser, He has to screw a suitably threaded pipe into the Valve hole, it has to be long enough not be submerged into the zinc bath, this allows the tank to breathe and not get Zinc inside. Once the galvanising is completed the pipe is removed, the valve refitted and the tank pressure tested and stamped with the testing date. Mine are at least 10 years old and are as good as new.
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Old 30-06-2009, 12:48   #11
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Why risk steel tanks at all? Several places I know in my area that will not fill steel tanks if they came from a boat. Too great of a hard to see corrosion problem.

However, I also know places that will not fill the new composite fiberglass tanks which was a surprise to me as I was about to pick up one as a replacement/ back up to my Aluminum tanks now in use.
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Old 30-06-2009, 18:49   #12
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Our boat came from S. Africa w/ galvanised tanks . Fittings different though.
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