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Old 12-08-2013, 04:18 PM   #1
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Propane tank size????

Ok guys when I got my airstream it only had one original tank. I got another pair on Craig's but there smaller. What size is the big one and what size is the small pair? Thanks
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Old 12-08-2013, 04:23 PM   #2
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The small one is a referred to as a 20 lb.

The pair are 30 lb.

The large one is a 40 lb.

They should all be near the same diameter.





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Old 12-08-2013, 04:54 PM   #3
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I can't tell for sure from the photo, but the one 30 lb cylinder looks like it might have a non-OPD valve. You can tell the difference by looking at the shape of the valve.

OPD valves have a more triangle-shaped handle, like this one:



Non-OPD valves will have a different shape, often more like a star:



If your cylinders do not have OPD valves, then you should have them replaced; otherwise, you may have a tough time finding places to fill your cylinders. Take them to a full-service propane company to have it done. They'll order new valves to fit (based on the "DT" value on marked on the collar of the cylinder). Have the cylinders recertified at the same time if they need it.


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Old 12-08-2013, 05:13 PM   #4
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About used (or older) vertical LPG tanks: There is a manufacture date stamped into the collar on the tank. The tank can be refilled for 12 years from that date, then the tank must be recertified before it can be legally refilled. The cost and process varies between localities. In 2002, an additional requirement became law for an OPD valve to be installed on the tank before it could be refilled. The OPD valves have a unique 3 lobed non-removable handle that has OPD embossed on it and OPD is also embossed on the brass valve body. The old style valves can be replaced. Shop around as with many things, prices can vary.
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Old 12-08-2013, 07:06 PM   #5
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Thanks for the input guys. I would trade the pair a just bought for one of the taller ones so I have a pair of the bigger ones. If anybody knows of one somewhere.
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Old 12-10-2013, 09:41 PM   #6
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The 40# ones are unusual because they were only available as a (rarely ordered) option until fairly recently (late 1990s? not sure), when they became standard on some of the longer trailers.

You can get new ones from Vintage Trailer Supply and many other sources. They are expensive, especially the aluminum ones.
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Old 12-11-2013, 04:03 AM   #7
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Jammer

Thanks for the info. I don't like that word "expensive" but it and airstream seem to go hand in hand. Lol.
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Old 12-11-2013, 04:51 AM   #8
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I don't really consider the aluminum tanks expensive, it is one of those "you get what you pay for" situations. They will last a lifetime if you take decent care of them and still be looking good if you do.

FWIW my AS came with twin 30# and I have a set of 40# to use on it too.

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Old 12-11-2013, 05:24 AM   #9
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True. I love mine and I haven't even started the restore yet lol
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Old 12-11-2013, 05:38 AM   #10
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If you ever want to put a tank cover on them they are easier to find used for the 30lb. tanks than the 40 . I found a used 30lb. tank at a propane dealer here in Toledo . You may find what you are looking for if you check some dealers in your area .
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Old 12-11-2013, 06:07 AM   #11
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Keep in mind that many of the older aluminum tanks have a nice level gage on them but if you upgrade to an OPD valve you loose this level gage which in my mind is a much better safety feature than the idiot OPD valve. You can get new tanks from VTS that has two bungs in them. One for the level gage and another for the OPD valve. This is expensive but I like having the level gage. If you have the older tanks, you will have to loose the level gage to put the new OPD valves on. An aluminum tanks saves you about 7lbs in weight. The steel ones work fine if you have them behind a shroud.

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Old 12-11-2013, 09:06 AM   #12
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You know, if you do add equipment (e.g., a level measurement device) to a cylinder, it might not be a bad idea to inform your propane filler about it. Carefully weigh the new equipment before installing it, and then provide that additional weight to the filler.

Lynn

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Originally Posted by perryg114 View Post
Keep in mind that many of the older aluminum tanks have a nice level gage on them but if you upgrade to an OPD valve you loose this level gage which in my mind is a much better safety feature than the idiot OPD valve. You can get new tanks from VTS that has two bungs in them. One for the level gage and another for the OPD valve. This is expensive but I like having the level gage. If you have the older tanks, you will have to loose the level gage to put the new OPD valves on. An aluminum tanks saves you about 7lbs in weight. The steel ones work fine if you have them behind a shroud.

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Old 12-11-2013, 10:08 AM   #13
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I have a pair of 30s which is quite adequate for the amount of gas we use. 30 lbs equate to 25 lbs empty and 55 full. If you find it inconvenient to take your trailer in to refill and need to just take the tanks......55 lbs can be heavy to lift....I cannot imagine what the 40 weighs full.
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Old 12-11-2013, 12:34 PM   #14
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Since the 40 pound tanks have 10 more pounds of propane than the 30 pound tanks and the aluminum tanks are 7 pounds lighter than the steel tanks, it appears the loaded aluminum tanks are about 3 pounds heavier than the steel tanks.
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