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Propane Tank for Portable Air?

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TMAC

03-09-2000 18:56:20




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I was given a gas grill propane tank that was converted to a portable air tank. I don't know the operating pressure of LP so I don't know the maximum pressure I can put in the tank. What is a safe limit?




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Mike S

03-16-2000 10:02:26




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 Re: Propane Tank for Portable Air? in reply to TMAC, 03-09-2000 18:56:20  
I built my compressor from a 34 gallon propane tank that came from a pickup truck. It is marked at 300psi operating pressure. I never can get more than 125 out of my 2hp compressor anyway. I would reckon they all must meet something like that range.



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Jerry B

03-10-2000 17:14:26




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 Re: Propane Tank for Portable Air? in reply to TMAC, 03-09-2000 18:56:20  
From the Matheson Gas Data Book:
Vapor Pressure vs Temperature for Propane:
70F: 109psig
100F: 170psig
120F: 225psig

From this, a propane tank is obviously safe to use as a portable air tank, so long as it is in GOOD condition-especially NO EXTERNAL RUST. As others have suggested in this thread, make certain the regulator, connections, hose, etc. are in good shape. I always treat any pressurized device with the greatest respect, but that's saying the obvious. Hope this helps.

Jerry

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Mike

03-10-2000 08:35:27




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 Re: Propane Tank for Portable Air? in reply to TMAC, 03-09-2000 18:56:20  
I don't know maximum PSI but I run mine up to 100-no problems so far. Local propane dealer told me pressure varies greatly with temp. when propane is in the tank-but he had no numbers.



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Wardner

03-10-2000 10:17:11




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 Re: Re: Propane Tank for Portable Air? in reply to Mike, 03-10-2000 08:35:27  
I cannot speak to the small tanks, but the larger stationary tanks have a working pressure of 250 lbs and are tested to 375 lbs. The burst pressure is around 1000 lbs. I would assume the smaller tanks have a similar rating. You need to check the bottom where the ring is welded for rust. The inside of the tank should be OK. Propane is non-corrosive.



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Don

03-18-2000 13:01:59




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 Re: Re: Re: Propane Tank for Portable Air? in reply to Wardner, 03-10-2000 10:17:11  
Having been in the service station business we needed an replacment air tank .This was in the early 80"s We used a propane tank .It smells like propane for a while each time you release the air . but it worked and held 175 lbs of air all we could get in.These tanks seem to have heaver steel than the air tanks you buy. But you must consider this .If anything goes wrong who's liable. ? and I''m sure you'll heard the story about the person who was repairing a flat tire (plugging it) that the customer had just put fix a flat into.
(I understand some of these earlier small cans used propane as an additive with air ) When he inserted the rasp to ream out the hole prior to the plug it caused a spark and you can guess the rest . It was a warning to service station personell.So be carefull be sure the tank is aired out

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MarkD

03-10-2000 11:04:32




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 Re: Re: Re: Propane Tank for Portable Air? in reply to Wardner, 03-10-2000 10:17:11  
with these home-made tanks, the weak point is more likely the gauge/fittings, not necessarily the tank itself... a PSI gauge implanted into one's forehead would not be particularly desirable!



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Tyler(WA)

03-10-2000 11:30:11




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 Re: Re: Re: Re: Propane Tank for Portable Air? in reply to MarkD, 03-10-2000 11:04:32  
I have a 3 gal. portable complressor that is nice for construction, like using a nailer for putting up a fence, but it's a pain to wait for my compressor to come back up to pressure when using my impact wrench to take off my tractor lugs.

An extra 5 gal. propane tank with one short flex line to a quick connect coupling on the tee of my compressor, would add a lot of capacity and serve me well.

Thanks for the tip.

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