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Compressed air in freon cylinders?

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John in MA

02-19-2001 12:04:31

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I've heard all the dangers associated with using flammible gas cylinders for compressed air, but what about 50 lb. freon cans? I have a few empty "disposable" freon and helium containers that look like they'd make good portable air tanks. What pressures are freon and helium stored at in these things? Also, anybody know what pressure the blow out plugs will blow at?

I just wake to make sure I don't end up in the Darwin awards.

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John Reynolds

02-19-2001 22:12:19

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Re: Compressed air in freon cylinders? in reply to John in MA, 02-19-2001 12:04:31

Thanks for the info! Any idea what the rupture disk is set for on helium?

Pipe fitting time... Err, I won't tell if you don't.

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T_Bone

02-19-2001 20:37:00

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Re: Compressed air in freon cylinders? in reply to John in MA, 02-19-2001 12:04:31

Hi John, By law you can't reuse refrigerant containers for anything. Freon is a Dupont trade name.

Now we got that out of the way, I've used R-22 cylinders for about 15yrs without any problems. The rupture disc is set at 240psi for R12 R134-A and R22 at 450psi, R500 R502 at 600psi and is the disc about the size of a quarter just left of the schrader valve(the main valve). Once they rupture you thow them away. No don't try and weld them!!! PERIOD! In 20yrs I've had only one rupture full of $500 refrigerant. Do not use any other type of refrigerent containers because of the chemical mixtures in other containers. There is no refrigerant containers set to repture at 120lbs or 160lbs.

T_Bone

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Franz

02-19-2001 17:19:40

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Re: Compressed air in freon cylinders? in reply to John in MA, 02-19-2001 12:04:31

There were kits for doing just this till some government do gooder got in the act and decided it was a NoNo.
Freon cylinders work well for portable air tanks, I've been doing it for over 20 years. Look around for one of the valve manifolds that screw directly onto the freon valve, they also have a hose port & a safety valve set at 120#. By the time they become rusted on the inside, somebody usually steals it anyhow.

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JoeK-still available freon/lp conv

02-21-2001 10:36:31

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Re: Re: Compressed air in freon cylinders? in reply to Franz, 02-19-2001 17:19:40

I just bought one of these to convert an LP bottle,which had the old POL fitting about to be phased out for the new OPD LP valving setup.

Milton air

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Al English

02-19-2001 12:36:17

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Re: Compressed air in freon cylinders? in reply to John in MA, 02-19-2001 12:04:31

Hi John, Freon containers are pretty light wall, and are not designed for repeated use. I've heard it's actually illegal to re-use them, but I'm not sure that's true. I have two I use as portable tire inflators. I've used them a lot for at least 10 years, and I'm concerned every time I re-fill them. In the near future they will be replaced with an "official" portable air tank. The relief valves on my tanks open at around 145PSI. Best advice based on what I know is don't use them. Good luck...Al English

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Tom R

02-19-2001 12:34:07

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Re: Compressed air in freon cylinders? in reply to John in MA, 02-19-2001 12:04:31

I don't know about the helium containers but it is against DOT regulations to use the refrigerant containers. The inside of the refrigerant vessels are not coated or painted since refrigerant is dry (contains no moisture) the inside does not rust out but compressed air is very wet so rust will begin immediately when you use it for compressed air. Any refrigerant container made in the last few years will have a built in check valve so that refrigerant can be withdrawn but not put back into the container. I suspect that this is also true of helium.
Tom R

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