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Propane pressure?

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HiK

01-16-2001 10:56:59




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does anyone know what the pressure of propane in a cylinder? Want to use an old aluminum propane cyl for a compressor tank...good idea?




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Wardner

01-17-2001 01:11:33




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 Re: propane pressure? in reply to HiK, 01-16-2001 10:56:59  
Propane tanks make fine air receivers. Propane is a "sweet gas" which means it is non corosive. The inside of a propane tank just taken out of service will look like it has just been fabricated. The bigger tanks, and I assume the small ones as well, are rated for a working pressure (wp) of 250 psi. I have a 1000 gal tank that I have used as a truck mounted sandblaster since 1972. It holds nearly 7 tons of sand. It has cycled more than 6000 times between 0 and 125 psi while I have owned it. I bought it used off the local gas company.

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Wardner

01-17-2001 01:44:13




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 Re: Re: propane pressure? in reply to Wardner, 01-17-2001 01:11:33  
HiK, just re-read you original post and picked up the work "aluminum". That is a metal that got a bad reputation about 15 years ago for use in a pressure vessel. The cryogenic industry had to abandon over time the use of all their dewars (tanks) that used an aluminum inner vessel (pressure inside and vacuum outside) in favor of stainless steel and 9% nickle steel. I believe the reason was that aluminum work hardens more quickly than the other materials. Pressure cycling can work harden metal. If I were you I would do some research on this before using that tank.

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JerryB

01-16-2001 16:38:49




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 Re: propane pressure? in reply to HiK, 01-16-2001 10:56:59  
The (vapor) pressure of propane is highly dependent on temperature. The Matheson Gas Data Book shows:

37psia @ 0 degrees F
130psia @ 75 Degrees F
255psia @ 125 Degrees F
600psia @ 205 Degrees F
Note: psia=absolute pressure; add 14.7 for gauge pressure.

If you are asking what pressure propane tanks are rated for, the ASME code specifies 3000psig for most applications.

This is obviously plenty for an air tank (receiver). You should NEVER use a non-refillable propane cylinder for this type of service. They are not designed nor built for pressure cycling.

A propane tank in good condition makes a fine (but heavy) air receiver. Just make sure the tank and all fittings are in good condition and that the appropriate safety appliances are installed.

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Skinner

01-17-2001 04:18:15




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 Re: Re: propane pressure? in reply to JerryB, 01-16-2001 16:38:49  
Jerry, you add 14.7 to convert gauge pressure to absolute so you would subtract 14.7 to make abs to gauge.



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JerryB

01-17-2001 11:20:29




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 Re: Re: Re: propane pressure? in reply to Skinner, 01-17-2001 04:18:15  
Absolutely. I guess I meant the other addition!! LOL.

Thanks for the correction.

JerryB



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John in MA

01-16-2001 16:22:47




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 Re: propane pressure? in reply to HiK, 01-16-2001 10:56:59  
This questiosn was asked last year with mostly negative responses. It is NOT a good idea to keep air a tank used to store flammable gas. This is just my take on it. I'm very happy with all my parts where they are.

I'd say it's safe to use a new virgin propane tank, or a big one that's been steamed out, but nothing else.



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ltf in nc

01-16-2001 13:56:43




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 Re: propane pressure? in reply to HiK, 01-16-2001 10:56:59  
This is an area not to compromise by substituting a nonqualifying vessel. Never use a well tank nor a non rated tank for this purpose. You only have one sound body and life in this world. Where do you live? I may be able to help you have an approved tank. Ask around at stores that sell compressors to see if you can buy one that has had a compressor failure and salvage the tank. Go to the recycling yards and you may locate an approved tank on a junked machine. Try to get a tank with an ASME rating.

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micheal

01-16-2001 12:28:02




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 Re: propane pressure? in reply to HiK, 01-16-2001 10:56:59  
propane is about 125# - 150# in the tank. Usually proofed to 225#. should work fine for an air tank.

micheal



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Don't put the lawyers on me

01-16-2001 16:35:26




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 Re: Re: propane pressure? in reply to micheal, 01-16-2001 12:28:02  
Propane leaves no residue in the tank. Vent it well for a day, put 75 PSI air in it and let it out quickly. Do this a couple of times and there will be no fumes left. I have welded on them after this procedure, no problem. A while back, there were several posts on how to test a tank. Experience has shown me that propane tanks handle 175 PSI just fine.



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