If someone had a propane tank with LPG in it, what peak pressures would it see?
I'm looking to maybe use an LPG tank for a compressed air project and it might see pressures as high as 300-325 psi
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Aug. 30, 2011 2:41 p.m. curtis73 Dork
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Aug. 30, 2011 3:28 p.m. fastEddie SuperDork
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Aug. 30, 2011 4:40 p.m. Streetwiseguy Dork
If memory serves, at -36 the vapor pressure is zero. At 100C is about 200 psi.
But thats just a guess based on a class from 25 years ago.
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Aug. 30, 2011 5:06 p.m. curtis73 Dork
Good link. So I guess its fine for the pressure, but according to that site it might not be good for repeated fill and dump.
I'm building an air system for a car using an A/C compressor setup (air suspension, etc). I found an old CO2 tank that will work, but for its size (about 4 gallons) its really heavy and thick walled. The other benefit is that its aluminum so it won't rust. Its overkill, and it will work, but not the best. I was thinking it might be better to use a propane cylinder - more volume, but wondered if it would handle 300 psi.
Can you think of any other tanks in the 5-8 gallon range that would take 300 psi?
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Aug. 30, 2011 5:11 p.m. fasted58 Dork
1st in google but looks good
http://www.hornblasters.com/products/details.php?i=hornair-black-5g8p-air-tank
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Aug. 30, 2011 5:26 p.m. curtis73 Dork
yeah, that one says its burst-rated to 800 psi, but it also says not to use it over 200 psi or it could result in death.
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Aug. 30, 2011 6:45 p.m. fasted58 Dork
Yea I know, makes me wonder why the seller advertised as this tho:
The tank is rated to twice its stated working pressure and is capable of holding 300 PSI without problems. Better yet it meets all DOT specifications and is burst rated to 800 PSI.
Product liability/ lawyer speak? I dunno, I'd want more info
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Aug. 30, 2011 6:54 p.m. curtis73 Dork
Its going to be in the trunk mounted behind a bulkhead so I guess I don't care if it bursts from a shrapnel point of view, but I also don't want to be driving down the road and have a heart attack when the explosion happens and I'm suddenly riding on the frame at 80 mph
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Aug. 30, 2011 9:13 p.m. pete240z SuperDork
fasted58 wrote:
The tank is rated to twice its stated working pressure and is capable of holding 300 PSI without problems. Better yet it meets all DOT specifications and is burst rated to 800 PSI.
Product liability/ lawyer speak? I dunno, I'd want more info
In the "hose world" (air, hydraulic, industrial, and metal hose); everything is rated with a 4:1 safety factor. They design and pressure the hose, blow the hose up, note the burst pressure, and then divide by 4.
So a hose designed for a 300psi working pressure will rupture at 1,200psi. My standard lame sales joke is that you don't really want a hose that will burst at 305psi; would you?
