GTA
All Springer/NP/PCP Air Gun Discussion General => "Bob and Lloyds Workshop" => Topic started by: Blutroop on February 18, 2022, 01:28:25 AM
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I found a 95g aluminum cartridge threaded 5/8x18 with dot markings and knew I would end up using one for a build eventually. It lists a burst pressure of 4800 and a test pressure of 3000. It is sold by fluval for aquariums.
Does test pressure usually correspond with yield pressure?
How does one figure a pressure limit? How much yield is too much?
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Would need to know wall thickness and diameter to give an definitive answer.
If they have a 4800 burst that puts you at a 2:1 safety margin if regulated at 2400, or 2.4:1 at 2000 psi, which is a bit under the recommended 3.5:1 safety margin for burst pressure.
Would need to regulate down to 1400-1600 to by safe by most standards (between 3:1 and 3.5:1)
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I found a 95g aluminum cartridge threaded 5/8x18 with dot markings and knew I would end up using one for a build eventually. It lists a burst pressure of 4800 and a test pressure of 3000. It is sold by fluval for aquariums.
Does test pressure usually correspond with yield pressure?
How does one figure a pressure limit? How much yield is too much?
Never seen an aquarium air system run off HPA, pretty sure that tank is designed for CO2 use.
You say it is "DOT" so there should be a DOT # on it. Do a search on that DOT #.
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sounds like the 88 gram is much stronger.. those have a yield in the realm of 7800.
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Jeremy
Just in case you may have missed it, here are some spec's for several different sizes/types of Co2 cylinders,
http://www.lelandltd.com/disposable_gas_cyl.htm (http://www.lelandltd.com/disposable_gas_cyl.htm)
Lots of good info, I have my mechanic friend looking for the vehicle Co2 cylinder............... ;)
Hth's
Don
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Thanks for the replies. I知 fine sticking around disco pressures as I知 kinda going for a lightweight build. I知 planning on doing something kinda like bobs disco pumper or a air conserving pumper/pcp hybrid. I知 gonna use a aluminum pump tube into a mono block and if I end up wanting higher pressures I will use a aluminum 13ci tank that can handle 3000 instead of these 95g tanks. I should be able to be my own regulator as long as I知 still hand pumping and have a gauge installed.
If it wasn稚 such a bad winter for me I壇 just buy a 362 to tinker and hunt with, as my few remaining assets are still frozen, literally. As of right now though I知 loosing the battle of having a functioning air rifle.
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Don, I was curious about that vehicle tank too. If you find any more info or what manufacturer uses it I壇 like to know.
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The ASME uses a 3.5:1 safety margin to failure.... That would mean (4800 / 3.5) = 1370 psi MSWP.... However, test pressures are usually 5/3 of the MSWP, which would give (3000 x 3/5) = 1800 psi, which is exactly the working pressure I have seen on any CO2 bottle I have purchased.... They are fitted with a 3K burst disc to match the 3000 psi test pressure.... Personally, if I was using this for regulated HPA, I would make sure the regulator had a 1.8K burst disc, and then run it at a low enough pressure that it doesn't pop.... That means about 1400 psi, maybe 1500.... Few 1.8K burst discs will survive 1600 psi over any period of time (and some will pop on the first fill at 1500 or more)....
Bob
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Jeremy
Will do,
Don
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The tiny cylinders listed in #7 at the bottom of table 2, look like they would be perfect for a tiny airgun.
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Are you talking about the ones "as small as a pencil eraser" ?.... only 1.5 cc?.... Tiny indeed!....
Bob