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Oxygen tank

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Oxygen tank

Unread postAuthor: Haniball1337 » Sun Jun 16, 2019 1:21 am

Hi guys, i want to build air tank for my air rifle and i found olx oxygen tanks. They are from 1980 i think, and they are all little rusted not much . I'd like to pump it something about 100 bar, it will be safe to put that pressure in this tanks?
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Screenshot_2019-06-16 Stara butla na tlen.png
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Re: Oxygen tank

Unread postAuthor: jrrdw » Sun Jun 16, 2019 4:17 am

Depends on how badly they are rusted. I would fill the tank and a barrel with water and hydro test them. That's probably the safest way in the back yard.
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Re: Oxygen tank

Unread postAuthor: jackssmirkingrevenge » Mon Jun 17, 2019 5:28 am

Haniball1337 wrote:I'd like to pump it something about 100 bar


What are they rated for? If I'm not mistaken Oxygen is typically run at around 170 bar. As jrrdw suggested, a hydrotest using fluid would not be a bad idea, not just for the tanks but for the rest of the setup, don't forget that your system is only as strong as your weakest fitting.

Here's a dude doing a DIY hydrotest, you can find similar guides online:

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Re: Oxygen tank

Unread postAuthor: Haniball1337 » Mon Jun 17, 2019 5:43 am

They are medical oxygen tank
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Re: Oxygen tank

Unread postAuthor: jackssmirkingrevenge » Mon Jun 17, 2019 5:49 am

There should be a pressure rating written somewhere around the neck.

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Re: Oxygen tank

Unread postAuthor: Haniball1337 » Wed Jun 26, 2019 10:13 am

i think this is they rating and inside i dont see any rust its clear but another one have little rust. So can I fill one to about 200 bar or even this 250? they are really heavy
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Re: Oxygen tank

Unread postAuthor: D_Hall » Thu Jun 27, 2019 12:55 am

Haniball1337 wrote:i think this is they rating and inside i dont see any rust its clear but another one have little rust. So can I fill one to about 200 bar or even this 250? they are really heavy


Looks like 250 is the rating but I'd be a bit leary if the rust is anything other than cosmetic. Do you know the history of the bottles?
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Re: Oxygen tank

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Re: Oxygen tank

Unread postAuthor: Haniball1337 » Thu Jun 27, 2019 2:17 am

I only know they are from 1980 and they was using in medical ambulance. 1 bottle i think is in very good condition
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Re: Oxygen tank

Unread postAuthor: D_Hall » Fri Jun 28, 2019 4:54 pm

Haniball1337 wrote:I only know they are from 1980 and they was using in medical ambulance. 1 bottle i think is in very good condition

1980 is no big deal. In the compressed gas world, that's practically new! The question is how they've been stored and such. Again, rust is a concern. If they've been stored in a cool, dry place and just happen to have some cosmetic (read: surface) rust? No big deal. If they were pulled up from the bottom of a Florida swamp, on the other hand....
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Re: Oxygen tank

Unread postAuthor: Haniball1337 » Mon Jul 01, 2019 7:10 am

I think 1 bottle was using in underground mining safety equipment. They was stored in a dry and warm room. Yeah, i have another problem. I can't find any thread that will be compatible. I tried 1/2 and 3/8 and 1/2 is little big for it , and 3/8 is screwing on but only at end of bottle thread, i think its tapered thread. How can I find out thread of this bottle? I was looking at bottle but there is many numbers.
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Re: Oxygen tank

Unread postAuthor: Haniball1337 » Tue Jul 02, 2019 9:59 am

Will 3/8 tapered thread nipple be compatible with bottle? or something different? i tried 1/2 tapered thread pipe and it screw but only 2 (tooths?)
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Re: Oxygen tank

Unread postAuthor: farcticox1 » Tue Jul 02, 2019 6:29 pm

Might be NPT vs BSP :?: although 1/2" is pretty close, both 14 TPI


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Re: Oxygen tank

Unread postAuthor: Haniball1337 » Wed Jul 03, 2019 10:11 am

So i need to buy NPT thread reduction or BSP Thread right?
I found NPT 3000 psi nipple it has NTP thread, and i found G1/2'' x 3/8 reduction nipple and it has GZ BSPT 1/2' x GZ BSPT 3/8'' thread. Both nipples are 3/8 threads. Or i need 1/2? .Will this do a job?
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Re: Oxygen tank

Unread postAuthor: mrfoo » Wed Jul 03, 2019 2:56 pm

No, what you need is one of these

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Re: Oxygen tank

Unread postAuthor: Haniball1337 » Wed Jul 03, 2019 4:01 pm

Will this be good?
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