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DIY Scuba Tank (breath underwater) Answered

I need some advice. I have a great idea that would be amazing if it worked. I want a small scuba/air tank whatever you want to call it (like a scuba secondary tank or a paintball co2 tank) that i can use to mess around with in a pool. I dont want to be constantly breathing, just enough to take a deep breath, go underwater and hold it for a minute, release air from the tank-take a breath, hold it, take another breath from the tank, hold it, and so on. Just enough to get a few breaths and be under water to last me for 5 or 10 minutes. The only thing is i dont want to have to fill it at a dive shop or from a tank that has to be filled at a dive shop like scuba secondary tanks. i want to rig it to fit a bike pump (which probably will not have enough psi to get the amount of air i want) or my air compressor. So i would like advice and also would i need an air regulator since im not constantly breathing? what could i use as a regulator if i need one at all? 

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Phantom OfT

20 days ago

Even thou this is a really old thread, I want to warn anyone
that wants to try this......



DON’T; you will die!

There is a reason why we go and take Diving Lessons.

The air in diving tanks is filtered and has special non-petroleum oil, used in
the air compressor. So please be careful. And if you want to use Diving Gear Go
take lessons.

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Jake_Makes

22 days ago

You'd need a regulator or something at the release to control the amount of air fired into your mouth. Thats the main thing. I think if you used a bike pump the air would definitely be clean enough to not bother you, especially for something like this that you would only use once in a very long while. If in doubt, a coffee filter stuck somewhere in the line would get rid of 90% of whatever trace amounts of dust or oil would be in the air. I've actually wanted to do this for a long while, but we got rid of our pool last year so i'm out of luck.

I don't think this is dangerous if you take some precautions and understand the forces involved. DO NOT underestimate the air pressure you will be using. As the others have said, yes it absolutely will kill you. 100 psi is enough to put a blowdart through an inch of plywood and fire a toilet paper wad at the speed of a paintball. If you release that kind of pressure into your mouth you are dead. So yeah, regulator is imperative. I'd look for a co2 paintball regulator. I bought one that adjusts from 0 to 500 psi. It would also attach right onto a co2 canister, so it should be perfect. Do some tests though before sticking it to your mouth as I haven't used it yet so don't know exactly how it will perform. You shouldn't need an exit valve for the spent air, just breathe it out your nose. If you find you do, a flap of inner tube attached at one point to outside of the mouthpiece over a small hole should do it. When you breath out it will open, and when the pressure is gone the water pressure will instantly force it shut to keep anything from coming in until you breathe out again. Good luck!

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rickharrisJake_Makes

Reply 21 days ago

To breath underwater you need a DEMAND regulator. Not just something to lower the presure.

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Jake_Makesrickharris

Reply 21 days ago

Not if you just want to mess around in the backyard pool. A blowgun valve you can manually press when you want to breath will work fine.

btw, I just realized this thread was started 4 years ago. Lol, how'd it get back to the top?

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Downunder35m

5 weeks ago

There is a reason for all these laws and regulation in regards to breathable air tank supplies and the related equippment.
They all were made after too many people tried what you want to try.
It all sounds fun and easy but if things can go wrong then they do, sooner rather then later.

In theory I would have no problems at all making my own low tech scuba gear.
Quite easy actually as I have all required parts at hand.
Still I would not even try it.....

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Yonatan24

5 weeks ago

Check out Rulof Maker's channel on Youtube, he has a few interesting projects.

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Brian M V

5 weeks ago

as a dive instructor i urge you to read, heave and listen to rickharris' post.
The most important things are to regulate the pressure and have clean air!

maybe less cool and spy-y but why not just mount an airtube (gardenhose or something) on a floater, if its just about staying underwater...

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rickharris

6 weeks ago

NOTE: what you plan, even in a pool is very dangerous lots of people have died using home made underwater breathing systems
Some simple facts - 1. The average adult lung capacity is 6 ltrs. That's 1 breath.
2. You must separate the outgoing Co2 from the incoming fresh air.
3 You will need a demand valve. this supplies air on demand at a pressure regulated by the water pressure.
4. Work out how much air your tank will hold, You can only use that down to the pressure of the water around you.
SO if your tank holds 1 ltr and you fill it with a pump to 178 bar (that's possible for pumped air rifles) - You have roughly 178 ltrs available to you to breath 178/6 = 29 breaths. You should halve that for practical purposes so about 15 breaths.

A LOT of effort for very little return. DON'T use a standard air compressor the air you breath has to be clean and pure.
DON'T try this without a certified demand valve. Inflating your lungs with 178 bar air WILL kill you.
Better still Don't try this at all.

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CarolineL1

6 weeks ago

This guy has done exactly what you have described:

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SouthernAtHeart

7 months ago

I used an air compressor, set the pressure valve to the lowest setting, hooked up a long garden hose, and stayed under for 15 minutes.

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bravoechonovember1

3 years ago

tank if you do make this DO NOT USE AN AIR COMPRESSOR it will put oil and dust in the air tank