Underwater breathing apparatus?

[RICKYtan]

How to make changing depths irrelevant for breathing in a small submarine or other manned underwater vehicle; in terms of the under breathing apparatus or system ?

 

[berkeman]

How to make changing depths irrelevant for breathing in a small submarine or other manned underwater vehicle; in terms of the under breathing apparatus or system ?

Make the sides of the submarine rigid, like pretty much all submarines.

 

[DS2C]

Not sure what your'e asking, but subs are pressurized to 1 ATA, regardless of their depth. Their depth restrictions are structural.

 

[Gigaz]

What you need is Liquid breathing. It's not used widely.
https://en.wikipedia.org/wiki/Liquid_breathing

 

[CWatters]

How to make changing depths irrelevant for breathing in a small submarine or other manned underwater vehicle; in terms of the under breathing apparatus or system ?

Good description of the problem you have without a rigid sub...

http://www.bishopmuseum.org/research/treks/palautz97/phys.html

 

[jim hardy]

Jacques Cousteau who developed the Aqua-Lung,
figured out his pressure regulator needed to be adjacent his chest so that regardless if he were upside down or right side up or level , the regulator is at the same depth as the lungs. When it's not it makes air at the wrong pressure for breathing.

27 inches of water is a psi of pressure.
2 psi is enough to distend your lungs 10% and kill you, look up 'Pulmonary Barotrauma and Scuba Diving'. It can happen is a swimming pool.

So if this is something you're building at home go out and get some scuba training.

I read all of Cousteau's early books in the 1950's when i was in grade school. If underwater is your hobby you might enjoy them as history written by a pioneer in the field..

 

[DS2C]

Will second that. I've seen an arterial gas embolism in a 6 ft swimming pool. If you want to tinker with breathing compressed gas under pressure, know what youre doing.

 

[jim hardy]

Will second that. I've seen an arterial gas embolism in a 6 ft swimming pool.

Yes.
When kids duct-tape dad's paint sprayer to a garden hose and jump in the pool tragedy has just got a dual invitation - electrocution.and burst lung sacs

If you have kids don't let them do that.

I did it and was lucky but at every chest X-ray they ask me " Why are your lungs all scarred up? Were you a coal miner years ago? "
It's a very real danger.

old jim