But it doesn't actually happen because of the non-return valve that is always mounted on the hat.
That's what I figured. I also would expect that the hose would collapse before a human would get sucked through it.
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But it doesn't actually happen because of the non-return valve that is always mounted on the hat.
The non return valve is checked before attaching a hat to a life line. (umbilical)
If there is not a non return valve on the hat, and the pressure in the hose is not equal to or greater than abient pressure the diver is in .................................the diver WILL end up IN THE HAT
It is not just 75 psi it is 75 psi times the area of the body having pressure applied, ie. the diver's whole body in Square Inches times the pressure of the water at depth.
See you topside! John
The non return valve is checked before attaching a hat to a life line. (umbilical)
If there is not a non return valve on the hat, and the pressure in the hose is not equal to or greater than abient pressure the diver is in .................................the diver WILL end up IN THE HAT
It is not just 75 psi it is 75 psi times the area of the body having pressure applied, ie. the diver's whole body in Square Inches times the pressure of the water at depth.
See you topside! John
Actually it's more along the lines of having a 300' snorkel. If you've ever tried breathing underwater through a non-pressurized hose, it quickly becomes evident that the deeper you go the more the hose actually does try to suck the air out of your lungs. If you get down just a few feet deep you can no longer breathe.
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You've got to have a difference in pressure for this to happen. The pressure inside your drysuit is the same as the outside pressure. Same thing with the pressure inside your lungs and that's why our tissues load up with nitrogen at depth.
I've never dove with a hat so it's a little out of my realm, but if you have to equalize your ears, then it is pressurized.