Ok, I reread the posts, and there are two reasons why the ruptured hose is not going to be a problem other than the fact that you now have to do a controlled emergency
swimming ascent which you practiced in your scuba
One, the pressure difference you described,
"In the case of inhaling air while at a depth
of 6 feet the lungs hold a positive pressure compared to the ruptured hose at a surface pressure of 1 atmosphere and that pressure is against where the airway closes when holding one's breath. If the differential is great enough you damage yourself, maybe causing death..it has happened."
A hose that is open at the surface, led down to 33 feet, will have 2 atmospheres of pressure at 33 feet. Not just the 1 atmosphere felt at the surface but also the weight of the air in the column leading down to the diver at 33 feet, being the same pressure as in the divers lungs. I think that you're forgetting that the air and seawater still exert their pressure on that hose no matter how deep you are.
Secondly, on the second stage regulator
the intermediate pressure (from compressor
or 1st stage reg) flows through an orifice and pushes against the seat, which is held shut by the spring. It uses that air pressure to help open the valve. This is why second stage regs must always be adjusted to the intermediate pressure, and you cant just take any reg, throw it on a hose at the end of a compressor
and go diving
. If the 2nd stage is adjusted for a 120# I.P. and you give it a #135 pound source it will freeflow the 2nd stage. If it's set for #145 and your compressor is putting out #120 you're going to be pulling like hill to get air through it. That is what limits the depth
of hookahs, after the #30 pressure difference of diving
60' you work too hard to open the reg valve.
The second stage really needs to be properly adjusted on a hookah for use at the surface with a magnahelix gauge at 1.0 -1.2" of mercury
. Which is one more reason why people reading this thread shouldn't just go to home depot buy a compressor and start diving. There are lots to go wrong, a lot of physics involved, and a lot of equipment
. Take a dive class to learn the basics first. Diving is an unregulated sport, Darwinism still rules the day, that's why the industry regulates itself and requires certification
before air fills.