Quote:
Originally Posted by Stiebler
"It is correct that on board the submarines, besides the compressed air-bottles, had also bottles with pure oxygen. Both bottle-types had a pressure of 20 atmospheres = Bar. The compressed air-bottles were used for blowing when surfacing. The bottles with pure oxygen were required if the boat was an extended time under water and the oxygen in the boat came to an end.
|
20 atms of pressure air means a submarine can't blow it's ballast tanks in depths over 200m. Doing so results a backflow, as sea water rushes into air tank. One-way valve can prevent it but also air won't be transfered to ballast tank either.
Gas welding kit which uses mixture of acetylene/oxygen has oxygen pressure of 200 atms and it was around during ww2.