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Re: [PSUBS-MAILIST] Question about pressure compensation



In a message dated 1/18/2005 4:09:22 P.M. Eastern Standard Time, thijs-struijs@planet.nl writes:
Bill and the rest,
 
Pressure compensation of battery pods and trusters with air seems the most simple and clean way to do it i think. It also has the advantage that you don't have to put a square battery in a bulky round box. But in a discussion on this subject a view years ago Michael Wludarczyk wrote that at higher pressure (300 psi / 200 mtr.)  the partial pressure of the oxygen (PPO2) becomes so high that there is a substantial fire risk. This is of course a lethal depth for an ambient sub but i want to go to 100 mtr. in an 1 atm. sub. Eigther i missed something during my schooldays or i simply forgot but PPO2 doesn't mean anything to me.  Is there someone on the list who can say something sensible about this?
 
Thanks,
 
Thijs Struijs
The Netherlands   
Just pressurize it with CO2 or a noble (inert) gas. I finished two semesters of Chemistry only a year ago and I don't remember anything about partial pressures. I don't think I passed that part of the class.....