Some questions on HBO chambers

Dear Friends,

I'm working on a monoplace hyperbaric oxygen chamber. The problem I have is that I do not know some details and protocols about this and in the codes, standards, and other references I have not found them. Now would you please help me with these items:

1- The range of humidity ratio allowable
2- The maximum and minimum flow rate of oxygen in the chamber
3- The necessity of a fire-extinguishing system for inside the chamber
4- The maximum oxygen pressure required (3 ATA or 6 ATA?)
5- The maximum air pressure required (3 ATA or 6 ATA?)
6- I have studied the ASME codes and my impression was that if you move a bit the oxygen will ignite! It seems to be a very dangerous thing. What is your experience? How much is the risk?

Thank you very much,
Feras Hakkak