Thanks guys,
It's just a generalisation I'm looking for, I know there's a huge variation type to type but it seems generally nothing much below around 900psi...
I'm just trying to write a business case for a couple of airlines to install gas intensifiers to their oxygen carts - for example the outfit I am working for right now (B1 eng) has a minimum nightstop level of 1600psi, so we are sending our oxy bottles back for recharge when they are still more than half full, doesn't make sense. Just wondering how many other airlines do the same..........