Since it turned out to be an (expensive) major pain to get our oxygen tank refilled, here in our area, I thought about building a cascade system for our hangar.
I understand the idea behind it, I understand how the tanks are connected and how they are used. What I however don’t understand is if a special type of tank is used, which can be filled to a higher pressure than the tank which goes into the plane?
The regular industrial oxygen tanks are filled up to about the same pressure as the tank for our plane. While a cascade system would allow me to fill the plane tank pretty close to its ‘full’ pressure, I would never quite make it there. With every subsequent filling, the gap between the actually achievable max. pressure and the desired pressure would become bigger and bigger.
I this correct or are you using tanks which can be filled to a higher pressure, than the plane tank, for your cascade system? I found ‘high capacity tanks’ which can be filled up to 4,500 psi, they however don’t seem to be too common. I am also not sure if they can be filled at all welding supply stores.