This is my plan for a high volume, low pressure oxygen system for operating propane glassworking torches.
[Disclaimer: I know next to nothing about glassworking, and I am not an engineer.]
My only original bit on this system is a combo vacuum/pressure gage at the outputs of the oxygen generators. The generators (concentrators) contain sieve beds (for nitrogen removal) that can be damaged by a vacuum condition.
The concentrators are rebuilt home medical units.
I haven't built it yet but this system will run a GTT brand Phantom torch at full blast.
The compressor is an oil-free design. Gast 86R123 Flow vs Pressure graph:
The system will be assembled in a rack of 2x4 foot wire shelves.
Detail of the Condor brand four-port pressure switch.
Right now, I'm waiting for some parts and I need to clear my install space.