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  1. 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.
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