Rob - For at least 10 years, I used residential pressure natural gas
and compressed oxygen. It was possible because I used a Meco Midget
torch with ventilated tips. Those tips are now available from Paige
Tools and make a huge difference for heat.
When the old ventilated tips I had were used up, and Paige hadn’t
started to make the new ones (which are much better) I bought a
natural gas concentrator - G-Tec to boost the pressure. It is
actually a better answer and the only legal fuel source approved by
the NY Fire Department for use in town. It just makes it all faster.
NYC approves it because that is the only way that you can control
flash-back - the street pressure, unaided won’t engage a flash back
At school, we used residential pressure natural gas and compressed
air with a BIG torch. It worked well for big stuff - but really
taught you torch control for little things.
Judy Hoch, G.G.