I'm an ocassional welder, done some stick and some wire feed. Just picked up a victor oxy acetylene welding/cutting setup ( i think it's the journeyman) and bottles. I really want to cut some 2 7/8" OD 1/8" pipe. I turn on the acetylene 3/4 turn and oxygen all the way and one turn back, then on the cutting attachment, I turn on just the acetylene and light it up. It lights up, but when I let in some oxygen the flame dies out. Any suggestions on using this setup will be appreciated, i.e. the regulator pressures I should be cutting the pipe at.