Somewhere on the barrel of that torch handle will be a model #. It looks like an older Journeyman - a 315C handle. If so, it uses series 1 cutting tips.
Assembly: crack the O2 valve then close it. That cleans out any crud from the valve assemble. Mount the regulator, and tighten it well. Spin the adjusting screw all the way out (counterclockwise) until the tension is off the spring. open the cylinder vale slightly, then close it. Note the high pressure gauge reading. Leave it for ten minutes, and recheck it. If it hasn't dropped, then you are leak free! Do the same with the C˛H˛ tank and regulator.
Next, wipe down the hoses with a damp rag and visually inspect them for damage. Hook them up to the regulators and the torch; close the torch handle valves. Open the O˛ tank all the way. Open the acetylene tank valve 1/2 - 3/4 of a turn. Turn in the regulator adjusters (clockwise) until the low pressure gauges read 10 lbs. Noe unscrew the adjusters until there is no spring pressure. Leave it like this for ten minutes and check the readings. If they have dropped, you have a leak on the low pressure side at one of the hose connections. if any reading goes up, the regulater needs repair.
When it all checks out, you're ready to fire it up. Look at this tip chart, and set the pressure according to the tip size on your cutting attachment. This chart shows 5-PSI for acetylene for 000 - 0 size tips; I never go over 3-PSI for those sizes. It's all you need. Open the oxygen torch valve and set the regulator pressure; close the valve. Do the same for the acetylene. Now the hoses are purged and the pressure is set.
Open the acetylene valve on the torch handle 1/8 turn and light the torch with a spark lighter. Increase the acetylene flow until the smoke clears and the flame just "jumps" away from the tip; back off the pressure 'till the flame just returns to the tip. Add oxygen until the flame is "neutral" - a nice, clean, inner-cone that is nearly white in color.
Hit the cutting oxygen lever and make sure the pre-heat flames don't change. Hold the pre-heats 1/8" from the steel you are going to cut. When the steels turns bright red, slowly press the cutting oxygen lever all the way down and move along the cut line. Travel speed is something you'll figure out for yourself pretty quick. If you keep loosing the cut, slow down. If the cut keeps closing behind you, speed up.
Shut donw in the reverse - oxygen off first, then acetylene.
Acetylene (C2H2) as packaged for welding is safe if handled correctly and used as intended. Acetylene becomes very shock-sensitive when compressed to pressures greater than 25 PSIG. To allow storage at higher pressures, welding acetylene tanks are filled with a porous “sponge” which is saturated with liquid acetone. Acetone will absorb acetylene gas at a rate of 1/7 of its volume per hour. The solution of acetylene in acetone is stable at higher pressures. It takes 7 hours to fill an acetylene tank.
By the same token, the gas can only be withdrawn from the tank at the same rate as it was filled. Attempting to withdraw greater than 1/7 of the tank volume for more than a few minutes will result in liquid acetone being withdrawn from the tank. Liquid acetone will quickly eat away the diaphragm of the acetylene regulator, allowing liquid acetone at full tank pressure to enter the hoses and torch.
Acetylene discharged into air (or an oxygen/acetylene torch) at pressures greater than 15 PSIG may cause the gas molecules to disassociate, resulting in free hydrogen gas, which is highly explosive. That’s why the “red line” on acetylene gauges is 15 PSI!
When transporting acetylene tanks, they should remain upright. If they are laid down for any reason, they should be allowed to remain upright for at least 30 minute before use.
When deciding what tips or multi-flame (rosebud) heating nozzles to use, be sure that the hourly consumption rate in cubic feet does not exceed 1/7 of your tank volume. Large (#8 and larger) usually require a manifold array of acetylene tanks to provide the required volume.
Hope all this helps.
Last edited by hankj; 05-22-2006 at 06:00 PM.
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