Acetylene Cutting Torch
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gas welding cutting torch?
from start to finish what is the correct way to set up and use a oxy, acetylene cutting torch?
DON'T DO THIS IN YOUR BASEMENT!
Be in a well ventilated area!
The tanks should be secure to a wall or a tank cart.
Remove the tank caps. Slightly open then close valves quickly to blow out debris so it doesn't contaminate your gauges . The acetylene can blow out acetone if you open it too much or too long.
Connect the regulators to the tanks, connect a flashback arrestor to the regulators then connect the hose to the flashback arrestors. Then connect the hose to the torch.
You need to loosen the regulator adjusters ( the "T" handle on the regulator) until you feel them turn freely.
Check that your torch valves are closed. Open your tank valve on the oxygen slowly and close. Check that the high pressure gauge comes up to pressure around 2500psi and does not leak down.
Check all the connection with soapy water. If its bubbling you may need to tighten them. Do the same test for the acetylene ~200 - 250psi for high pressure.
Turn the regulator adjustment on the oxygen to about 25psi slowly. Listen and watch. Hear a hiss close the torch valve. you should see the low pressure oxygen gauge rise and this will lower the high pressure side some. Remember your tanks are off. Bubble test all connections up to the torch.
Do the same procedure with the acetylene but adjust up to about 5- 10psi max. Anything over over 15psi on acetylene has dangers. Acetylene is unstable above 15psi and can explode. Plus running high pressure will cause the acetone to come out with the acetylene causing bigger problems.
After you have bubble tested all connections up to the torch check that the low pressure side of each regulator has maintained is value, if it has not you may not have had any pressure to bubble test. You will then need to crack the valve open to determine which one is leaking.
If you have no bubbles on either side then....
Open the oxygen tank valve all the way and the acetylene 1/4 to 1/2 turn. Put a helmet or goggles with a #4 shade on so you can look at the flame without eye damage. Yes prolonged looking at the bright flame will hurt your eyes.
Purge the acetylene line by opening the torch valve for a few seconds. Close if/when you smell acetylene. Check low pressure side that it is still at your first setting and readjust.
Attention!
Yes you have installed flashback arrestors but if your flame goes out and you hear a loud whistle, turn off your acetylene at the torch and you should immediately close the valve on acetylene tank. In some cases it might indicate a torch problem that is forcing oxygen up the fuel hose. Locate the problem and repair.
Open the acetylene at the torch this time use the spark lighter at the torch tip. You will want a big yellowish-orange flame that is still in contact with the torch tip. If its not touching the tip it will go out when the oxygen is turned on. Open the oxygen valve on the torch. You will now adjust the flame to a crisp blue not fuzzy. You want to adjust till the fuzziness just disappears. This will be a neutral flame. If you go too far you will get an oxidizing flame noted by its hiss. And the flame will be shortened quite a bit. Hit the oxygen jet and you should see a opening in the middle of the flames and hear a louder hiss. Place the tip close to your metal to heat it up to a slight red hit the cutting jet and you should be cutting.
Close your tank valves open the torch and light the acetylene line to burn off the gas then close the valve. Then open the oxygen at the torch and drain the oxygen line, close when drained. Remove torch, hoses, regulators, and replace tank caps.
Hope I didn't forget anything. Good luck.
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December 5th, 2009 in
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