Rail cutting with a Harris torch

How to properly light, adjust and shut down an oxy–acetylene torch

Harris Products Group

Lighting, adjusting and shutting down an oxygen-acetylene torch is easy – especially when following the proper procedures. In addition to these easy to follow instructions, you must always be sure to follow the torch manufacturer's operating procedures.

First - before you attempt to light the torch follow these checks:

  • Make sure regulator pressure adjustment screws are backed out!
  • Make sure torch valves are closed!
  • Stand away from front of regulator
  • Separately and slowly open the oxygen and acetylene cylinder valves
  • Adjust regulator p/a screws to tip pressure settings
  • Open/close torch valves separately and fine tune pressure settings on regulators
  • Depress cutting lever and adjust pressure if necessary

Lighting and adjusting the torch (with a positive/equal pressure mixer):

  • Separately purge both oxygen and fuel gas lines
  • Open fuel gas valve 1/2 turn
  • Ignite flame with striker
  • Increase fuel gas flow until flame leaves end of tip and no smoke is present
  • Decrease until flame goes back to tip
  • Open oxygen valve and adjust to neutral flame
  • Depress oxygen lever and make necessary adjustments

Shutting down the torch (with a positive/equal pressure mixer):

  • Close oxygen torch valve
  • Close fuel gas torch valve

If the torch/regulators and gases are done being used for a while, follow these procedures:

  • Close oxygen and fuel gas cylinder valves
  • Separately purge oxygen and fuel gas lines
  • Make sure all regulator gauges read 0
  • Back out regulator pressure adjustment screws!
  • If you are using in a commercial environment, report any damage, etc. to your supervisor

Remember to always follow basic safety rules when working with oxy-fuel equipment.


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