Hard- Surfacing, Building Fusion Welding Carbon Welding Non-Ferrous Metals Heating & Heat Treating Braze Welding Welding Cast Iron Welding Ferrous Metals Brazing & Soldering Equipment Set-Up Operation Equipment For OXY-Acet Structure of Steel Mechanical Properties of Metals Oxygen & Acetylene OXY-Acet Flame Physical Properties of Metals How Steels Are Classified Expansion & Contraction Prep For Welding OXY-Acet Welding & Cutting Safety Practices Manual Cutting Oxygen Cutting By Machine Appendices Testing & Inspecting
11 Stopping Work To extinguish the flames, first close the torch fuel gas valve, then the oxygen valve. Closing the fuel gas (acetylene) valve first reduces the chance of allowing unburned fuel gas to escape and be ignited accidently. When stopping work for an hour or longer, always release all pressure from the torch, hoses, and regulators. To do this, first close both cylinder valves, then open both torch valves. Finally, release the pressure- adjusting screws of both regulators and close both torch valves. Before disconnecting a regulator from a cylinder, always release all pressure from the regulator. To do this, follow the same procedure set forth immediately above. If the regulator is likely to remain out of service for several weeks or more, it is a good idea to turn in the pressure-adjusting screw until some spring resistance is felt (after removing the regulator from the cylinder). This will remove pressure from the regulator valve seat and thus lengthen the life of the seat. Correction of Equipment Deficiencies Which May Show Up During Setup and Testing Never use torches, regulators, or hose in need of repair. It is usually difficult to tell whether equipment needs repair until you have hooked it up and tested it. Some flaws may not show up until you have actually lighted the torch. We have stressed the importance of making sure that all connections are leak-tight, and outlined the procedure which should be followed in making, breaking, and remaking connections. Now we wish to go a bit farther, and provide some general instructions covering what you should do when something is still obviously wrong. Regulators: If the regulator-to-cylinder connection still leaks after you have broken it, cleaned the seating surfaces, re-made and re-tested it, the odds are that the regulator inlet nipple is marred or deformed so that it will not make up leaktight to any cylinder. In that case, the nipple must be replaced. You can’t do that on the spot. The regulator must be turned over to a qualified repairman or repair station. Continued on next page...