Torch-Cutting Operations

Using a cutting torch in a warehouse can also generate sparks, heat, fire, fumes, gases, and exposures harmful to the lungs, eyes, skin, and body. There are specific guidelines for the use of cutting torches that could be applied directly to warehouse operations. 

---

A fire extinguisher must be kept in reach any time torch-cutting operations are conducted. 

Plasma arc cutting operates on the principle of passing an electric arc through a quantity of gas through a restricted outlet. The electric arc heats the gas as it travels through the arc. This turns the gas into a plasma that is extremely hot. It is the heat in the plasma that heats the metal. A typical power source for plasma arc cutting is about the size of a small transformer welder and comes equipped with a special torch, as shown in Figure 24.29. 

It should be noted that the use of open-flame torches and welding machines is not a part of normal warehouse operations. This type of work must be left to those that have the skills and training. The use of torches and welding can easily start a fire. Every precaution must be taken to ensure that the work area is free of combustibles, flammables, and any other ignition source. Even when the job has been completed, a fire watch should be in place to ensure the safety of the building and employees. More information on the use of welding and cutting operations can be found in Chapter 20. 

Operations such as gas or electric welding and cutting with cutting torches cannot be safely performed on hydrogen gas pipelines, mains, or auxiliary equipment, unless all possibility of leakage of hydrogen into the work area is eliminated. The following procedures are recommended ... 

Only authorized and trained personnel are permitted to use welding, cutting, or brazing equipment Operators must have a copy of the appropriate operating instrac-tions, which they are directed to follow. Only approved apparati (e.g., torches, regulators, pressure reducing valves, acetylene generators, and manifolds) can be used. 

Note In gas welding or oxygen cutting where the torch produces a high yellow light, use a filter or lens that absorbs the yellow or sodium line in the visible light of the operation. 

If hot work inside the space is interrupted, special precautions should be implemented. Disconnect power to arc welding or cutting units and remove the electrode from the holder. Turn off torch valves and shut off the gas supply to gas welding or cutting units at a point outside. Remove the torch and hose from the space, if possible. Cylinders for welding operations should never be placed in confined spaces. 

In industrial applications, oxy-fuel cutting is the predominant flame process for cutting mild- and low-alloy steels (see Fig. 2.33). With the right gases, a good torch and a steady hand, this process enables an experienced operator to cut steel anywhere, as it does not require electricity or complicated equipment. Although developed at the beginning of the last century, the basic processes stiU apply today. 

The ampoule sorption vessel is designed for slow dissolution process and for wetting operation [43, 56]. The sample is introduced inside a special glass ampoule the upper part of which is connected to a vacuum pump and the bottom part of which is very thin. After outgassing during 30 min, the ampoule is sealed with a torch and the upper part of the ampoule is cut and withdrawn. The vacuum operation allows desorbing the surface of the solid sample (especially powder) and makes easier the interaction. The sealed ampoule is introduced in the vessel... 

---