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Reading 3
17 Read about welding gases and fill in the table.
Acetylene Mapp Gas
Chemical composition
Flame temperature
Colour and odor
Stability (temperature)
Cylinder packing
Dangerous effects on
health
Acetylene
Acetylene is a flammable fuel gas
composed of carbon and hydrogen having the
chemical formula C2H2.When burned with
oxygen, acetylene produces a hot flame,
having a temperature between 5700°F and
6300°F. Acetylene is a colorless gas, having a
disagreeable odor that is readily detected even
when the gas is highly diluted with air. When
a portable welding outfit, similar to the one
shown in figure 4 is used, acetylene is
obtained directly from the cylinder. In the case
of stationary equipment, similar to the
acetylene cylinder bank shown in figure at
right, the acetylene can be piped to a number
of individual cutting stations.
Hazards: Pure acetylene is self-
explosive if stored in the free state under a
pressure of 29.4 pounds per square inch (psi).
A slight shock is likely to cause it to explode.
WARNING: Acetylene becomes extremely
dangerous if used above 15 pounds pressure.
Fig. 3
Portable welding outfit
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