Английский для сварщиков. Гричин С.В. - 69 стр.

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69
The apparatus wrench is sometimes called
a gang wrench because it fits all the connections
on the cutting rig. Note that the wrench shown has
a raised opening in the handle that serves as an
acetylene tank key.
Other common accessories include tip
cleaners, cylinder trucks, clamps, and holding jigs. Personal safety apparel,
such as goggles, hand shields, gloves, leather aprons, sleeves, and leggings,
are essential and should be worn as required for the job at hand.
Oxygas cutting equipment can be stationary or portable. A portable
oxygas outfit, such as the one shown in figure above, is an advantage when it
is necessary to move the equipment from one job to another.
To conduct your cutting requirements, you must be able to set up the
cutting equipment and make the required adjustments needed to perform the
cutting operation. For this reason it is important you understand the purpose
and function of the basic pieces of equipment that make up the cutting outfit.
But, before discussing the equipment, let’s look at the gases most often used
in cutting: acetylene, MAPP gas, and oxygen.
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 above 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.
A portable oxygas cutting and
welding outfit

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