Английский язык для инженеров сварочного производства. Гричин С.В - 70 стр.

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70
Setting up the equipment
When using fuel and oxygen
tanks they should be fastened
securely to a wall, a post or a
portable cart in an upright position.
An oxygen tank is especially
dangerous for the reason that the
oxygen is at a pressure of 21 MPa (3000 lbf/in² = 200 atmospheres) when full
and if the tank falls over and the valve strikes something and is knocked off,
the tank will become an unguided and unpredictable missile powered by the
compressed oxygen. It is for this
reason that an oxygen tank should
never be moved around without the
valve cap screwed in place.
Never lay the acetylene tank
down while being used, as the acetone
would start to come out through the valve. If it was laid down while being
transported, it must be set upright, valve on top.
After the oxygen tank is securely fastened, remove the valve cap. With
the valve opening pointed away from the welder, open the valve slightly for
just a moment and then close it. This serves two purposes. For one, it blows
out any dirt or dust that may have settled in the valve. This dirt would
otherwise end up in the regulator and shorten its life and accuracy. For
another, when a tank is filled, the worker has a tendency to tighten the valve
securely to make certain it is closed completely. It is better to break it loose
now than when the regulator is in place. Attach the oxygen regulator and
tighten the nut. Never use pliers, as the pliers will soon damage the brass nut;
always use a wrench. Also, there is a tendency of welders to over tighten the
nut. If it is not leaking, then it is tight enough. If a great amount of torque is
needed to stop it leaking, or if it will not stop leaking in spite of any amount
of tightening, then there is something wrong with the nut, the gasket or the
valve.
Attach the fuel regulator to the fuel tank in the same manner. The nut
on the fuel regulator usually has left hand threads.
Attach the flexible hoses from the regulators to the torch. The oxygen
hose is usually colored green and the fuel hose red. The fuel hose has left
hand threaded connectors at both ends and the oxygen has right hand
threaded connectors.
With the valves on the torch closed, and the knobs on the regulators
screwed out until loose (0 setting), open the valves on the fuel and oxygen
Fig. 8
Oxygen
Rich Butane Blow Torch Flame
Fig. 9
Fuel Rich Butane Blow Torch Flame

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