Английский для сварщиков. Гричин С.В. - 84 стр.

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84
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
tanks. Open the oxygen valve slightly and then wait while the high pressure
gauge on the regulator stops rising. Then open the valve fully, until it stops
turning. This is a back stop valve. Turning the valve all of the way out
prevents leakage through the packing of the valve.
Open the fuel valve also. Only open an acetylene valve one quarter
turn. This helps prevent the acetylene from being drawn off too quickly. If
acetylene 'bubbles' too rapidly from the acetone, it might become unstable.
Open the valve on a LPG tank out completely as on an oxygen tank and for
the same reasons.
If there are any leaks in the connections, regulators or torch, or any
other faults with the equipment, a safety hazard exists. The equipment should
not be used.
Never oil an oxygen regulator. It will cause a fire or explosion — solid
brass regulators can be blown apart from the force. Keep oxygen away from
all combustibles.
The flame
After this preparation, set the regulators at the desired pressure. For
acetylene, this should never be more than 103 kPa (15 lbf/in²). To prevent a
large yellow, sooty flame when first lighting the torch, open both the fuel and
the oxygen valves (more fuel than oxygen), and light a flame with a 'striker'

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