Английский для сварщиков. Гричин С.В. - 75 стр.

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75
pressure to the working pressure you have chosen. A typical double-stage
regulator is shown in figure above.
Problems And Safety
Regulators are precise and complicated pieces of equipment.
Carelessness can do more to ruin a regulator than any other gas-using
equipment. One can easily damage a regulator by simply forgetting to wipe
clean the cylinder, regulator, or hose connections. When you open a high-
pressure cylinder, the gas can rush into the regulator at the speed of sound. If
there is any dirt present in the connections, it will be blasted into the
precision-fitted valve seats, causing them to leak. This results in a condition
that is known as creep. Creep occurs when you shut of the regulator but not
the cylinder and gas pressure is still being delivered to the low-pressure side.
Regulators are built with a minimum of two relief devices that protect
you and the equipment in the case of regulator creep or high-pressure gas
being released into the regulator all at once. All regulator gauges have
blowout backs that release the pressure from the back of the gauge before the
gauge glass explodes. Nowadays, most manufacturers use shatterproof plastic
instead of glass. The regulator body is also protected by safety devices.
Blowout disks or spring-loaded relief valves are the two most common types
of devices used. When a blowout disk ruptures, it sounds like a cannon.
Spring-loaded relief valves usually make howling or shrieking like noises. In
either case, your first action, after you recover from your initial fright, should
be to turn off the cylinder valve. Remove the regulator and tag it for repair or
disposal. When opening a gas cylinder, you should just “crack” the valve a
little. This should be done before attaching the regulator and every time
thereafter. By opening the cylinder before connecting the regulator, you blow
out any dirt or other foreign material that might be in the cylinder nozzle.
Also, there is the possibility of a regulator exploding if the cylinder valve is
opened rapidly.
WARNING: Oil or other petroleum products must never be used
around oxygen regulators because these products will either cause a regulator
explosion or fire
Hoses
The hoses used to make the connections between the torch and the
regulators must be strong, nonporous, light, and flexible enough to make
torch movements easy. They must be made to withstand internal pressures
that can reach as high as 100 psig. The rubber used in hose manufacture is
specially treated to remove the sulfur that could cause spontaneous
combustion.

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