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This page contains the sandbox edit history before a page move accident. For earlier history, see [[Wikipedia:Historical archive/Earliest sandbox history]], [[Wikipedia:Historical archive/Sandbox]] and [[Wikipedia:Historical archive/Sandpit]] (it was then at the title ''Sandbox''). For more recent history, see [[Wikipedia:Sandbox/Archive]] and [[Wikipedia:Sandbox/Archive2]].
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== chode lickin ==
The regulators are attached to the fuel and to the oxygen sources. The oxygen regulator is attached to the oxygen tank and drops the pressure from about 21000 kPa (3000 lb/in² = 200 amospheres) to a lower pressure for the torch. This pressure can be adjusted to suit the job at hand by turning a knob on the regulator, and can be set from 0 to about 700 - 1400 kPa (100 - 200 lb/in²). Likewise the fuel regulator is attached to the fuel source and drops the pressure to a level for the torch to use. For acetylene this is 0 to 100 kPa (15 lb/in²).
The flexible hoses connect from the regulators to the torch and carry the fuel gas and the oxygen. The fuel gas connections have left hand threads and the oxygen connectors have right hand threads so that the two cannot be interchanged, so as to help prevent accidents.
The welder wears goggles or a shield with a shaded lens to protect his eyes from glare and flying sparks and splatter, and wears leather gloves to help protect his hands from burns. He should also wear clothes and shoes appropriate for welding. [[Sunglasses]] are <b><u><i>not</i></u></b> adequate.
Note that the proceedures and equipment used for gas welding are essentially the same as for gas [[brazing]].
==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 21000 kPa (3000 lb/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 overtighten 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.
Oxygen should not be withdrawn from a high pressure cylinder more rapidly than one tenth of the capacity of the cylinder. The diatomic oxygen molecules may split and form monoatomic molecules. This might cause an explosion. This is seldom a concern when only one torch is connected to the tank. For high volume needs, several cylinders are connected together by means of a manifold.
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 [[liquified petroleum gas|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 as they do not play well together and are known to pull hair and kick in the shins.
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