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The hoses from your torch should attach to the nozzles on the oxygen and acetylene tanks. Typically, oxygen tanks and hoses are green, and acetylene hoses are red. The hoses are usually paired together, and the ends are separated so they can attach to their respective tanks. The acetylene hose will have reversed threads and a male fitting to make it easier to tell them apart. Since the fittings are made of brass and can easily be damaged, tighten them with an appropriately-sized wrench. To check that the regulator is completely off, back the tee handle out a few turns. This handle will be on top of the tank right next to the regulator valve. This will help ensure that you have complete control over the acetylene gas pressure. At higher than 15 psi (100 kPa), acetylene becomes unstable and may spontaneously ignite or explode. Again, it’s extremely important to maintain control over the flow of the acetylene, so you want to open the gas valve just enough to allow a constant, steady flow of the gas. Opening the tank more than a single turn could lead the gas to become unstable, and it will be harder to turn off in the case of an emergency. This is the same handle that you closed before opening the gas valve. You should open this very slowly, and you should constantly monitor the low-pressure gauge while you’re opening the valve. Open it only until the pressure indicated is between 5–8 psi (34–55 kPa). To vent the atmosphere from the acetylene hose, open the gas valve on the cutting torch handle until you hear gas escaping, then observe the low-pressure gauge to see if the pressure remains steady during flow and ensure that you have this regulator set correctly. Close the acetylene valve on the torch once you are sure the pressure is regulated.. In the same way that you closed the acetylene regulator, back the oxygen regulator gauge out a few turns. Once you’ve done that, turn the handle on the main oxygen tank so it’s all the way open.  The setup on top of the oxygen tank will be similar to that on the acetylene tank. The oxygen valve is a double-seated valve. When you open it, be sure to turn the handle so the valve is all the way open. Otherwise, the oxygen will leak out around the valve-stem O-ring. Just like with the acetylene regulator, you’ll turn the tee handle very slowly, watching the low-pressure gauge as you do so until the pressure reads between 25–40 psi (170–280 kPa). There are 2 valves on the oxygen side of the cutting torch assembly. To begin with, open the valve closest to the hose several turns to ensure sufficient oxygen is available for both functions. Next, open the forward valve slightly until the hose is purged (about 3-5 seconds for a 25 feet (7.6 m) hose), then close the forward valve. The valve near the hose connections will control the flow of oxygen to the mixing chamber for the combustion, so no oxygen should vent from the torch tip until either the cutting lever is depressed or the valve further up the torch is opened.

Summary:
Hook up the gauges to the appropriate tanks. Make sure the acetylene regulator is turned off. Open the gas valve on top of the acetylene tank with one turn of the wrist. Open the regulator valve by turning the tee handle clockwise. Open the gas valve on the torch handle to vent it. Turn the oxygen regulator off, then open the main oxygen tank all the way. Open the oxygen regulator valve slowly. Open and close the oxygen valve on the torch to vent the atmosphere.