How should a torch be properly lit?

How should a torch be properly lit?

• A. Open the oxygen valve first and ignite
• B. Open the acetylene valve slightly, ignite, then open the oxygen valve
• C. Light the torch with no gas flow
• D. Use a match to ignite both gases together

Answer: (B)

The correct procedure for lighting a torch involves opening the acetylene valve slightly, igniting the gas, and then opening the oxygen valve. This method is important because acetylene is a flammable gas that can ignite easily; lighting the torch in this way ensures a controlled ignition that minimizes the risk of backfire. By first allowing a small amount of acetylene to flow, you can create a stable flame, and once it is ignited, adding oxygen allows you to adjust the flame to achieve the desired characteristics, such as the temperature and shape. Using this sequence prevents the risk of a potentially dangerous situation that could arise if oxygen is introduced first without ignition; opening the oxygen valve too early could lead to the accumulation of gas, which could ignite in an uncontrolled manner. Thus, starting with acetylene provides safer control when establishing the flame, making this the recommended practice for torch lighting.

The correct procedure for lighting a torch involves opening the acetylene valve slightly, igniting the gas, and then opening the oxygen valve. This method is important because acetylene is a flammable gas that can ignite easily; lighting the torch in this way ensures a controlled ignition that minimizes the risk of backfire. By first allowing a small amount of acetylene to flow, you can create a stable flame, and once it is ignited, adding oxygen allows you to adjust the flame to achieve the desired characteristics, such as the temperature and shape.

Using this sequence prevents the risk of a potentially dangerous situation that could arise if oxygen is introduced first without ignition; opening the oxygen valve too early could lead to the accumulation of gas, which could ignite in an uncontrolled manner. Thus, starting with acetylene provides safer control when establishing the flame, making this the recommended practice for torch lighting.