What is the maximum operating pressure setting for an acetylene torch?

The maximum operating pressure setting for an acetylene torch is typically limited to 15 psig. This is because acetylene becomes unstable at higher pressures, which can lead to dangerous situations, such as detonation.

Maintaining the pressure at or below this level ensures safety during operations, as acetylene is a highly flammable gas and requires careful handling. The concern is particularly significant when considering the conditions under which gas is being used, such as the risk of flashback, where the flame can travel back into the torch, causing potential explosions.

In the context of the options provided, the choice of 10 psig reflects a conservative approach, which is generally safe, but it is crucial to understand that during regular operations, acetylene should not exceed 15 psig to maintain both efficiency and safety in welding and cutting processes.