At what psi are acetylene gauges always red-lined?

The correct answer is based on safety standards associated with acetylene usage in oxyfuel cutting. Acetylene is a highly flammable gas, and its pressure must be monitored to prevent any potential hazards. Gauges typically indicate a red line to signify the maximum safe operating pressure for acetylene, which is standardized at 15 psi.

This pressure limit is critical because exceeding it can lead to dangerous situations such as instability in the gas itself and an increased risk of flashbacks or explosions. The gauge serves as a visual reminder for operators to ensure that the pressure remains within safe limits while cutting or welding.

Understanding this concept is essential for maintaining safety protocols in welding and cutting operations, as adhering to the proper psi ensures that the equipment functions effectively without compromising safety.