What happens to acetylene when it exceeds its safe pressure limit?

When acetylene exceeds its safe pressure limit, it becomes unstable and potentially dangerous. Acetylene is a highly flammable gas that, under certain conditions, can decompose explosively. This instability is particularly pronounced at pressures above 15 psi (pounds per square inch). If the pressure rises too high, acetylene can undergo a process called "explosive decomposition," where it breaks down into simpler substances, which can lead to a violent reaction.

Maintaining acetylene within its recommended pressure limits is crucial to ensure safety during its use, especially in welding and cutting applications. The characteristics of this gas require careful handling to prevent hazardous situations. Understanding the nature of acetylene helps in recognizing the importance of pressure limits and safe operational practices in relevant industries.