Answer :
Final answer:
The maximum safe pressure for acetylene gas when welding is 15 psi, as higher pressures can lead to instability and increase the risk of explosions. Option B.
Explanation:
The maximum safe pressure for acetylene gas when welding is 15 psi. Acetylene is highly combustible, and higher pressures can increase the risk of a dangerous explosion or fire. Using a pressure higher than 15 psi is not recommended because acetylene becomes unstable and can decompose explosively. Safety protocols and welding guides specify that acetylene should be used at low pressures to ensure safe operation during welding activities.
