What is the maximum safe working pressure of acetylene at 21 degrees C?

What is the maximum safe working pressure of acetylene at 21 degrees C?

• A. 15 psi @ 21 degrees C
• B. 20 psi @ 21 degrees C
• C. 25 psi @ 21 degrees C
• D. 30 psi @ 21 degrees C

Answer: (A)

Acetylene is highly unstable when compressed, so its safe operating pressure is kept very low, especially at room temperature. At about 21°C, the maximum safe working pressure is 15 psi. Keeping the pressure at or below this level helps prevent the acetylene from decomposing or reacting violently, which could lead to an explosion, particularly if the gas is warmed or shocked. That’s why 15 psi at 21°C is used as the safe limit in typical welding practice. Pressures like 20, 25, or 30 psi exceed this safe limit and increase the risk of dangerous decomposition.

Acetylene is highly unstable when compressed, so its safe operating pressure is kept very low, especially at room temperature. At about 21°C, the maximum safe working pressure is 15 psi. Keeping the pressure at or below this level helps prevent the acetylene from decomposing or reacting violently, which could lead to an explosion, particularly if the gas is warmed or shocked. That’s why 15 psi at 21°C is used as the safe limit in typical welding practice. Pressures like 20, 25, or 30 psi exceed this safe limit and increase the risk of dangerous decomposition.