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

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

• A. 5 psig
• B. 10 psig
• C. 15 psig
• D. 20 psig

Answer: (B)

Acetylene must be used at very low, controlled pressures because it is chemically unstable at higher pressures. The torch’s fuel regulator is designed to deliver a safe, low working pressure, and about 10 psi is the upper limit commonly cited for the acetylene side. Keeping the fuel gas at or below this level helps prevent hazardous conditions such as flashbacks or decomposition of acetylene in the line, while still providing enough heat for typical welding tasks. In practice, many jobs use around 5–7 psi, but safety guidelines set the maximum at 10 psi; pressures above that are not considered safe for standard acetylene torch operation.

Acetylene must be used at very low, controlled pressures because it is chemically unstable at higher pressures. The torch’s fuel regulator is designed to deliver a safe, low working pressure, and about 10 psi is the upper limit commonly cited for the acetylene side. Keeping the fuel gas at or below this level helps prevent hazardous conditions such as flashbacks or decomposition of acetylene in the line, while still providing enough heat for typical welding tasks. In practice, many jobs use around 5–7 psi, but safety guidelines set the maximum at 10 psi; pressures above that are not considered safe for standard acetylene torch operation.