What device prevents flashback in a pipe?

What device prevents flashback in a pipe?

• A. Flame arrestor
• B. Safety valve
• C. Check valve
• D. Regulator

Answer: (A)

Preventing flashback in a pipe is accomplished by a flame arrestor. This device has many narrow passages or a metal mesh that cools and disrupts a flame front as it tries to travel back toward the ignition source. The cooling and intimate contact with the passage walls quench the flame and block its propagation, keeping the upstream equipment safe from ignition. A safety valve relieves pressure and a regulator lowers pressure, but neither is designed to stop a flame from moving upstream. A check valve prevents reverse flow of gas or liquid, but it does not reliably quench a flame and may not stop ignition traveling back through the line. That's why the flame arrestor is the appropriate choice to prevent flashback.

Preventing flashback in a pipe is accomplished by a flame arrestor. This device has many narrow passages or a metal mesh that cools and disrupts a flame front as it tries to travel back toward the ignition source. The cooling and intimate contact with the passage walls quench the flame and block its propagation, keeping the upstream equipment safe from ignition.

A safety valve relieves pressure and a regulator lowers pressure, but neither is designed to stop a flame from moving upstream. A check valve prevents reverse flow of gas or liquid, but it does not reliably quench a flame and may not stop ignition traveling back through the line. That's why the flame arrestor is the appropriate choice to prevent flashback.