Which device protects against backflow of flame into the regulator or cylinder?

Which device protects against backflow of flame into the regulator or cylinder?

• A. Flashback arrestor
• B. Pressure regulator
• C. Relief valve
• D. Gasket

Answer: (A)

Preventing a flame from traveling back toward the gas cylinder or regulator is about stopping a flame front from moving upstream. The device that does this is a flashback arrestor. It combines a flame-arresting element with a one-way valve so it cools and quenches any flame that tries to move back up the line and prevents reverse flow toward the regulator or cylinder. Placed on the gas line close to the regulator or torch, it protects both the regulator and the cylinder from damage or explosion if a flashback occurs. A pressure regulator changes the pressure of the gas but isn’t designed to stop flame backflow. A relief valve protects against overpressure, not backflow of flame. A gasket seals joints but doesn’t stop flame propagation. So the flashback arrestor is the device that prevents backflow of flame.

Preventing a flame from traveling back toward the gas cylinder or regulator is about stopping a flame front from moving upstream. The device that does this is a flashback arrestor. It combines a flame-arresting element with a one-way valve so it cools and quenches any flame that tries to move back up the line and prevents reverse flow toward the regulator or cylinder. Placed on the gas line close to the regulator or torch, it protects both the regulator and the cylinder from damage or explosion if a flashback occurs. A pressure regulator changes the pressure of the gas but isn’t designed to stop flame backflow. A relief valve protects against overpressure, not backflow of flame. A gasket seals joints but doesn’t stop flame propagation. So the flashback arrestor is the device that prevents backflow of flame.