Which device is designed to eliminate the possibility of an explosion in the regulator or cylinder?

Which device is designed to eliminate the possibility of an explosion in the regulator or cylinder?

• A. flashback arrestor
• B. pressure regulator
• C. safety valve
• D. filter

Answer: (A)

Preventing flame from traveling back into the gas supply is the primary safety goal, especially with flammable gases like acetylene. A flashback arrestor is placed in the line near the torch or regulator and is built to stop a flame that travels back toward the cylinder. It uses a heat-sensitive element that closes to block flow if a flame is present and often includes a cooling path or a check valve to prevent backflow, effectively quenching the flame before it can reach the regulator or cylinder. This directly eliminates the possibility of an explosion in the regulator or cylinder by interrupting the flame’s path. The other devices don’t serve this purpose: a pressure regulator only lowers and stabilizes downstream pressure, not backflow of flame; a safety valve relieves excess pressure but doesn’t block flame traveling back into the system; a filter cleans particulates but does not stop a flame from propagating back toward the cylinder.

Preventing flame from traveling back into the gas supply is the primary safety goal, especially with flammable gases like acetylene. A flashback arrestor is placed in the line near the torch or regulator and is built to stop a flame that travels back toward the cylinder. It uses a heat-sensitive element that closes to block flow if a flame is present and often includes a cooling path or a check valve to prevent backflow, effectively quenching the flame before it can reach the regulator or cylinder. This directly eliminates the possibility of an explosion in the regulator or cylinder by interrupting the flame’s path.

The other devices don’t serve this purpose: a pressure regulator only lowers and stabilizes downstream pressure, not backflow of flame; a safety valve relieves excess pressure but doesn’t block flame traveling back into the system; a filter cleans particulates but does not stop a flame from propagating back toward the cylinder.