All ‘normal’ acetylene torch backfire arresters that I know of will not even slow down a BG backfire; that’s not what they are designed for.
They are designed to prevent oxygen and acetylene from mixing together in the fuel lines; which would happen if one or the other bottle has too low of pressure and the wrong gas would try to back-flow into it, thereby creating a combustable mixture in the oxygen or acetylene bottle.
That type of ‘backfire’ arrester does nothing for fuel that is already mixed with oxygen.1. Most of them are just a check valve. The BG backfire is traveling at speeds up to 6000 feet per second. The backfire zips past the check valve before it can even move.
2. Further, the BG backfire creates a vacuum behind it, which would further tend to hold the valve open; and finally;
3. Even if the valve was shut, the shock wave from the BG explosion can travel through the valve parts and ignite the BG on the other side of the valve.4. A few of them have a ‘screen’ (wire mesh) to quench a backfire. The BG flame is so hot that it vaporizes the screen.There are inline backfire arresters that are reasonably reliable for BG (though they too will eventually fail and/or need maintenance). I recommend having two inline, so when the first one fails, the second will catch the backfire; then move the second to the front and replace the second with a new (or refurbished) one.
The only totally reliable way to stop a BG (HHO) backfire is to use a bubbler, where the BG is separated into tiny bubbles that rise through water of at least 4 inches deep. It the water isn’t deep enough, the backfire can go from bubble to bubble and thus go through the water.
The best bubbler design is a tube in tube bubbler because it doesn’t rely on a check valve to prevent bubbler water from being sucked back into the electrolyzer when the electrolyzer has a lower pressure (from internal implosion or just cooling of hot gasses).