Dry Type
Dry flashback arrestors typically use a combination of methods to stop flashback. This is the type that is typically found in most workshops, homes and portable oxy-fuel kits as they work just as effectively with any orientation, need very little maintenance, and are often small and light enough to be installed between the torch and hoses. They include:
- Flame trap to cool the flame front. They are designed to allow free flow of gas through them but to take the heat out of the flame front to get it below the ignition temperature of the burning gas mixture. The most common types are:
- Sintered metal or ceramic.
- Layers of mesh.
- Ceramic beads.
- Temperature-triggered valves to stop the gas flow completely. Because it relies on extracting heat from the flashback to stop it continuing, most arrestors have a temperature-controlled valve that will cut off the gas flow when the unit reaches around 90°C, until either the unit cools (if the unit is automatic) or the reset button is pressed (if the unit is manual).
- A check valve that closes due to the back pressure.
Read more about this topic: Flashback Arrestor
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