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The superior quality of our flashback arrestors makes them one of our most widely used products. A flashback is a flame travelling at supersonic speed in the opposite direction to normal gas flow in oxy-fuel gas equipment.
The Cause of Flashbacks
The backfeeding of gases that promotes flashbacks is generally caused by one of the following:
- Excessive pressure – If the flow rate exceeds the nozzle capacity, the gas at the higher pressure then flows into the lower-pressure gas line. This will occur if incorrect pressures are used or if nozzles, cutting attachments, and welding torches are incompatible.
- Lighting up incorrectly with both torch control valves open but one cylinder closed – In spite of better equipment, flashbacks remain a problem in oxy-fuel gas systems. There are many reasons for this, including the growing use of welding and cutting equipment by unskilled or semi-skilled persons who sometimes short-cut safety procedures in order to save time.
- A drop in pressure of either gas due to leaks in the regulator, hose or connections – This results in backfeeding into the low-pressure line.
- The reverse flow of gases during temporary storage or shutdown, incorrect closedown procedures or malfunctioning valves or regulators.
Flashback Arrestor SABS Certificate (488mb) 17 September 2104 – 30 September 2017.
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