A flashback is defined as a flame traveling almost instanta-neously in the opposite direction to the normal gas-flow. A flashback incident can cause irreparable damage to equip-ment and can, in a worst case scenario, be catastrophic if the flash enters the gas cylinder resulting in an explosion. Back-feeding of gas flames can be a result of various inci-dents of which incorrect closing-down of equipment, pres-sure drop, incorrect igniting procedure and excessive pres-sure to name but a few. Flashback arrestors are safety-enhancing items which ensure gas-flow in one direction on-ly. Any brazing, heating, gas welding or cutting operation should not be done without flashback arrestors being fitted to both regulators and torch.
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