A flame arrester is a safety device installed on a nozzle on top of a tank when the flash point of the stored product is lower than the possible tank temperature.
A majority of the time, a “vent to atmosphere” pressure / vacuum valve is installed on top of the flame arrester. A flame arrester is also used as in-line safety device where combustible gases are transported through low pressure pipe lines to actual combustion, as in an incinerator or flare or where combustion fumes are vented through piping to atmosphere where lightning can cause a flame. Flame arresters should be designed to stop tank farm fires caused by lightning, sparking, a flame arrester must act as a barrier (stop a flame), a flame holder (contain the flame at the barrier), and dissipate heat in order to prevent auto ignition on the down side of the flame arrester.
Flame Arresters are designed to inhibit flame propagation in gas piping systems and to protect low pressure tanks containing flammable liquids. They protect low flash point liquids from externally caused sources of heat and ignition, providing increased fire protection and safety. The flame arrester consists of two main components, the arrester bases and the flame element housing. The bases serve as the connecting interface to the piping system. The housing accommodates the flame element and is instrumental in stopping the flame passage. The flame element is comprised of small parallel triangular passageways aligned so that an approaching flame front is slowed down and then quenched before it can propagate to the protected side of the device. All NEOTECHKOREA flame elements utilize spiral wound, crimped ribbon constructed of corrosion resistant materials, to insure the best flame quenching performance with minimum pressure drop. A flame arrester should be treated as a safety device and maintained by a knowledgeable repair technician.
STD. CRIMPED BANK ELEMENT STRUCTURE
In order to be an effective flame prevention device, a flame arrester must have a quenching or hydraulic diameter small enough to stop the flame created by the combustible gas. Each combustible gas has a different required hydraulic diameter to be able to stop the flame. In addition to stopping the flame, an arrester must be able to dissipate heat. Flame element mass ensures that hot gases above the auto ignition temperature never reach the downstream side of the flame arrester. With an in-line installation, structural integrity is important to insure safety if a detonation should occur. Proper gasket to insure an oxygen free environment in the event of a detonation is also important. Unless a flame arrester meets or exceeds the above mentioned design criteria, it is not a true flame arrester.