How does flashback arrestor works

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Safeopedia Explains Flashback Arrester Flashback arresters are used in gas welding pipes running from gas cylinders to the nozzles. To operate as designed, the levels of the flashback fluid must be maintained in the device as recommended by the manufacturer. This fluid must be changed annually to prevent contamination.

These liquid flashback arresters have been successfully used across various facilities over the past 60 years. For more information on these flashback arresters, please visit our Liquid Flashback Arrestor Devices page. We are a one stop shop from custom vessel production to full skidding, plumbing and instrumentation. We stand by our processes and communicate with you on your project status as much or as little as you would like.

We continually reinvest in our people, business, and equipment technology to ship quality products on time. The quality and timing were exceptional, I would not hesitate to use them for all future pressure vessel work, - PDI. What are Flashback Arresters?

The gas enters into the device through the inlet pipe fitted with a check valve. The pressure of this gas may vary between 5 and psi. Acetylene gas is usually used at pressures between 10 and 15 psi. Once the gas passes through the check valve, it is made to interact with FBA fluid. This combination creates a double barrier between the down line users and the high-pressure gas in the cylinder. If your oxygen cylinder is low or empty, reverse flow of gas may occur. The fuel gas, being at a higher pressure, can travel up the oxygen line and mix with gas in the hose, regulator and cylinder.

If you light your torch without purging the lines, a burn back may occur with explosions in the hose, regulator, or cylinder. The same thing can happen with high oxygen pressure and low fuel gas pressure if a backfire occurs, which is usually caused by holding the cutting torch too close to your work.

This causes gas starvation of the cutting flame and results in the flame being sucked into the torch head. Usually you will hear a popping sound that turns to a whistle when this happens.