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. Flashback: It is a progression of flame upstream in fuel pipelines or torches.
A flashback mainly occurs due to the reverse flow of gases upstream into the equipment or hoses. There are several causes of reverse flow such as ambient cylinder pressures, improper start up or shut down procedures, or using a check valve that is not working properly.
It attains a dangerous dimension when the flame progresses to the hose, where it may rupture the hose or separate it from the pipeline. In extreme cases, this flashback may also lead to explosions. Backflows: At times, the gases operated at high pressure may flow back into the hose through the torch at a low pressure. This leads to dangerous mixing of gases in the hose, which may lead to damages such as severe explosion or fire. Backfire: This occurs when the flame enters into the torch or a nozzle with a violent sound, which may re-ignite or extinguish in the nozzle.
Backfire is only a momentary phenomenon, and it may not sustain for a long time. In most cases, the flame is reignited when a manual lighter is used or when there is an ignition source nearby.
Pipe Equipment. Electrode Ovens. Welding Helmets. Helmet Spares. Helmet Lenses. Specs, Goggles, Faceshields. Cable Cover. Oxy Kits. Oxy Accessories. Spare Parts. Flap Discs. Cutting Discs. Grinding Discs. Wire Brushes. Promotional Literature. Weld 2 WIN. The Supply-O-Meter The Inside Tack. By clicking sign up, you agree to receive emails from Safeopedia and agree to our Terms of Use and Privacy Policy. A flashback arrester is a mechanical device fitted to a gas welding pipe system that resists flame transmission from the nozzle back into the gas cylinder.
This function prevents the gas cylinders from accidentally exploding. Flashback arresters are used in gas welding pipes running from gas cylinders to the nozzles. There are two types of flashback arresters, namely, dry and wet. A dry flashback arrester works in three ways:. Stopping flame from passing towards the cylinder by a hollow cylindrical filter made of stainless steel.
Stopping the gas mixture from backward travel by a thermal cutoff valve integrated plastic seal. The wet type of flashback arrester is basically a liquid, usually water, barrier. It uses the principle of a siphon to stop and extinguish the flame. 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.
0コメント