Strike back (flame)
The sudden cessation of gas supply to a gas burner can through the failing pressure cause air and the flame is recirculated in the feeding gas lines and thus in the supply network, so that an explosion can be caused in the supply line. This can be prevented by built-in check valves as a precaution .
In the case of a gas burner (Bunsen burner or similar) one understands by " kick back ", a combustion directly at the nozzle (around the foot) and not only at the upper end of the mixing section, i.e. the burner tube, where the combustion normally takes place. As a result, unburned gases (odorized for safety reasons, i.e. with an unpleasant smell) escape from the burner tube. At the same time, the burner tube becomes hot. The cause of the "kickback" is a sudden strong external draft or an excessive supply of air into the mixing section of the burner. After a burner has kicked back , close the gas supply tap, then the air supply and ignite the burner again as usual.
Individual evidence
- ^ Walter Wittenberger: Chemische Laboratoriumstechnik , Springer-Verlag, Vienna, New York, 7th edition, 1973, p. 143, ISBN 3-211-81116-8 .