Oxygen Lancing Steel Pipe

Oxygen lancing steel pipe is a cutting process which uses oxygen supplied through a consumable steel pipe to pierce holes in metallic and mineral work pieces. The lance is lighted and steadily consumed. It involves a number of steel wires packed into the steel tube. The process is based on the principle that the iron pipe burns at approx. 1200 to 2700 °C dependent on the burning iron-to-oxygen ratio. The proper ratio is decisive, and is obtained with the special tube, where ten to twelve steel wires are e.g. packed into a 3/8" (17.2 x 2 dia.) lance. Available tubes are typically 3 and 6 m long, and 1/2", 3/8", and 1/4" in diameter. A brass clamp and dosing valve hold the steel pipe and provide the required oxygen flow. A fuel gas is not required for the process itself, it may, however, be used in a welding torch to heat the cutting end of the lance to ignition temperature.

Oxygen lancing steel pipe the most important factor for process economy is a proper oxygen-to-lance material ratio, and this metal-to-oxygen factor shall not below 0.5. Excessive oxygen would 'holdfast' the burning lance, which never must happen. The optimum factor is obtained by using steel wires in the lance tube. They excel profiled inserts in two ways: They offer a large surface to the oxygen, and they provide sufficient sectional area for oxygen flow in cases where the lance is bent. Maximum piercing results, at minimum lance consumption, lowest oxygen consumption, and longest burning duration, can be expected at a sectional area ratio for Tube to wire to oxygen of 1.2: 1: 0.7.

Extensive investigations in theory and practice have proven that oxygen lancing is an efficient process for concrete and steel piercing. Especially for demolishing work it has captured a permanent share. It will open up further ranges of application, not least because of its environmental acceptability. Oxygen lancing can be used to pierce virtually all minerals and ferrous metals, every time and everywhere. Mobile use and ecological benefits are decisive advantages over competing processes. More recently, oxygen lance cutting has also been used underwater. This is a promising application in offshore technology.

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