text: In thermal tube cleaning the layer or deposit is dried through a heating whereby it flakes off due to its embrittlement and is then discharged, either by the conveying medium or a rinsing liquid. Depending on the required temperature, the heating can be either a parallel tube heating or an induction heating. This process is an off-line process. Occasionally it is also used for the sterilization of tubes in the pharmaceutical or food industry. A diameter range cannot be indicated here because this method can be applied for certain processes only; a technical limitation of the heating is given only by the materials and the required amount of heat.