Detecting the pig easily and quickly in the pipeline is the basis for safe operation of a pigging system. The URESH pigging system is designed in such a way that the pig with the cast-in magnets is clearly indicated by a magnetic sensor even in double-walled pipelines (cooling or heating of the product). This is the only way to detect the pig in the pipeline accurately, while using the pig to control the flow of the product at the desired inputs and outputs like a valve in the pipeline. The URESH® pig can also be reliably detected in double-walled pipes. This is necessary wherever pipes have to be heated or cooled. The URESH® double pig system allows unrivalled flexibility for the requirements of the pharmaceutical and food industries.