Method and system for clearing a pipe system

A system for clearing contents from a pipe system, the pipe system having a volume, a proximal end and a distal end, the system comprising:

• an air supply connected to the pipe system proximal end for supplying air to the pipe system at the proximal end, wherein an air pressure decreases from an initial pressure as a bulk of the pipe system contents get discharged gradually at the distal end for obtaining a contents flow in the pipe system;
• the system further comprising:
• volume determining means for determining an air volume supplied by the air supply;
• calculating means for determining an estimated contents travel speed from the volume of the air supplied to the pipe system and for correcting the estimated contents travel speed for content viscosity with a contents speed correction factor F for obtaining a corrected estimated contents travel speed;
• control means arranged for controlling the air supply to the proximal end of the pipe system for obtaining a predetermined pipe contents travel speed using the corrected estimated contents travel speed;
• position determining means configured and arranged for determining a position of an air-contents front in the pipe system based on a pressure at the proximal end thereof;
• wherein the control means are configured and arranged for preventing the air supply to the proximal end of the pipe system upon determining that the position of the air-contents front in the pipe system corresponds to a predetermined position in the pipe system relative to the distal end thereof, said predetermined position corresponding to a position at which a sufficient amount of the contents is cleared from the pipe system.