The present invention relates to a heat exchanger pipe system for transporting viscous fluids, comprising a plurality of individual heat exchangers designed as pipe elements and having a predefined control temperature and/or pressure distribution along the pipe system and in the cross-section of the pipes. The invention in characterized in that heat exchangers which are in the form of pipe elements are arranged at regular distances in the pipe system. The regular distances are selected in such a manner that a predetermined temperature and/or pressure distribution is maintained along the pipe system, tempering means of a viscous fluid transported in the heat exchanger pipe are arranged in the heat exchangers and optional mixing elements which are used to maintain, in accordance with the pipe cross-section, a predetermined temperature and pressure distribution in the cross section of the pipes, and at least 30% of the length of the heat exchanger pipe system is equipped with heat exchangers. The invention also relates to a method for transporting viscous fluids by means of heat exchanger pipes.