The invention relates to a method for maintaining the temperature of fluid media in pipes even in the event of an interruption of the fluid media flow. In a first step, a heat reservoir layer (1) is produced comprising a
latent heat reservoir material (2) and a matrix material (3). In a second step, the heat reservoir layer (1) is either arranged around a
pipe (4) and subsequently encased with a heat damping material (5) or the heat reservoir layer (1) is brought into contact with heat damping material (5), whereby a heat reservoir
damper composite (51) is obtained, and the
pipe (4) is then encased with the heat reservoir
damper composite (51) such that the heat reservoir layer (1) of the heat reservoir
damper composite (51) lies between the
pipe (4) and the heat damping material (5) of the heat reservoir damping composite (51).