Abstract: The invention relates to a conduit for the transport of liquid and/or gaseous media or suspensions, comprising at least one media pipe and at least one envelope. The media pipe is arranged so as to be axially displaceable inside the envelope or envelopes on sliding parts under formation of an air gap separating the envelope from the media pipe. The sliding parts are held at the joints of the individual elements of the envelope. They preferably extend by a radially outer segment between the elements of the envelope and form a support for the media pipe together with a radially inner segment. A single annular sliding part is preferably inserted in each joint of the elements of the envelope. In the case of an annular sliding part without a segment extending between the elements of the envelope, the part is conveniently pushed outward by self-tensioning due to the elasticity of its shape.