Abstract: A pipe arrangement for geothermal probes includes at least two pipes having at least one layer each that surrounds a lumen. One of the pipes functions as inflow pipe and the other pipe functions as return flow pipe. At least one of the pipes is produced at least in part from a non cross-linked polymer material and is distinguished in that the polymer material of the at least one layer for the pipes has a FNCT value (full notched creep test) according to ISO 16770 of at least 3000 hours.

Abstract: The invention relates to a tube or molded tube element for receiving, storing or guiding air, containing at least a percentage of a chlorine-containing polymer material, and further containing at least one biocidally active component. The invention is characterized in that the polymer material is stabilized by a composition which contains at least one calcium compound.

Abstract: The invention relates to a covering device, preferably for post-isolating the connection point of pipes, in particular district heating pipes. Said device comprises at least two cover shells (1, 2) which surround the pipes in the mounted state, and at least one connection means (3) for connecting the cover shells (1,2). The connection means (3) comprise at least one substantially hook-shaped engaging section (4) that is provided for a positive fit connection, at least in parts, having at least one maintaining section (5) enabling the covering shells to be braced against one another. A sealing element (14) is arranged between the covering device and a pipe, in the mounted state, and surrounds the pipe.

Abstract: A pipe arrangement for geothermal probes includes at least two pipes having at least one layer each that surrounds a lumen. One of the pipes functions as inflow pipe and the other pipe functions as return flow pipe. At least one of the pipes is produced at least in part from a non cross-linked polymer material and is distinguished in that the polymer material of the at least one layer for the pipes has a FNCT value (full notched creep test) according to ISO 16770 of at least 3000 hours.