Pre-insulated piping for temperatures up to 145°C is offered as bonded pipe system, which means that service pipe, insulation and jacket pipe are one unit and PUR foam transfers the stress between them. The piping can be installed underground - protected in HDPE jacket, or aboveground - protected in SPIRO jacket. Bonded system moves as one unit and these movements are restricted by soil friction. Dilatation is solved using compensators or elbows.
Above ground application: