What is the expansion and deflexion behaviour of these pipes?
1. Expansion With the exception of isolated cases at which the carrier pipe has a very low elasticity module as f. i. HDPE piping it can be said that the expansion behaviour of preinsulated pipes is equal to the one of the uninsulated carrier pipes. Normally the carrier pipe is the main factor for the elongation. The movements of the carrier pipe are forced on the other two components i.e. the PU foam and the jacketing. This has the advantage that all movements of the carrier pipe are directly transferred to the supporting clamps. The stability of the outer spiral piping and the compression strength of the PU foam are high enough to install the supporting clamps directly around the outer casing of the pipe. The subject of fixpoints needs separate considerations. 2. Deflexion The composit piping leads to a reinforced system. As already mentioned earlier it is the behaviour of the carrier pipe that is most influential. In regard to the deflexion behaviour of the system the three componen
