What corrosion properties can be expected?
These pipe systems are in use since about 15 years. Compared to conventionally insulated pipes it has been shown that the preinsulated pipe system shows obvious advantages in its long term behaviour. Corrosion bridges at the mounting and supporting clamps are avoided. Thus the advantages of the insulating technique become especially visible after a few years of line operation. Over time it can often be observed that the conventional insulation is damaged or partly dismantled due to deflexions of the carrier pipe or the mistreatment of the outer casing and the insulation. In such cases moisture can penetrate into the insulation which leads to corrosion at the carrier piping and to reduced insulation values. Long-term analysis has shown that such damages can lead to up to 30% loss in insulation efficiency. Those negative influences cannot be observed on preinsulated piping systems. Neither can any deflexion of the piping lead to dislocations for the insulation nor can the outer jacketing
