Corrosion is a chemical and electrochemical reaction of a metal with its environment, causing its damage. It occurs at different speeds, which can be reduced. From a practical point of view, anti-corrosion cathodic protection of metals is of interest

In heating networks, gland, U-shaped and bellows (wavy) expansion joints are widely used. Compensators must have sufficient compensating capacity to accommodate the thermal elongation of the pipeline section between the fixed supports,