A monitoring method for detecting an approximation of a conductive body to a cathodic protection flow applied fluid transport pipeline

摘要

In order to detect an approach of a conductive body to a loaded with a cathodic protection flow fluid transport pipeline (1), at predetermined times at least two measuring points (3) on the fluid transport pipeline (1) each one for the at the measuring point along the fluid Transporting pipeline flowing protection current representative Spannungsmeßwert (U1, U2) detected. For each given point in time, a protective current difference value representative of the difference of the protective currents flowing at the measuring points along the pipeline is formed from the voltage measuring values (U1, U2) of two spaced measuring points. From the temporal change of the protective current difference values formed for the given times then at least one value is derived, which can indicate an approach of a conductive body to the fluid transport pipeline (1) between the two measuring points (3). With the monitoring method according to the invention in particular sudden damage to the fluid transport pipeline can be reliably detected. Since the cathodic protection current does not have to be modulated for the method according to the invention, the method according to the invention can be implemented without special technical effort and cost-effectively.