Pulse cathodic protection system

C - Chemistry – Metallurgy – 23 – F

Patent

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Details

C23F 13/04 (2006.01)

Patent

CA 2076741

A circuit and method of cathodically protecting ferrous metal structures such as pipelines or well casings is described disposed in a conductive medium such as the ground. A pair of terminals are connected to an anode spaced from the structure and to the structure. A source of d.c. voltage is periodically connected across the terminal to cause current to flow to the anode and provide electrons at the surface of the structure to inhibit ferrous molecules from going into solution and damaging the integrity of the structure. The current flow due to the induced emf caused by the reactive inductions of the anode/cathode system is limited to inhibit damage to neighboring ferrous structures by providing a high impedance, e.g. an open circuit, between the input terminals during all or part of the time that the d.c. source is not supplying current to the anode/cathode load.

Description d'un circuit et d'une méthode de protection cathodique des structures en métal ferreux comme des pipelines ou des tubages de puits placés dans un milieu conducteur comme le sol. Deux bornes sont reliées à la structure et à une anode éloignée de la structure. Une source de courant continu est périodiquement reliée à la borne pour que le courant aille vers l'anode et fournisse des électrons à la surface de la structure pour empêcher les molécules ferreuses de former une solution et d'endommager la structure. Le passage du courant en raison des fem induites qui sont provoquées par les inductions réactives du système anode/cathode est limité afin d'empêcher les dommages aux structures de métal ferreux avoisinantes en fournissant une grande impédance, c.-à-d., un circuit ouvert, entre les bornes d'entrée pendant une partie ou toute la période au cours de laquelle la source de courant continu ne fournit pas de courant à la charge anodique/cathodique.

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