Modelling stray current interference to shipboard cathodic protection system

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Authors
  1. Wang, Y.
  2. KarisAllen, K.J.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN);FACTS Engineering Inc., Halifax, NS (CAN)
Abstract
Cathodic protection is commonly used for corrosion protection of the underwater hull structures of naval platforms. Cathodic protection works by establishing an electrostatic field that provides the desired potential and current distributions in the seawater surrounding the structures to be protected. Interference to a ship’s cathodic protection system may occur when the ship is alongside a jetty or another naval ship due to the influence of the electrostatic field associated with the cathodic protection system employed on the jetty or another naval ship. The interference may alter the electrostatic field surrounding the ship and, therefore, the level of corrosion protection to the ship hull. In the current study, a physical scale modelling (PSM) technique is used to evaluate how, and to what extent, the level of cathodic protection on a ship hull could be affected by an external current source. A 1/100 scale ship model with two-zone four-anode impressed current cathodic protection (ICCP) system is used in the study. The modelling results indicate that the presence of stray current may affect the potential distribution along the ship hull. The extent of stray current effect depends on a number of factors including the relative position and layout of stray current source, the magnitude and direction of the stray current flow, and the operating mode of the shipboard ICCP system.
Keywords
corrosion;stray current;cathodic protection;impressed current;seawater;ships;physical scale modeling
Report Number
DRDC-RDDC-2015-P204 — External Literature
Date of publication
20 Feb 2017
Number of Pages
15
DSTKIM No
CA044515
CANDIS No
805008
Format(s):
Electronic Document(PDF)

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