09521 Cathodic Protection in Cold Seawater – Current Density Requirement

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Product Number: 51300-09521-SG

ISBN: 09521 2009 CP

Author: Roy Johnsen and Helga Wiik Stangeland

Publication Date: 2009

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Cathodic protection combined with organic coating is the normal way to protect structures exposed to seawater against corrosion. The oil and gas industry is moving to deeper waters with pipelines and production systems located on the sea bottom, often far away from shore. Seawater temperature down to -10C is occurring in these deep waters. This paper presents results from carbon steel specimens polarized in the range -800 - -1100 mV SCE in natural seawater at temperature 00C for periods up to 8 weeks. Results from short term exposure of specimens at 70C are also included for comparison. Current density values will be presented. In addition the composition of calcareous deposits on the surface will be described.

Keywords: Cathodic protection, cold seawater, current density, calcareous deposit, arctic regions

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09520 Effect of Calcareous Deposit Formation on Galvanic Anode Cathodic Protection of Steel in Seawater

Product Number: 51300-09520-SG

ISBN: 09520 2009 CP

Author: Julissa L. Solis-Romero and Juan Genesca

Publication Date: 2009

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How calcareous deposits formation in seawater influences the performance of a galvanic cathodic protection (CP) system in seawater. Coupling current measured. A resistance set between the cathode and the anode simulated circuit resistance of CP. Steel cathode potential over immersion time. Calcareous deposits analyzed by X-Ray Diffraction.

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Strategy and Results of an Impressed Current Cathodic Protecton Retrofit in the North Sea

Product Number: 51317--8957-SG

ISBN: 8957 2017 CP

Author: Alex Delwiche

Publication Date: 2017

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This paper discusses the design process and challenges in choosing what was at the time, the largest ever cathodic protection retrofit in terms of delivered current capacity offshore, and the actual current the structure required to maintain protection.