Field testing of deep water cathodic protection on the Norwegian Continental Shelf

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Mater. Performance; (United States)

OSTI ID:5287497

Fischer, K P; Sydberger, T; Lye, R

Field testing has been conducted on the Norwegian Continental Shelf (Tromsoflaket and Troll field) at depths down to 500 m, using automatic logging units for in situ monitoring of cathodic protection (CP) and environmental data. The main objective was to establish design data for the CP of future installation in these areas and at great water depths. Very high design current densities (CDs) were necessary to achieve rapid and efficient cathodic polarization at Tromsoflaket and Troll. The polarization behavior of steel cathodes and galvanic anodes has been related to seawater environmental parameters, DP design, and the characteristics of the calcareous layers formed. The results illustrate that a high initial design CD promotes the formation of dense calcareous layers, thereby reducing the long-term current consumption for maintenance of CP. Once such layers had formed, variations in seawater flow had very little effect on the cathodic CD. No incidences of cathodic depolarization related to erosion or spalling of calcareous layers were registered.

• Research Organization: Norwegian Marine Technology Research Institute A/S, P.O. Box 173, N-3201, Sandefjord (NO)
• OSTI ID: 5287497
• Journal Information: Mater. Performance; (United States), Journal Name: Mater. Performance; (United States) Vol. 27:1; ISSN MTPFB
• Country of Publication: United States
• Language: English

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